├── .gitignore ├── LICENSE.md ├── README.md ├── WhenWillItExitInt-bytecode-comparison ├── eclipse │ └── safepoint │ │ └── hang │ │ ├── WhenWillItExitInt.bytecode │ │ ├── WhenWillItExitInt.class │ │ ├── WhenWillItExitInt1.bytecode │ │ ├── WhenWillItExitInt1.class │ │ ├── WhenWillItExitInt2.bytecode │ │ └── WhenWillItExitInt2.class └── javac │ └── safepoint │ └── hang │ ├── WhenWillItExitInt.bytecode │ ├── WhenWillItExitInt.class │ ├── WhenWillItExitInt1.bytecode │ ├── WhenWillItExitInt1.class │ ├── WhenWillItExitInt2.bytecode │ └── WhenWillItExitInt2.class ├── pom.xml └── src └── main └── java └── safepoint ├── fair ├── LoveAtATimeOfSafepoints.java ├── SafepointUsingFindDeadlocks.java ├── SafepointUsingGc.java ├── SafepointUsingThreadGetInfo.java └── SafepointUsingThreadsDump.java ├── hang ├── WhenWillItExitInt.java ├── WhenWillItExitInt1.java ├── WhenWillItExitInt2.java ├── WhenWillItExitInt3.java ├── WhenWillItExitIntInfinite.java └── WhenWillItExitLong.java ├── optimizations └── SafepointKillLoopOptimizations.java └── profiling └── SafepointProfiling.java /.gitignore: -------------------------------------------------------------------------------- 1 | # Package Files # 2 | *.jar 3 | *.war 4 | *.ear 5 | 6 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 7 | hs_err_pid* 8 | /bin/ 9 | /target/ 10 | /.classpath 11 | /.project 12 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | CC0 1.0 Universal 2 | 3 | Statement of Purpose 4 | 5 | The laws of most jurisdictions throughout the world automatically confer 6 | exclusive Copyright and Related Rights (defined below) upon the creator and 7 | subsequent owner(s) (each and all, an "owner") of an original work of 8 | authorship and/or a database (each, a "Work"). 9 | 10 | Certain owners wish to permanently relinquish those rights to a Work for the 11 | purpose of contributing to a commons of creative, cultural and scientific 12 | works ("Commons") that the public can reliably and without fear of later 13 | claims of infringement build upon, modify, incorporate in other works, reuse 14 | and redistribute as freely as possible in any form whatsoever and for any 15 | purposes, including without limitation commercial purposes. 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Affirmer understands and acknowledges that Creative Commons is not a 112 | party to this document and has no duty or obligation with respect to this 113 | CC0 or use of the Work. 114 | 115 | For more information, please see 116 | 117 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # safepoint-experiments 2 | Supporting code for Safepoints blog post 3 | -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt.bytecode: -------------------------------------------------------------------------------- 1 | Classfile /home/yak/git/safepoint-experiments/WhenWillItExitInt-bytecode-comparison/WhenWillItExitInt.class 2 | Last modified 23 Jan 2016; size 1717 bytes 3 | MD5 checksum 41fa6f283e7727f2e24829b4b5607661 4 | Compiled from "WhenWillItExitInt.java" 5 | public class safepoint.hang.WhenWillItExitInt 6 | minor version: 0 7 | major version: 52 8 | flags: ACC_PUBLIC, ACC_SUPER 9 | Constant pool: 10 | #1 = Class #2 // safepoint/hang/WhenWillItExitInt 11 | #2 = Utf8 safepoint/hang/WhenWillItExitInt 12 | #3 = Class #4 // java/lang/Object 13 | #4 = Utf8 java/lang/Object 14 | #5 = Utf8 15 | #6 = Utf8 ()V 16 | #7 = Utf8 Code 17 | #8 = Methodref #3.#9 // java/lang/Object."":()V 18 | #9 = NameAndType #5:#6 // "":()V 19 | #10 = Utf8 LineNumberTable 20 | #11 = Utf8 LocalVariableTable 21 | #12 = Utf8 this 22 | #13 = Utf8 Lsafepoint/hang/WhenWillItExitInt; 23 | #14 = Utf8 main 24 | #15 = Utf8 ([Ljava/lang/String;)V 25 | #16 = Utf8 Exceptions 26 | #17 = Class #18 // java/lang/InterruptedException 27 | #18 = Utf8 java/lang/InterruptedException 28 | #19 = Class #20 // java/lang/Thread 29 | #20 = Utf8 java/lang/Thread 30 | #21 = NameAndType #22:#23 // run:()Ljava/lang/Runnable; 31 | #22 = Utf8 run 32 | #23 = Utf8 ()Ljava/lang/Runnable; 33 | #24 = InvokeDynamic #0:#21 // #0:run:()Ljava/lang/Runnable; 34 | #25 = Methodref #19.#26 // java/lang/Thread."":(Ljava/lang/Runnable;)V 35 | #26 = NameAndType #5:#27 // "":(Ljava/lang/Runnable;)V 36 | #27 = Utf8 (Ljava/lang/Runnable;)V 37 | #28 = Methodref #19.#29 // java/lang/Thread.setDaemon:(Z)V 38 | #29 = NameAndType #30:#31 // setDaemon:(Z)V 39 | #30 = Utf8 setDaemon 40 | #31 = Utf8 (Z)V 41 | #32 = Methodref #19.#33 // java/lang/Thread.start:()V 42 | #33 = NameAndType #34:#6 // start:()V 43 | #34 = Utf8 start 44 | #35 = Long 5000l 45 | #37 = Methodref #19.#38 // java/lang/Thread.sleep:(J)V 46 | #38 = NameAndType #39:#40 // sleep:(J)V 47 | #39 = Utf8 sleep 48 | #40 = Utf8 (J)V 49 | #41 = Utf8 argc 50 | #42 = Utf8 [Ljava/lang/String; 51 | #43 = Utf8 t 52 | #44 = Utf8 Ljava/lang/Thread; 53 | #45 = Utf8 lambda$0 54 | #46 = Integer 2147483647 55 | #47 = Fieldref #48.#50 // java/lang/System.out:Ljava/io/PrintStream; 56 | #48 = Class #49 // java/lang/System 57 | #49 = Utf8 java/lang/System 58 | #50 = NameAndType #51:#52 // out:Ljava/io/PrintStream; 59 | #51 = Utf8 out 60 | #52 = Utf8 Ljava/io/PrintStream; 61 | #53 = Class #54 // java/lang/StringBuilder 62 | #54 = Utf8 java/lang/StringBuilder 63 | #55 = String #56 // How Odd: 64 | #56 = Utf8 How Odd: 65 | #57 = Methodref #53.#58 // java/lang/StringBuilder."":(Ljava/lang/String;)V 66 | #58 = NameAndType #5:#59 // "":(Ljava/lang/String;)V 67 | #59 = Utf8 (Ljava/lang/String;)V 68 | #60 = Methodref #53.#61 // java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 69 | #61 = NameAndType #62:#63 // append:(J)Ljava/lang/StringBuilder; 70 | #62 = Utf8 append 71 | #63 = Utf8 (J)Ljava/lang/StringBuilder; 72 | #64 = Methodref #53.#65 // java/lang/StringBuilder.toString:()Ljava/lang/String; 73 | #65 = NameAndType #66:#67 // toString:()Ljava/lang/String; 74 | #66 = Utf8 toString 75 | #67 = Utf8 ()Ljava/lang/String; 76 | #68 = Methodref #69.#71 // java/io/PrintStream.println:(Ljava/lang/String;)V 77 | #69 = Class #70 // java/io/PrintStream 78 | #70 = Utf8 java/io/PrintStream 79 | #71 = NameAndType #72:#59 // println:(Ljava/lang/String;)V 80 | #72 = Utf8 println 81 | #73 = Utf8 l 82 | #74 = Utf8 J 83 | #75 = Utf8 i 84 | #76 = Utf8 I 85 | #77 = Utf8 j 86 | #78 = Utf8 StackMapTable 87 | #79 = Utf8 SourceFile 88 | #80 = Utf8 WhenWillItExitInt.java 89 | #81 = Utf8 BootstrapMethods 90 | #82 = Methodref #83.#85 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 91 | #83 = Class #84 // java/lang/invoke/LambdaMetafactory 92 | #84 = Utf8 java/lang/invoke/LambdaMetafactory 93 | #85 = NameAndType #86:#87 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 94 | #86 = Utf8 metafactory 95 | #87 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 96 | #88 = MethodHandle #6:#82 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 97 | #89 = MethodType #6 // ()V 98 | #90 = Methodref #1.#91 // safepoint/hang/WhenWillItExitInt.lambda$0:()V 99 | #91 = NameAndType #45:#6 // lambda$0:()V 100 | #92 = MethodHandle #6:#90 // invokestatic safepoint/hang/WhenWillItExitInt.lambda$0:()V 101 | #93 = MethodType #6 // ()V 102 | #94 = Utf8 InnerClasses 103 | #95 = Class #96 // java/lang/invoke/MethodHandles$Lookup 104 | #96 = Utf8 java/lang/invoke/MethodHandles$Lookup 105 | #97 = Class #98 // java/lang/invoke/MethodHandles 106 | #98 = Utf8 java/lang/invoke/MethodHandles 107 | #99 = Utf8 Lookup 108 | { 109 | public safepoint.hang.WhenWillItExitInt(); 110 | descriptor: ()V 111 | flags: ACC_PUBLIC 112 | Code: 113 | stack=1, locals=1, args_size=1 114 | 0: aload_0 115 | 1: invokespecial #8 // Method java/lang/Object."":()V 116 | 4: return 117 | LineNumberTable: 118 | line 2: 0 119 | LocalVariableTable: 120 | Start Length Slot Name Signature 121 | 0 5 0 this Lsafepoint/hang/WhenWillItExitInt; 122 | 123 | public static void main(java.lang.String[]) throws java.lang.InterruptedException; 124 | descriptor: ([Ljava/lang/String;)V 125 | flags: ACC_PUBLIC, ACC_STATIC 126 | Exceptions: 127 | throws java.lang.InterruptedException 128 | Code: 129 | stack=3, locals=2, args_size=1 130 | 0: new #19 // class java/lang/Thread 131 | 3: dup 132 | 4: invokedynamic #24, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable; 133 | 9: invokespecial #25 // Method java/lang/Thread."":(Ljava/lang/Runnable;)V 134 | 12: astore_1 135 | 13: aload_1 136 | 14: iconst_1 137 | 15: invokevirtual #28 // Method java/lang/Thread.setDaemon:(Z)V 138 | 18: aload_1 139 | 19: invokevirtual #32 // Method java/lang/Thread.start:()V 140 | 22: ldc2_w #35 // long 5000l 141 | 25: invokestatic #37 // Method java/lang/Thread.sleep:(J)V 142 | 28: return 143 | LineNumberTable: 144 | line 4: 0 145 | line 14: 13 146 | line 15: 18 147 | line 16: 22 148 | line 17: 28 149 | LocalVariableTable: 150 | Start Length Slot Name Signature 151 | 0 29 0 argc [Ljava/lang/String; 152 | 13 16 1 t Ljava/lang/Thread; 153 | 154 | private static void lambda$0(); 155 | descriptor: ()V 156 | flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC 157 | Code: 158 | stack=4, locals=4, args_size=0 159 | 0: lconst_0 160 | 1: lstore_0 161 | 2: iconst_0 162 | 3: istore_2 163 | 4: goto 35 164 | 7: iconst_0 165 | 8: istore_3 166 | 9: goto 26 167 | 12: iload_3 168 | 13: iconst_1 169 | 14: iand 170 | 15: iconst_1 171 | 16: if_icmpne 23 172 | 19: lload_0 173 | 20: lconst_1 174 | 21: ladd 175 | 22: lstore_0 176 | 23: iinc 3, 1 177 | 26: iload_3 178 | 27: ldc #46 // int 2147483647 179 | 29: if_icmplt 12 180 | 32: iinc 2, 1 181 | 35: iload_2 182 | 36: ldc #46 // int 2147483647 183 | 38: if_icmplt 7 184 | 41: getstatic #47 // Field java/lang/System.out:Ljava/io/PrintStream; 185 | 44: new #53 // class java/lang/StringBuilder 186 | 47: dup 187 | 48: ldc #55 // String How Odd: 188 | 50: invokespecial #57 // Method java/lang/StringBuilder."":(Ljava/lang/String;)V 189 | 53: lload_0 190 | 54: invokevirtual #60 // Method java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 191 | 57: invokevirtual #64 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 192 | 60: invokevirtual #68 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 193 | 63: return 194 | LineNumberTable: 195 | line 5: 0 196 | line 6: 2 197 | line 7: 7 198 | line 8: 12 199 | line 9: 19 200 | line 7: 23 201 | line 6: 32 202 | line 12: 41 203 | line 13: 63 204 | LocalVariableTable: 205 | Start Length Slot Name Signature 206 | 2 61 0 l J 207 | 4 37 2 i I 208 | 9 23 3 j I 209 | StackMapTable: number_of_entries = 5 210 | frame_type = 253 /* append */ 211 | offset_delta = 7 212 | locals = [ long, int ] 213 | frame_type = 252 /* append */ 214 | offset_delta = 4 215 | locals = [ int ] 216 | frame_type = 10 /* same */ 217 | frame_type = 2 /* same */ 218 | frame_type = 250 /* chop */ 219 | offset_delta = 8 220 | } 221 | SourceFile: "WhenWillItExitInt.java" 222 | BootstrapMethods: 223 | 0: #88 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 224 | Method arguments: 225 | #89 ()V 226 | #92 invokestatic safepoint/hang/WhenWillItExitInt.lambda$0:()V 227 | #93 ()V 228 | InnerClasses: 229 | public static final #99= #95 of #97; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles 230 | -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nitsanw/safepoint-experiments/a828993eda77e10b8115fb76da835098e39a34fd/WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt.class -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt1.bytecode: -------------------------------------------------------------------------------- 1 | Classfile /home/yak/git/safepoint-experiments/WhenWillItExitInt-bytecode-comparison/WhenWillItExitInt1.eclipse.class 2 | Last modified 23 Jan 2016; size 1814 bytes 3 | MD5 checksum a70a0aa4124674e843c5a6e58ad64311 4 | Compiled from "WhenWillItExitInt1.java" 5 | public class safepoint.hang.WhenWillItExitInt1 6 | minor version: 0 7 | major version: 52 8 | flags: ACC_PUBLIC, ACC_SUPER 9 | Constant pool: 10 | #1 = Class #2 // safepoint/hang/WhenWillItExitInt1 11 | #2 = Utf8 safepoint/hang/WhenWillItExitInt1 12 | #3 = Class #4 // java/lang/Object 13 | #4 = Utf8 java/lang/Object 14 | #5 = Utf8 15 | #6 = Utf8 ()V 16 | #7 = Utf8 Code 17 | #8 = Methodref #3.#9 // java/lang/Object."":()V 18 | #9 = NameAndType #5:#6 // "":()V 19 | #10 = Utf8 LineNumberTable 20 | #11 = Utf8 LocalVariableTable 21 | #12 = Utf8 this 22 | #13 = Utf8 Lsafepoint/hang/WhenWillItExitInt1; 23 | #14 = Utf8 main 24 | #15 = Utf8 ([Ljava/lang/String;)V 25 | #16 = Utf8 Exceptions 26 | #17 = Class #18 // java/lang/InterruptedException 27 | #18 = Utf8 java/lang/InterruptedException 28 | #19 = Class #20 // java/lang/Thread 29 | #20 = Utf8 java/lang/Thread 30 | #21 = NameAndType #22:#23 // run:()Ljava/lang/Runnable; 31 | #22 = Utf8 run 32 | #23 = Utf8 ()Ljava/lang/Runnable; 33 | #24 = InvokeDynamic #0:#21 // #0:run:()Ljava/lang/Runnable; 34 | #25 = Methodref #19.#26 // java/lang/Thread."":(Ljava/lang/Runnable;)V 35 | #26 = NameAndType #5:#27 // "":(Ljava/lang/Runnable;)V 36 | #27 = Utf8 (Ljava/lang/Runnable;)V 37 | #28 = Methodref #19.#29 // java/lang/Thread.setDaemon:(Z)V 38 | #29 = NameAndType #30:#31 // setDaemon:(Z)V 39 | #30 = Utf8 setDaemon 40 | #31 = Utf8 (Z)V 41 | #32 = Methodref #19.#33 // java/lang/Thread.start:()V 42 | #33 = NameAndType #34:#6 // start:()V 43 | #34 = Utf8 start 44 | #35 = Long 5000l 45 | #37 = Methodref #19.#38 // java/lang/Thread.sleep:(J)V 46 | #38 = NameAndType #39:#40 // sleep:(J)V 47 | #39 = Utf8 sleep 48 | #40 = Utf8 (J)V 49 | #41 = Utf8 argc 50 | #42 = Utf8 [Ljava/lang/String; 51 | #43 = Utf8 t 52 | #44 = Utf8 Ljava/lang/Thread; 53 | #45 = Utf8 countOdds 54 | #46 = Utf8 ()J 55 | #47 = Integer 2147483647 56 | #48 = Utf8 l 57 | #49 = Utf8 J 58 | #50 = Utf8 i 59 | #51 = Utf8 I 60 | #52 = Utf8 j 61 | #53 = Utf8 StackMapTable 62 | #54 = Utf8 lambda$0 63 | #55 = Methodref #1.#56 // safepoint/hang/WhenWillItExitInt1.countOdds:()J 64 | #56 = NameAndType #45:#46 // countOdds:()J 65 | #57 = Fieldref #58.#60 // java/lang/System.out:Ljava/io/PrintStream; 66 | #58 = Class #59 // java/lang/System 67 | #59 = Utf8 java/lang/System 68 | #60 = NameAndType #61:#62 // out:Ljava/io/PrintStream; 69 | #61 = Utf8 out 70 | #62 = Utf8 Ljava/io/PrintStream; 71 | #63 = Class #64 // java/lang/StringBuilder 72 | #64 = Utf8 java/lang/StringBuilder 73 | #65 = String #66 // How Odd: 74 | #66 = Utf8 How Odd: 75 | #67 = Methodref #63.#68 // java/lang/StringBuilder."":(Ljava/lang/String;)V 76 | #68 = NameAndType #5:#69 // "":(Ljava/lang/String;)V 77 | #69 = Utf8 (Ljava/lang/String;)V 78 | #70 = Methodref #63.#71 // java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 79 | #71 = NameAndType #72:#73 // append:(J)Ljava/lang/StringBuilder; 80 | #72 = Utf8 append 81 | #73 = Utf8 (J)Ljava/lang/StringBuilder; 82 | #74 = Methodref #63.#75 // java/lang/StringBuilder.toString:()Ljava/lang/String; 83 | #75 = NameAndType #76:#77 // toString:()Ljava/lang/String; 84 | #76 = Utf8 toString 85 | #77 = Utf8 ()Ljava/lang/String; 86 | #78 = Methodref #79.#81 // java/io/PrintStream.println:(Ljava/lang/String;)V 87 | #79 = Class #80 // java/io/PrintStream 88 | #80 = Utf8 java/io/PrintStream 89 | #81 = NameAndType #82:#69 // println:(Ljava/lang/String;)V 90 | #82 = Utf8 println 91 | #83 = Utf8 SourceFile 92 | #84 = Utf8 WhenWillItExitInt1.java 93 | #85 = Utf8 BootstrapMethods 94 | #86 = Methodref #87.#89 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 95 | #87 = Class #88 // java/lang/invoke/LambdaMetafactory 96 | #88 = Utf8 java/lang/invoke/LambdaMetafactory 97 | #89 = NameAndType #90:#91 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 98 | #90 = Utf8 metafactory 99 | #91 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 100 | #92 = MethodHandle #6:#86 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 101 | #93 = MethodType #6 // ()V 102 | #94 = Methodref #1.#95 // safepoint/hang/WhenWillItExitInt1.lambda$0:()V 103 | #95 = NameAndType #54:#6 // lambda$0:()V 104 | #96 = MethodHandle #6:#94 // invokestatic safepoint/hang/WhenWillItExitInt1.lambda$0:()V 105 | #97 = MethodType #6 // ()V 106 | #98 = Utf8 InnerClasses 107 | #99 = Class #100 // java/lang/invoke/MethodHandles$Lookup 108 | #100 = Utf8 java/lang/invoke/MethodHandles$Lookup 109 | #101 = Class #102 // java/lang/invoke/MethodHandles 110 | #102 = Utf8 java/lang/invoke/MethodHandles 111 | #103 = Utf8 Lookup 112 | { 113 | public safepoint.hang.WhenWillItExitInt1(); 114 | descriptor: ()V 115 | flags: ACC_PUBLIC 116 | Code: 117 | stack=1, locals=1, args_size=1 118 | 0: aload_0 119 | 1: invokespecial #8 // Method java/lang/Object."":()V 120 | 4: return 121 | LineNumberTable: 122 | line 2: 0 123 | LocalVariableTable: 124 | Start Length Slot Name Signature 125 | 0 5 0 this Lsafepoint/hang/WhenWillItExitInt1; 126 | 127 | public static void main(java.lang.String[]) throws java.lang.InterruptedException; 128 | descriptor: ([Ljava/lang/String;)V 129 | flags: ACC_PUBLIC, ACC_STATIC 130 | Exceptions: 131 | throws java.lang.InterruptedException 132 | Code: 133 | stack=3, locals=2, args_size=1 134 | 0: new #19 // class java/lang/Thread 135 | 3: dup 136 | 4: invokedynamic #24, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable; 137 | 9: invokespecial #25 // Method java/lang/Thread."":(Ljava/lang/Runnable;)V 138 | 12: astore_1 139 | 13: aload_1 140 | 14: iconst_1 141 | 15: invokevirtual #28 // Method java/lang/Thread.setDaemon:(Z)V 142 | 18: aload_1 143 | 19: invokevirtual #32 // Method java/lang/Thread.start:()V 144 | 22: ldc2_w #35 // long 5000l 145 | 25: invokestatic #37 // Method java/lang/Thread.sleep:(J)V 146 | 28: return 147 | LineNumberTable: 148 | line 4: 0 149 | line 8: 13 150 | line 9: 18 151 | line 10: 22 152 | line 11: 28 153 | LocalVariableTable: 154 | Start Length Slot Name Signature 155 | 0 29 0 argc [Ljava/lang/String; 156 | 13 16 1 t Ljava/lang/Thread; 157 | 158 | private static long countOdds(); 159 | descriptor: ()J 160 | flags: ACC_PRIVATE, ACC_STATIC 161 | Code: 162 | stack=4, locals=4, args_size=0 163 | 0: lconst_0 164 | 1: lstore_0 165 | 2: iconst_0 166 | 3: istore_2 167 | 4: goto 35 168 | 7: iconst_0 169 | 8: istore_3 170 | 9: goto 26 171 | 12: iload_3 172 | 13: iconst_1 173 | 14: iand 174 | 15: iconst_1 175 | 16: if_icmpne 23 176 | 19: lload_0 177 | 20: lconst_1 178 | 21: ladd 179 | 22: lstore_0 180 | 23: iinc 3, 1 181 | 26: iload_3 182 | 27: ldc #47 // int 2147483647 183 | 29: if_icmplt 12 184 | 32: iinc 2, 1 185 | 35: iload_2 186 | 36: ldc #47 // int 2147483647 187 | 38: if_icmplt 7 188 | 41: lload_0 189 | 42: lreturn 190 | LineNumberTable: 191 | line 14: 0 192 | line 15: 2 193 | line 16: 7 194 | line 17: 12 195 | line 18: 19 196 | line 16: 23 197 | line 15: 32 198 | line 21: 41 199 | LocalVariableTable: 200 | Start Length Slot Name Signature 201 | 2 41 0 l J 202 | 4 37 2 i I 203 | 9 23 3 j I 204 | StackMapTable: number_of_entries = 5 205 | frame_type = 253 /* append */ 206 | offset_delta = 7 207 | locals = [ long, int ] 208 | frame_type = 252 /* append */ 209 | offset_delta = 4 210 | locals = [ int ] 211 | frame_type = 10 /* same */ 212 | frame_type = 2 /* same */ 213 | frame_type = 250 /* chop */ 214 | offset_delta = 8 215 | 216 | private static void lambda$0(); 217 | descriptor: ()V 218 | flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC 219 | Code: 220 | stack=4, locals=2, args_size=0 221 | 0: invokestatic #55 // Method countOdds:()J 222 | 3: lstore_0 223 | 4: getstatic #57 // Field java/lang/System.out:Ljava/io/PrintStream; 224 | 7: new #63 // class java/lang/StringBuilder 225 | 10: dup 226 | 11: ldc #65 // String How Odd: 227 | 13: invokespecial #67 // Method java/lang/StringBuilder."":(Ljava/lang/String;)V 228 | 16: lload_0 229 | 17: invokevirtual #70 // Method java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 230 | 20: invokevirtual #74 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 231 | 23: invokevirtual #78 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 232 | 26: return 233 | LineNumberTable: 234 | line 5: 0 235 | line 6: 4 236 | line 7: 26 237 | LocalVariableTable: 238 | Start Length Slot Name Signature 239 | 4 22 0 l J 240 | } 241 | SourceFile: "WhenWillItExitInt1.java" 242 | BootstrapMethods: 243 | 0: #92 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 244 | Method arguments: 245 | #93 ()V 246 | #96 invokestatic safepoint/hang/WhenWillItExitInt1.lambda$0:()V 247 | #97 ()V 248 | InnerClasses: 249 | public static final #103= #99 of #101; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles 250 | -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt1.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nitsanw/safepoint-experiments/a828993eda77e10b8115fb76da835098e39a34fd/WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt1.class -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt2.bytecode: -------------------------------------------------------------------------------- 1 | Classfile /home/yak/git/safepoint-experiments/WhenWillItExitInt-bytecode-comparison/WhenWillItExitInt2.eclipse.class 2 | Last modified 23 Jan 2016; size 1836 bytes 3 | MD5 checksum f4cc8f00220bb861dde363084cbbb439 4 | Compiled from "WhenWillItExitInt2.java" 5 | public class safepoint.hang.WhenWillItExitInt2 6 | minor version: 0 7 | major version: 52 8 | flags: ACC_PUBLIC, ACC_SUPER 9 | Constant pool: 10 | #1 = Class #2 // safepoint/hang/WhenWillItExitInt2 11 | #2 = Utf8 safepoint/hang/WhenWillItExitInt2 12 | #3 = Class #4 // java/lang/Object 13 | #4 = Utf8 java/lang/Object 14 | #5 = Utf8 15 | #6 = Utf8 ()V 16 | #7 = Utf8 Code 17 | #8 = Methodref #3.#9 // java/lang/Object."":()V 18 | #9 = NameAndType #5:#6 // "":()V 19 | #10 = Utf8 LineNumberTable 20 | #11 = Utf8 LocalVariableTable 21 | #12 = Utf8 this 22 | #13 = Utf8 Lsafepoint/hang/WhenWillItExitInt2; 23 | #14 = Utf8 main 24 | #15 = Utf8 ([Ljava/lang/String;)V 25 | #16 = Utf8 Exceptions 26 | #17 = Class #18 // java/lang/InterruptedException 27 | #18 = Utf8 java/lang/InterruptedException 28 | #19 = Class #20 // java/lang/Thread 29 | #20 = Utf8 java/lang/Thread 30 | #21 = NameAndType #22:#23 // run:()Ljava/lang/Runnable; 31 | #22 = Utf8 run 32 | #23 = Utf8 ()Ljava/lang/Runnable; 33 | #24 = InvokeDynamic #0:#21 // #0:run:()Ljava/lang/Runnable; 34 | #25 = Methodref #19.#26 // java/lang/Thread."":(Ljava/lang/Runnable;)V 35 | #26 = NameAndType #5:#27 // "":(Ljava/lang/Runnable;)V 36 | #27 = Utf8 (Ljava/lang/Runnable;)V 37 | #28 = Methodref #19.#29 // java/lang/Thread.setDaemon:(Z)V 38 | #29 = NameAndType #30:#31 // setDaemon:(Z)V 39 | #30 = Utf8 setDaemon 40 | #31 = Utf8 (Z)V 41 | #32 = Methodref #19.#33 // java/lang/Thread.start:()V 42 | #33 = NameAndType #34:#6 // start:()V 43 | #34 = Utf8 start 44 | #35 = Long 5000l 45 | #37 = Methodref #19.#38 // java/lang/Thread.sleep:(J)V 46 | #38 = NameAndType #39:#40 // sleep:(J)V 47 | #39 = Utf8 sleep 48 | #40 = Utf8 (J)V 49 | #41 = Utf8 argc 50 | #42 = Utf8 [Ljava/lang/String; 51 | #43 = Utf8 t 52 | #44 = Utf8 Ljava/lang/Thread; 53 | #45 = Utf8 countOdds 54 | #46 = Utf8 (I)J 55 | #47 = Utf8 limit 56 | #48 = Utf8 I 57 | #49 = Utf8 l 58 | #50 = Utf8 J 59 | #51 = Utf8 i 60 | #52 = Utf8 j 61 | #53 = Utf8 StackMapTable 62 | #54 = Utf8 lambda$0 63 | #55 = Integer 2147483647 64 | #56 = Methodref #1.#57 // safepoint/hang/WhenWillItExitInt2.countOdds:(I)J 65 | #57 = NameAndType #45:#46 // countOdds:(I)J 66 | #58 = Fieldref #59.#61 // java/lang/System.out:Ljava/io/PrintStream; 67 | #59 = Class #60 // java/lang/System 68 | #60 = Utf8 java/lang/System 69 | #61 = NameAndType #62:#63 // out:Ljava/io/PrintStream; 70 | #62 = Utf8 out 71 | #63 = Utf8 Ljava/io/PrintStream; 72 | #64 = Class #65 // java/lang/StringBuilder 73 | #65 = Utf8 java/lang/StringBuilder 74 | #66 = String #67 // How Odd: 75 | #67 = Utf8 How Odd: 76 | #68 = Methodref #64.#69 // java/lang/StringBuilder."":(Ljava/lang/String;)V 77 | #69 = NameAndType #5:#70 // "":(Ljava/lang/String;)V 78 | #70 = Utf8 (Ljava/lang/String;)V 79 | #71 = Methodref #64.#72 // java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 80 | #72 = NameAndType #73:#74 // append:(J)Ljava/lang/StringBuilder; 81 | #73 = Utf8 append 82 | #74 = Utf8 (J)Ljava/lang/StringBuilder; 83 | #75 = Methodref #64.#76 // java/lang/StringBuilder.toString:()Ljava/lang/String; 84 | #76 = NameAndType #77:#78 // toString:()Ljava/lang/String; 85 | #77 = Utf8 toString 86 | #78 = Utf8 ()Ljava/lang/String; 87 | #79 = Methodref #80.#82 // java/io/PrintStream.println:(Ljava/lang/String;)V 88 | #80 = Class #81 // java/io/PrintStream 89 | #81 = Utf8 java/io/PrintStream 90 | #82 = NameAndType #83:#70 // println:(Ljava/lang/String;)V 91 | #83 = Utf8 println 92 | #84 = Utf8 SourceFile 93 | #85 = Utf8 WhenWillItExitInt2.java 94 | #86 = Utf8 BootstrapMethods 95 | #87 = Methodref #88.#90 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 96 | #88 = Class #89 // java/lang/invoke/LambdaMetafactory 97 | #89 = Utf8 java/lang/invoke/LambdaMetafactory 98 | #90 = NameAndType #91:#92 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 99 | #91 = Utf8 metafactory 100 | #92 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 101 | #93 = MethodHandle #6:#87 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 102 | #94 = MethodType #6 // ()V 103 | #95 = Methodref #1.#96 // safepoint/hang/WhenWillItExitInt2.lambda$0:()V 104 | #96 = NameAndType #54:#6 // lambda$0:()V 105 | #97 = MethodHandle #6:#95 // invokestatic safepoint/hang/WhenWillItExitInt2.lambda$0:()V 106 | #98 = MethodType #6 // ()V 107 | #99 = Utf8 InnerClasses 108 | #100 = Class #101 // java/lang/invoke/MethodHandles$Lookup 109 | #101 = Utf8 java/lang/invoke/MethodHandles$Lookup 110 | #102 = Class #103 // java/lang/invoke/MethodHandles 111 | #103 = Utf8 java/lang/invoke/MethodHandles 112 | #104 = Utf8 Lookup 113 | { 114 | public safepoint.hang.WhenWillItExitInt2(); 115 | descriptor: ()V 116 | flags: ACC_PUBLIC 117 | Code: 118 | stack=1, locals=1, args_size=1 119 | 0: aload_0 120 | 1: invokespecial #8 // Method java/lang/Object."":()V 121 | 4: return 122 | LineNumberTable: 123 | line 2: 0 124 | LocalVariableTable: 125 | Start Length Slot Name Signature 126 | 0 5 0 this Lsafepoint/hang/WhenWillItExitInt2; 127 | 128 | public static void main(java.lang.String[]) throws java.lang.InterruptedException; 129 | descriptor: ([Ljava/lang/String;)V 130 | flags: ACC_PUBLIC, ACC_STATIC 131 | Exceptions: 132 | throws java.lang.InterruptedException 133 | Code: 134 | stack=3, locals=2, args_size=1 135 | 0: new #19 // class java/lang/Thread 136 | 3: dup 137 | 4: invokedynamic #24, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable; 138 | 9: invokespecial #25 // Method java/lang/Thread."":(Ljava/lang/Runnable;)V 139 | 12: astore_1 140 | 13: aload_1 141 | 14: iconst_1 142 | 15: invokevirtual #28 // Method java/lang/Thread.setDaemon:(Z)V 143 | 18: aload_1 144 | 19: invokevirtual #32 // Method java/lang/Thread.start:()V 145 | 22: ldc2_w #35 // long 5000l 146 | 25: invokestatic #37 // Method java/lang/Thread.sleep:(J)V 147 | 28: return 148 | LineNumberTable: 149 | line 4: 0 150 | line 8: 13 151 | line 9: 18 152 | line 10: 22 153 | line 11: 28 154 | LocalVariableTable: 155 | Start Length Slot Name Signature 156 | 0 29 0 argc [Ljava/lang/String; 157 | 13 16 1 t Ljava/lang/Thread; 158 | 159 | private static long countOdds(int); 160 | descriptor: (I)J 161 | flags: ACC_PRIVATE, ACC_STATIC 162 | Code: 163 | stack=4, locals=5, args_size=1 164 | 0: lconst_0 165 | 1: lstore_1 166 | 2: iconst_0 167 | 3: istore_3 168 | 4: goto 37 169 | 7: iconst_0 170 | 8: istore 4 171 | 10: goto 28 172 | 13: iload 4 173 | 15: iconst_1 174 | 16: iand 175 | 17: iconst_1 176 | 18: if_icmpne 25 177 | 21: lload_1 178 | 22: lconst_1 179 | 23: ladd 180 | 24: lstore_1 181 | 25: iinc 4, 1 182 | 28: iload 4 183 | 30: iload_0 184 | 31: if_icmplt 13 185 | 34: iinc 3, 1 186 | 37: iload_3 187 | 38: iload_0 188 | 39: if_icmplt 7 189 | 42: lload_1 190 | 43: lreturn 191 | LineNumberTable: 192 | line 14: 0 193 | line 15: 2 194 | line 16: 7 195 | line 17: 13 196 | line 18: 21 197 | line 16: 25 198 | line 15: 34 199 | line 21: 42 200 | LocalVariableTable: 201 | Start Length Slot Name Signature 202 | 0 44 0 limit I 203 | 2 42 1 l J 204 | 4 38 3 i I 205 | 10 24 4 j I 206 | StackMapTable: number_of_entries = 5 207 | frame_type = 253 /* append */ 208 | offset_delta = 7 209 | locals = [ long, int ] 210 | frame_type = 252 /* append */ 211 | offset_delta = 5 212 | locals = [ int ] 213 | frame_type = 11 /* same */ 214 | frame_type = 2 /* same */ 215 | frame_type = 250 /* chop */ 216 | offset_delta = 8 217 | 218 | private static void lambda$0(); 219 | descriptor: ()V 220 | flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC 221 | Code: 222 | stack=4, locals=2, args_size=0 223 | 0: ldc #55 // int 2147483647 224 | 2: invokestatic #56 // Method countOdds:(I)J 225 | 5: lstore_0 226 | 6: getstatic #58 // Field java/lang/System.out:Ljava/io/PrintStream; 227 | 9: new #64 // class java/lang/StringBuilder 228 | 12: dup 229 | 13: ldc #66 // String How Odd: 230 | 15: invokespecial #68 // Method java/lang/StringBuilder."":(Ljava/lang/String;)V 231 | 18: lload_0 232 | 19: invokevirtual #71 // Method java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 233 | 22: invokevirtual #75 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 234 | 25: invokevirtual #79 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 235 | 28: return 236 | LineNumberTable: 237 | line 5: 0 238 | line 6: 6 239 | line 7: 28 240 | LocalVariableTable: 241 | Start Length Slot Name Signature 242 | 6 22 0 l J 243 | } 244 | SourceFile: "WhenWillItExitInt2.java" 245 | BootstrapMethods: 246 | 0: #93 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 247 | Method arguments: 248 | #94 ()V 249 | #97 invokestatic safepoint/hang/WhenWillItExitInt2.lambda$0:()V 250 | #98 ()V 251 | InnerClasses: 252 | public static final #104= #100 of #102; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles 253 | -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt2.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nitsanw/safepoint-experiments/a828993eda77e10b8115fb76da835098e39a34fd/WhenWillItExitInt-bytecode-comparison/eclipse/safepoint/hang/WhenWillItExitInt2.class -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt.bytecode: -------------------------------------------------------------------------------- 1 | Classfile /home/yak/git/safepoint-experiments/WhenWillItExitInt-bytecode-comparison/WhenWillItExitInt.javac.class 2 | Last modified 23 Jan 2016; size 1800 bytes 3 | MD5 checksum e0a53c3191f8e556fa322a4bd09306c4 4 | Compiled from "WhenWillItExitInt.java" 5 | public class safepoint.hang.WhenWillItExitInt 6 | minor version: 0 7 | major version: 52 8 | flags: ACC_PUBLIC, ACC_SUPER 9 | Constant pool: 10 | #1 = Methodref #21.#46 // java/lang/Object."":()V 11 | #2 = Class #47 // java/lang/Thread 12 | #3 = InvokeDynamic #0:#52 // #0:run:()Ljava/lang/Runnable; 13 | #4 = Methodref #2.#53 // java/lang/Thread."":(Ljava/lang/Runnable;)V 14 | #5 = Methodref #2.#54 // java/lang/Thread.setDaemon:(Z)V 15 | #6 = Methodref #2.#55 // java/lang/Thread.start:()V 16 | #7 = Long 5000l 17 | #9 = Methodref #2.#56 // java/lang/Thread.sleep:(J)V 18 | #10 = Class #57 // java/lang/Integer 19 | #11 = Integer 2147483647 20 | #12 = Fieldref #58.#59 // java/lang/System.out:Ljava/io/PrintStream; 21 | #13 = Class #60 // java/lang/StringBuilder 22 | #14 = Methodref #13.#46 // java/lang/StringBuilder."":()V 23 | #15 = String #61 // How Odd: 24 | #16 = Methodref #13.#62 // java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 25 | #17 = Methodref #13.#63 // java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 26 | #18 = Methodref #13.#64 // java/lang/StringBuilder.toString:()Ljava/lang/String; 27 | #19 = Methodref #65.#66 // java/io/PrintStream.println:(Ljava/lang/String;)V 28 | #20 = Class #67 // safepoint/hang/WhenWillItExitInt 29 | #21 = Class #68 // java/lang/Object 30 | #22 = Utf8 31 | #23 = Utf8 ()V 32 | #24 = Utf8 Code 33 | #25 = Utf8 LineNumberTable 34 | #26 = Utf8 LocalVariableTable 35 | #27 = Utf8 this 36 | #28 = Utf8 Lsafepoint/hang/WhenWillItExitInt; 37 | #29 = Utf8 main 38 | #30 = Utf8 ([Ljava/lang/String;)V 39 | #31 = Utf8 argc 40 | #32 = Utf8 [Ljava/lang/String; 41 | #33 = Utf8 t 42 | #34 = Utf8 Ljava/lang/Thread; 43 | #35 = Utf8 Exceptions 44 | #36 = Class #69 // java/lang/InterruptedException 45 | #37 = Utf8 lambda$main$4 46 | #38 = Utf8 j 47 | #39 = Utf8 I 48 | #40 = Utf8 i 49 | #41 = Utf8 l 50 | #42 = Utf8 J 51 | #43 = Utf8 StackMapTable 52 | #44 = Utf8 SourceFile 53 | #45 = Utf8 WhenWillItExitInt.java 54 | #46 = NameAndType #22:#23 // "":()V 55 | #47 = Utf8 java/lang/Thread 56 | #48 = Utf8 BootstrapMethods 57 | #49 = MethodHandle #6:#70 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 58 | #50 = MethodType #23 // ()V 59 | #51 = MethodHandle #6:#71 // invokestatic safepoint/hang/WhenWillItExitInt.lambda$main$4:()V 60 | #52 = NameAndType #72:#73 // run:()Ljava/lang/Runnable; 61 | #53 = NameAndType #22:#74 // "":(Ljava/lang/Runnable;)V 62 | #54 = NameAndType #75:#76 // setDaemon:(Z)V 63 | #55 = NameAndType #77:#23 // start:()V 64 | #56 = NameAndType #78:#79 // sleep:(J)V 65 | #57 = Utf8 java/lang/Integer 66 | #58 = Class #80 // java/lang/System 67 | #59 = NameAndType #81:#82 // out:Ljava/io/PrintStream; 68 | #60 = Utf8 java/lang/StringBuilder 69 | #61 = Utf8 How Odd: 70 | #62 = NameAndType #83:#84 // append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 71 | #63 = NameAndType #83:#85 // append:(J)Ljava/lang/StringBuilder; 72 | #64 = NameAndType #86:#87 // toString:()Ljava/lang/String; 73 | #65 = Class #88 // java/io/PrintStream 74 | #66 = NameAndType #89:#90 // println:(Ljava/lang/String;)V 75 | #67 = Utf8 safepoint/hang/WhenWillItExitInt 76 | #68 = Utf8 java/lang/Object 77 | #69 = Utf8 java/lang/InterruptedException 78 | #70 = Methodref #91.#92 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 79 | #71 = Methodref #20.#93 // safepoint/hang/WhenWillItExitInt.lambda$main$4:()V 80 | #72 = Utf8 run 81 | #73 = Utf8 ()Ljava/lang/Runnable; 82 | #74 = Utf8 (Ljava/lang/Runnable;)V 83 | #75 = Utf8 setDaemon 84 | #76 = Utf8 (Z)V 85 | #77 = Utf8 start 86 | #78 = Utf8 sleep 87 | #79 = Utf8 (J)V 88 | #80 = Utf8 java/lang/System 89 | #81 = Utf8 out 90 | #82 = Utf8 Ljava/io/PrintStream; 91 | #83 = Utf8 append 92 | #84 = Utf8 (Ljava/lang/String;)Ljava/lang/StringBuilder; 93 | #85 = Utf8 (J)Ljava/lang/StringBuilder; 94 | #86 = Utf8 toString 95 | #87 = Utf8 ()Ljava/lang/String; 96 | #88 = Utf8 java/io/PrintStream 97 | #89 = Utf8 println 98 | #90 = Utf8 (Ljava/lang/String;)V 99 | #91 = Class #94 // java/lang/invoke/LambdaMetafactory 100 | #92 = NameAndType #95:#99 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 101 | #93 = NameAndType #37:#23 // lambda$main$4:()V 102 | #94 = Utf8 java/lang/invoke/LambdaMetafactory 103 | #95 = Utf8 metafactory 104 | #96 = Class #101 // java/lang/invoke/MethodHandles$Lookup 105 | #97 = Utf8 Lookup 106 | #98 = Utf8 InnerClasses 107 | #99 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 108 | #100 = Class #102 // java/lang/invoke/MethodHandles 109 | #101 = Utf8 java/lang/invoke/MethodHandles$Lookup 110 | #102 = Utf8 java/lang/invoke/MethodHandles 111 | { 112 | public safepoint.hang.WhenWillItExitInt(); 113 | descriptor: ()V 114 | flags: ACC_PUBLIC 115 | Code: 116 | stack=1, locals=1, args_size=1 117 | 0: aload_0 118 | 1: invokespecial #1 // Method java/lang/Object."":()V 119 | 4: return 120 | LineNumberTable: 121 | line 2: 0 122 | LocalVariableTable: 123 | Start Length Slot Name Signature 124 | 0 5 0 this Lsafepoint/hang/WhenWillItExitInt; 125 | 126 | public static void main(java.lang.String[]) throws java.lang.InterruptedException; 127 | descriptor: ([Ljava/lang/String;)V 128 | flags: ACC_PUBLIC, ACC_STATIC 129 | Code: 130 | stack=3, locals=2, args_size=1 131 | 0: new #2 // class java/lang/Thread 132 | 3: dup 133 | 4: invokedynamic #3, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable; 134 | 9: invokespecial #4 // Method java/lang/Thread."":(Ljava/lang/Runnable;)V 135 | 12: astore_1 136 | 13: aload_1 137 | 14: iconst_1 138 | 15: invokevirtual #5 // Method java/lang/Thread.setDaemon:(Z)V 139 | 18: aload_1 140 | 19: invokevirtual #6 // Method java/lang/Thread.start:()V 141 | 22: ldc2_w #7 // long 5000l 142 | 25: invokestatic #9 // Method java/lang/Thread.sleep:(J)V 143 | 28: return 144 | LineNumberTable: 145 | line 4: 0 146 | line 14: 13 147 | line 15: 18 148 | line 16: 22 149 | line 17: 28 150 | LocalVariableTable: 151 | Start Length Slot Name Signature 152 | 0 29 0 argc [Ljava/lang/String; 153 | 13 16 1 t Ljava/lang/Thread; 154 | Exceptions: 155 | throws java.lang.InterruptedException 156 | 157 | private static void lambda$main$4(); 158 | descriptor: ()V 159 | flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC 160 | Code: 161 | stack=4, locals=4, args_size=0 162 | 0: lconst_0 163 | 1: lstore_0 164 | 2: iconst_0 165 | 3: istore_2 166 | 4: iload_2 167 | 5: ldc #11 // int 2147483647 168 | 7: if_icmpge 41 169 | 10: iconst_0 170 | 11: istore_3 171 | 12: iload_3 172 | 13: ldc #11 // int 2147483647 173 | 15: if_icmpge 35 174 | 18: iload_3 175 | 19: iconst_1 176 | 20: iand 177 | 21: iconst_1 178 | 22: if_icmpne 29 179 | 25: lload_0 180 | 26: lconst_1 181 | 27: ladd 182 | 28: lstore_0 183 | 29: iinc 3, 1 184 | 32: goto 12 185 | 35: iinc 2, 1 186 | 38: goto 4 187 | 41: getstatic #12 // Field java/lang/System.out:Ljava/io/PrintStream; 188 | 44: new #13 // class java/lang/StringBuilder 189 | 47: dup 190 | 48: invokespecial #14 // Method java/lang/StringBuilder."":()V 191 | 51: ldc #15 // String How Odd: 192 | 53: invokevirtual #16 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 193 | 56: lload_0 194 | 57: invokevirtual #17 // Method java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 195 | 60: invokevirtual #18 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 196 | 63: invokevirtual #19 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 197 | 66: return 198 | LineNumberTable: 199 | line 5: 0 200 | line 6: 2 201 | line 7: 10 202 | line 8: 18 203 | line 9: 25 204 | line 7: 29 205 | line 6: 35 206 | line 12: 41 207 | line 13: 66 208 | LocalVariableTable: 209 | Start Length Slot Name Signature 210 | 12 23 3 j I 211 | 4 37 2 i I 212 | 2 65 0 l J 213 | StackMapTable: number_of_entries = 5 214 | frame_type = 253 /* append */ 215 | offset_delta = 4 216 | locals = [ long, int ] 217 | frame_type = 252 /* append */ 218 | offset_delta = 7 219 | locals = [ int ] 220 | frame_type = 16 /* same */ 221 | frame_type = 250 /* chop */ 222 | offset_delta = 5 223 | frame_type = 250 /* chop */ 224 | offset_delta = 5 225 | } 226 | SourceFile: "WhenWillItExitInt.java" 227 | InnerClasses: 228 | public static final #97= #96 of #100; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles 229 | BootstrapMethods: 230 | 0: #49 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 231 | Method arguments: 232 | #50 ()V 233 | #51 invokestatic safepoint/hang/WhenWillItExitInt.lambda$main$4:()V 234 | #50 ()V 235 | -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nitsanw/safepoint-experiments/a828993eda77e10b8115fb76da835098e39a34fd/WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt.class -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt1.bytecode: -------------------------------------------------------------------------------- 1 | Classfile /home/yak/git/safepoint-experiments/WhenWillItExitInt-bytecode-comparison/WhenWillItExitInt1.javac.class 2 | Last modified 23 Jan 2016; size 1897 bytes 3 | MD5 checksum a484b287c5a478f6f1048c257d83916b 4 | Compiled from "WhenWillItExitInt1.java" 5 | public class safepoint.hang.WhenWillItExitInt1 6 | minor version: 0 7 | major version: 52 8 | flags: ACC_PUBLIC, ACC_SUPER 9 | Constant pool: 10 | #1 = Methodref #22.#49 // java/lang/Object."":()V 11 | #2 = Class #50 // java/lang/Thread 12 | #3 = InvokeDynamic #0:#55 // #0:run:()Ljava/lang/Runnable; 13 | #4 = Methodref #2.#56 // java/lang/Thread."":(Ljava/lang/Runnable;)V 14 | #5 = Methodref #2.#57 // java/lang/Thread.setDaemon:(Z)V 15 | #6 = Methodref #2.#58 // java/lang/Thread.start:()V 16 | #7 = Long 5000l 17 | #9 = Methodref #2.#59 // java/lang/Thread.sleep:(J)V 18 | #10 = Class #60 // java/lang/Integer 19 | #11 = Integer 2147483647 20 | #12 = Methodref #21.#61 // safepoint/hang/WhenWillItExitInt1.countOdds:()J 21 | #13 = Fieldref #62.#63 // java/lang/System.out:Ljava/io/PrintStream; 22 | #14 = Class #64 // java/lang/StringBuilder 23 | #15 = Methodref #14.#49 // java/lang/StringBuilder."":()V 24 | #16 = String #65 // How Odd: 25 | #17 = Methodref #14.#66 // java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 26 | #18 = Methodref #14.#67 // java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 27 | #19 = Methodref #14.#68 // java/lang/StringBuilder.toString:()Ljava/lang/String; 28 | #20 = Methodref #69.#70 // java/io/PrintStream.println:(Ljava/lang/String;)V 29 | #21 = Class #71 // safepoint/hang/WhenWillItExitInt1 30 | #22 = Class #72 // java/lang/Object 31 | #23 = Utf8 32 | #24 = Utf8 ()V 33 | #25 = Utf8 Code 34 | #26 = Utf8 LineNumberTable 35 | #27 = Utf8 LocalVariableTable 36 | #28 = Utf8 this 37 | #29 = Utf8 Lsafepoint/hang/WhenWillItExitInt1; 38 | #30 = Utf8 main 39 | #31 = Utf8 ([Ljava/lang/String;)V 40 | #32 = Utf8 argc 41 | #33 = Utf8 [Ljava/lang/String; 42 | #34 = Utf8 t 43 | #35 = Utf8 Ljava/lang/Thread; 44 | #36 = Utf8 Exceptions 45 | #37 = Class #73 // java/lang/InterruptedException 46 | #38 = Utf8 countOdds 47 | #39 = Utf8 ()J 48 | #40 = Utf8 j 49 | #41 = Utf8 I 50 | #42 = Utf8 i 51 | #43 = Utf8 l 52 | #44 = Utf8 J 53 | #45 = Utf8 StackMapTable 54 | #46 = Utf8 lambda$main$0 55 | #47 = Utf8 SourceFile 56 | #48 = Utf8 WhenWillItExitInt1.java 57 | #49 = NameAndType #23:#24 // "":()V 58 | #50 = Utf8 java/lang/Thread 59 | #51 = Utf8 BootstrapMethods 60 | #52 = MethodHandle #6:#74 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 61 | #53 = MethodType #24 // ()V 62 | #54 = MethodHandle #6:#75 // invokestatic safepoint/hang/WhenWillItExitInt1.lambda$main$0:()V 63 | #55 = NameAndType #76:#77 // run:()Ljava/lang/Runnable; 64 | #56 = NameAndType #23:#78 // "":(Ljava/lang/Runnable;)V 65 | #57 = NameAndType #79:#80 // setDaemon:(Z)V 66 | #58 = NameAndType #81:#24 // start:()V 67 | #59 = NameAndType #82:#83 // sleep:(J)V 68 | #60 = Utf8 java/lang/Integer 69 | #61 = NameAndType #38:#39 // countOdds:()J 70 | #62 = Class #84 // java/lang/System 71 | #63 = NameAndType #85:#86 // out:Ljava/io/PrintStream; 72 | #64 = Utf8 java/lang/StringBuilder 73 | #65 = Utf8 How Odd: 74 | #66 = NameAndType #87:#88 // append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 75 | #67 = NameAndType #87:#89 // append:(J)Ljava/lang/StringBuilder; 76 | #68 = NameAndType #90:#91 // toString:()Ljava/lang/String; 77 | #69 = Class #92 // java/io/PrintStream 78 | #70 = NameAndType #93:#94 // println:(Ljava/lang/String;)V 79 | #71 = Utf8 safepoint/hang/WhenWillItExitInt1 80 | #72 = Utf8 java/lang/Object 81 | #73 = Utf8 java/lang/InterruptedException 82 | #74 = Methodref #95.#96 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 83 | #75 = Methodref #21.#97 // safepoint/hang/WhenWillItExitInt1.lambda$main$0:()V 84 | #76 = Utf8 run 85 | #77 = Utf8 ()Ljava/lang/Runnable; 86 | #78 = Utf8 (Ljava/lang/Runnable;)V 87 | #79 = Utf8 setDaemon 88 | #80 = Utf8 (Z)V 89 | #81 = Utf8 start 90 | #82 = Utf8 sleep 91 | #83 = Utf8 (J)V 92 | #84 = Utf8 java/lang/System 93 | #85 = Utf8 out 94 | #86 = Utf8 Ljava/io/PrintStream; 95 | #87 = Utf8 append 96 | #88 = Utf8 (Ljava/lang/String;)Ljava/lang/StringBuilder; 97 | #89 = Utf8 (J)Ljava/lang/StringBuilder; 98 | #90 = Utf8 toString 99 | #91 = Utf8 ()Ljava/lang/String; 100 | #92 = Utf8 java/io/PrintStream 101 | #93 = Utf8 println 102 | #94 = Utf8 (Ljava/lang/String;)V 103 | #95 = Class #98 // java/lang/invoke/LambdaMetafactory 104 | #96 = NameAndType #99:#103 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 105 | #97 = NameAndType #46:#24 // lambda$main$0:()V 106 | #98 = Utf8 java/lang/invoke/LambdaMetafactory 107 | #99 = Utf8 metafactory 108 | #100 = Class #105 // java/lang/invoke/MethodHandles$Lookup 109 | #101 = Utf8 Lookup 110 | #102 = Utf8 InnerClasses 111 | #103 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 112 | #104 = Class #106 // java/lang/invoke/MethodHandles 113 | #105 = Utf8 java/lang/invoke/MethodHandles$Lookup 114 | #106 = Utf8 java/lang/invoke/MethodHandles 115 | { 116 | public safepoint.hang.WhenWillItExitInt1(); 117 | descriptor: ()V 118 | flags: ACC_PUBLIC 119 | Code: 120 | stack=1, locals=1, args_size=1 121 | 0: aload_0 122 | 1: invokespecial #1 // Method java/lang/Object."":()V 123 | 4: return 124 | LineNumberTable: 125 | line 2: 0 126 | LocalVariableTable: 127 | Start Length Slot Name Signature 128 | 0 5 0 this Lsafepoint/hang/WhenWillItExitInt1; 129 | 130 | public static void main(java.lang.String[]) throws java.lang.InterruptedException; 131 | descriptor: ([Ljava/lang/String;)V 132 | flags: ACC_PUBLIC, ACC_STATIC 133 | Code: 134 | stack=3, locals=2, args_size=1 135 | 0: new #2 // class java/lang/Thread 136 | 3: dup 137 | 4: invokedynamic #3, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable; 138 | 9: invokespecial #4 // Method java/lang/Thread."":(Ljava/lang/Runnable;)V 139 | 12: astore_1 140 | 13: aload_1 141 | 14: iconst_1 142 | 15: invokevirtual #5 // Method java/lang/Thread.setDaemon:(Z)V 143 | 18: aload_1 144 | 19: invokevirtual #6 // Method java/lang/Thread.start:()V 145 | 22: ldc2_w #7 // long 5000l 146 | 25: invokestatic #9 // Method java/lang/Thread.sleep:(J)V 147 | 28: return 148 | LineNumberTable: 149 | line 4: 0 150 | line 8: 13 151 | line 9: 18 152 | line 10: 22 153 | line 11: 28 154 | LocalVariableTable: 155 | Start Length Slot Name Signature 156 | 0 29 0 argc [Ljava/lang/String; 157 | 13 16 1 t Ljava/lang/Thread; 158 | Exceptions: 159 | throws java.lang.InterruptedException 160 | 161 | private static long countOdds(); 162 | descriptor: ()J 163 | flags: ACC_PRIVATE, ACC_STATIC 164 | Code: 165 | stack=4, locals=4, args_size=0 166 | 0: lconst_0 167 | 1: lstore_0 168 | 2: iconst_0 169 | 3: istore_2 170 | 4: iload_2 171 | 5: ldc #11 // int 2147483647 172 | 7: if_icmpge 41 173 | 10: iconst_0 174 | 11: istore_3 175 | 12: iload_3 176 | 13: ldc #11 // int 2147483647 177 | 15: if_icmpge 35 178 | 18: iload_3 179 | 19: iconst_1 180 | 20: iand 181 | 21: iconst_1 182 | 22: if_icmpne 29 183 | 25: lload_0 184 | 26: lconst_1 185 | 27: ladd 186 | 28: lstore_0 187 | 29: iinc 3, 1 188 | 32: goto 12 189 | 35: iinc 2, 1 190 | 38: goto 4 191 | 41: lload_0 192 | 42: lreturn 193 | LineNumberTable: 194 | line 14: 0 195 | line 15: 2 196 | line 16: 10 197 | line 17: 18 198 | line 18: 25 199 | line 16: 29 200 | line 15: 35 201 | line 21: 41 202 | LocalVariableTable: 203 | Start Length Slot Name Signature 204 | 12 23 3 j I 205 | 4 37 2 i I 206 | 2 41 0 l J 207 | StackMapTable: number_of_entries = 5 208 | frame_type = 253 /* append */ 209 | offset_delta = 4 210 | locals = [ long, int ] 211 | frame_type = 252 /* append */ 212 | offset_delta = 7 213 | locals = [ int ] 214 | frame_type = 16 /* same */ 215 | frame_type = 250 /* chop */ 216 | offset_delta = 5 217 | frame_type = 250 /* chop */ 218 | offset_delta = 5 219 | 220 | private static void lambda$main$0(); 221 | descriptor: ()V 222 | flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC 223 | Code: 224 | stack=4, locals=2, args_size=0 225 | 0: invokestatic #12 // Method countOdds:()J 226 | 3: lstore_0 227 | 4: getstatic #13 // Field java/lang/System.out:Ljava/io/PrintStream; 228 | 7: new #14 // class java/lang/StringBuilder 229 | 10: dup 230 | 11: invokespecial #15 // Method java/lang/StringBuilder."":()V 231 | 14: ldc #16 // String How Odd: 232 | 16: invokevirtual #17 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 233 | 19: lload_0 234 | 20: invokevirtual #18 // Method java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 235 | 23: invokevirtual #19 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 236 | 26: invokevirtual #20 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 237 | 29: return 238 | LineNumberTable: 239 | line 5: 0 240 | line 6: 4 241 | line 7: 29 242 | LocalVariableTable: 243 | Start Length Slot Name Signature 244 | 4 26 0 l J 245 | } 246 | SourceFile: "WhenWillItExitInt1.java" 247 | InnerClasses: 248 | public static final #101= #100 of #104; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles 249 | BootstrapMethods: 250 | 0: #52 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 251 | Method arguments: 252 | #53 ()V 253 | #54 invokestatic safepoint/hang/WhenWillItExitInt1.lambda$main$0:()V 254 | #53 ()V 255 | -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt1.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nitsanw/safepoint-experiments/a828993eda77e10b8115fb76da835098e39a34fd/WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt1.class -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt2.bytecode: -------------------------------------------------------------------------------- 1 | Classfile /home/yak/git/safepoint-experiments/WhenWillItExitInt-bytecode-comparison/WhenWillItExitInt2.javac.class 2 | Last modified 23 Jan 2016; size 1919 bytes 3 | MD5 checksum 076071691b0360fa90db4a0f63d55ec2 4 | Compiled from "WhenWillItExitInt2.java" 5 | public class safepoint.hang.WhenWillItExitInt2 6 | minor version: 0 7 | major version: 52 8 | flags: ACC_PUBLIC, ACC_SUPER 9 | Constant pool: 10 | #1 = Methodref #22.#50 // java/lang/Object."":()V 11 | #2 = Class #51 // java/lang/Thread 12 | #3 = InvokeDynamic #0:#56 // #0:run:()Ljava/lang/Runnable; 13 | #4 = Methodref #2.#57 // java/lang/Thread."":(Ljava/lang/Runnable;)V 14 | #5 = Methodref #2.#58 // java/lang/Thread.setDaemon:(Z)V 15 | #6 = Methodref #2.#59 // java/lang/Thread.start:()V 16 | #7 = Long 5000l 17 | #9 = Methodref #2.#60 // java/lang/Thread.sleep:(J)V 18 | #10 = Class #61 // java/lang/Integer 19 | #11 = Integer 2147483647 20 | #12 = Methodref #21.#62 // safepoint/hang/WhenWillItExitInt2.countOdds:(I)J 21 | #13 = Fieldref #63.#64 // java/lang/System.out:Ljava/io/PrintStream; 22 | #14 = Class #65 // java/lang/StringBuilder 23 | #15 = Methodref #14.#50 // java/lang/StringBuilder."":()V 24 | #16 = String #66 // How Odd: 25 | #17 = Methodref #14.#67 // java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 26 | #18 = Methodref #14.#68 // java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 27 | #19 = Methodref #14.#69 // java/lang/StringBuilder.toString:()Ljava/lang/String; 28 | #20 = Methodref #70.#71 // java/io/PrintStream.println:(Ljava/lang/String;)V 29 | #21 = Class #72 // safepoint/hang/WhenWillItExitInt2 30 | #22 = Class #73 // java/lang/Object 31 | #23 = Utf8 32 | #24 = Utf8 ()V 33 | #25 = Utf8 Code 34 | #26 = Utf8 LineNumberTable 35 | #27 = Utf8 LocalVariableTable 36 | #28 = Utf8 this 37 | #29 = Utf8 Lsafepoint/hang/WhenWillItExitInt2; 38 | #30 = Utf8 main 39 | #31 = Utf8 ([Ljava/lang/String;)V 40 | #32 = Utf8 argc 41 | #33 = Utf8 [Ljava/lang/String; 42 | #34 = Utf8 t 43 | #35 = Utf8 Ljava/lang/Thread; 44 | #36 = Utf8 Exceptions 45 | #37 = Class #74 // java/lang/InterruptedException 46 | #38 = Utf8 countOdds 47 | #39 = Utf8 (I)J 48 | #40 = Utf8 j 49 | #41 = Utf8 I 50 | #42 = Utf8 i 51 | #43 = Utf8 limit 52 | #44 = Utf8 l 53 | #45 = Utf8 J 54 | #46 = Utf8 StackMapTable 55 | #47 = Utf8 lambda$main$6 56 | #48 = Utf8 SourceFile 57 | #49 = Utf8 WhenWillItExitInt2.java 58 | #50 = NameAndType #23:#24 // "":()V 59 | #51 = Utf8 java/lang/Thread 60 | #52 = Utf8 BootstrapMethods 61 | #53 = MethodHandle #6:#75 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 62 | #54 = MethodType #24 // ()V 63 | #55 = MethodHandle #6:#76 // invokestatic safepoint/hang/WhenWillItExitInt2.lambda$main$6:()V 64 | #56 = NameAndType #77:#78 // run:()Ljava/lang/Runnable; 65 | #57 = NameAndType #23:#79 // "":(Ljava/lang/Runnable;)V 66 | #58 = NameAndType #80:#81 // setDaemon:(Z)V 67 | #59 = NameAndType #82:#24 // start:()V 68 | #60 = NameAndType #83:#84 // sleep:(J)V 69 | #61 = Utf8 java/lang/Integer 70 | #62 = NameAndType #38:#39 // countOdds:(I)J 71 | #63 = Class #85 // java/lang/System 72 | #64 = NameAndType #86:#87 // out:Ljava/io/PrintStream; 73 | #65 = Utf8 java/lang/StringBuilder 74 | #66 = Utf8 How Odd: 75 | #67 = NameAndType #88:#89 // append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 76 | #68 = NameAndType #88:#90 // append:(J)Ljava/lang/StringBuilder; 77 | #69 = NameAndType #91:#92 // toString:()Ljava/lang/String; 78 | #70 = Class #93 // java/io/PrintStream 79 | #71 = NameAndType #94:#95 // println:(Ljava/lang/String;)V 80 | #72 = Utf8 safepoint/hang/WhenWillItExitInt2 81 | #73 = Utf8 java/lang/Object 82 | #74 = Utf8 java/lang/InterruptedException 83 | #75 = Methodref #96.#97 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 84 | #76 = Methodref #21.#98 // safepoint/hang/WhenWillItExitInt2.lambda$main$6:()V 85 | #77 = Utf8 run 86 | #78 = Utf8 ()Ljava/lang/Runnable; 87 | #79 = Utf8 (Ljava/lang/Runnable;)V 88 | #80 = Utf8 setDaemon 89 | #81 = Utf8 (Z)V 90 | #82 = Utf8 start 91 | #83 = Utf8 sleep 92 | #84 = Utf8 (J)V 93 | #85 = Utf8 java/lang/System 94 | #86 = Utf8 out 95 | #87 = Utf8 Ljava/io/PrintStream; 96 | #88 = Utf8 append 97 | #89 = Utf8 (Ljava/lang/String;)Ljava/lang/StringBuilder; 98 | #90 = Utf8 (J)Ljava/lang/StringBuilder; 99 | #91 = Utf8 toString 100 | #92 = Utf8 ()Ljava/lang/String; 101 | #93 = Utf8 java/io/PrintStream 102 | #94 = Utf8 println 103 | #95 = Utf8 (Ljava/lang/String;)V 104 | #96 = Class #99 // java/lang/invoke/LambdaMetafactory 105 | #97 = NameAndType #100:#104 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 106 | #98 = NameAndType #47:#24 // lambda$main$6:()V 107 | #99 = Utf8 java/lang/invoke/LambdaMetafactory 108 | #100 = Utf8 metafactory 109 | #101 = Class #106 // java/lang/invoke/MethodHandles$Lookup 110 | #102 = Utf8 Lookup 111 | #103 = Utf8 InnerClasses 112 | #104 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 113 | #105 = Class #107 // java/lang/invoke/MethodHandles 114 | #106 = Utf8 java/lang/invoke/MethodHandles$Lookup 115 | #107 = Utf8 java/lang/invoke/MethodHandles 116 | { 117 | public safepoint.hang.WhenWillItExitInt2(); 118 | descriptor: ()V 119 | flags: ACC_PUBLIC 120 | Code: 121 | stack=1, locals=1, args_size=1 122 | 0: aload_0 123 | 1: invokespecial #1 // Method java/lang/Object."":()V 124 | 4: return 125 | LineNumberTable: 126 | line 2: 0 127 | LocalVariableTable: 128 | Start Length Slot Name Signature 129 | 0 5 0 this Lsafepoint/hang/WhenWillItExitInt2; 130 | 131 | public static void main(java.lang.String[]) throws java.lang.InterruptedException; 132 | descriptor: ([Ljava/lang/String;)V 133 | flags: ACC_PUBLIC, ACC_STATIC 134 | Code: 135 | stack=3, locals=2, args_size=1 136 | 0: new #2 // class java/lang/Thread 137 | 3: dup 138 | 4: invokedynamic #3, 0 // InvokeDynamic #0:run:()Ljava/lang/Runnable; 139 | 9: invokespecial #4 // Method java/lang/Thread."":(Ljava/lang/Runnable;)V 140 | 12: astore_1 141 | 13: aload_1 142 | 14: iconst_1 143 | 15: invokevirtual #5 // Method java/lang/Thread.setDaemon:(Z)V 144 | 18: aload_1 145 | 19: invokevirtual #6 // Method java/lang/Thread.start:()V 146 | 22: ldc2_w #7 // long 5000l 147 | 25: invokestatic #9 // Method java/lang/Thread.sleep:(J)V 148 | 28: return 149 | LineNumberTable: 150 | line 4: 0 151 | line 8: 13 152 | line 9: 18 153 | line 10: 22 154 | line 11: 28 155 | LocalVariableTable: 156 | Start Length Slot Name Signature 157 | 0 29 0 argc [Ljava/lang/String; 158 | 13 16 1 t Ljava/lang/Thread; 159 | Exceptions: 160 | throws java.lang.InterruptedException 161 | 162 | private static long countOdds(int); 163 | descriptor: (I)J 164 | flags: ACC_PRIVATE, ACC_STATIC 165 | Code: 166 | stack=4, locals=5, args_size=1 167 | 0: lconst_0 168 | 1: lstore_1 169 | 2: iconst_0 170 | 3: istore_3 171 | 4: iload_3 172 | 5: iload_0 173 | 6: if_icmpge 42 174 | 9: iconst_0 175 | 10: istore 4 176 | 12: iload 4 177 | 14: iload_0 178 | 15: if_icmpge 36 179 | 18: iload 4 180 | 20: iconst_1 181 | 21: iand 182 | 22: iconst_1 183 | 23: if_icmpne 30 184 | 26: lload_1 185 | 27: lconst_1 186 | 28: ladd 187 | 29: lstore_1 188 | 30: iinc 4, 1 189 | 33: goto 12 190 | 36: iinc 3, 1 191 | 39: goto 4 192 | 42: lload_1 193 | 43: lreturn 194 | LineNumberTable: 195 | line 14: 0 196 | line 15: 2 197 | line 16: 9 198 | line 17: 18 199 | line 18: 26 200 | line 16: 30 201 | line 15: 36 202 | line 21: 42 203 | LocalVariableTable: 204 | Start Length Slot Name Signature 205 | 12 24 4 j I 206 | 4 38 3 i I 207 | 0 44 0 limit I 208 | 2 42 1 l J 209 | StackMapTable: number_of_entries = 5 210 | frame_type = 253 /* append */ 211 | offset_delta = 4 212 | locals = [ long, int ] 213 | frame_type = 252 /* append */ 214 | offset_delta = 7 215 | locals = [ int ] 216 | frame_type = 17 /* same */ 217 | frame_type = 250 /* chop */ 218 | offset_delta = 5 219 | frame_type = 250 /* chop */ 220 | offset_delta = 5 221 | 222 | private static void lambda$main$6(); 223 | descriptor: ()V 224 | flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC 225 | Code: 226 | stack=4, locals=2, args_size=0 227 | 0: ldc #11 // int 2147483647 228 | 2: invokestatic #12 // Method countOdds:(I)J 229 | 5: lstore_0 230 | 6: getstatic #13 // Field java/lang/System.out:Ljava/io/PrintStream; 231 | 9: new #14 // class java/lang/StringBuilder 232 | 12: dup 233 | 13: invokespecial #15 // Method java/lang/StringBuilder."":()V 234 | 16: ldc #16 // String How Odd: 235 | 18: invokevirtual #17 // Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder; 236 | 21: lload_0 237 | 22: invokevirtual #18 // Method java/lang/StringBuilder.append:(J)Ljava/lang/StringBuilder; 238 | 25: invokevirtual #19 // Method java/lang/StringBuilder.toString:()Ljava/lang/String; 239 | 28: invokevirtual #20 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 240 | 31: return 241 | LineNumberTable: 242 | line 5: 0 243 | line 6: 6 244 | line 7: 31 245 | LocalVariableTable: 246 | Start Length Slot Name Signature 247 | 6 26 0 l J 248 | } 249 | SourceFile: "WhenWillItExitInt2.java" 250 | InnerClasses: 251 | public static final #102= #101 of #105; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles 252 | BootstrapMethods: 253 | 0: #53 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 254 | Method arguments: 255 | #54 ()V 256 | #55 invokestatic safepoint/hang/WhenWillItExitInt2.lambda$main$6:()V 257 | #54 ()V 258 | -------------------------------------------------------------------------------- /WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt2.class: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nitsanw/safepoint-experiments/a828993eda77e10b8115fb76da835098e39a34fd/WhenWillItExitInt-bytecode-comparison/javac/safepoint/hang/WhenWillItExitInt2.class -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 3 | 4.0.0 4 | 5 | psy.lob.saw 6 | safepoints-experiments 7 | 1.0 8 | jar 9 | 10 | Safepoints Experiments 11 | 12 | 3.0 13 | 14 | 15 | 16 | 17 | org.openjdk.jmh 18 | jmh-core 19 | ${jmh.version} 20 | 21 | 22 | org.openjdk.jmh 23 | jmh-generator-annprocess 24 | ${jmh.version} 25 | provided 26 | 27 | 28 | 29 | 30 | UTF-8 31 | 1.11.3 32 | 1.6 33 | benchmarks 34 | 35 | 36 | 37 | 38 | 39 | org.apache.maven.plugins 40 | maven-compiler-plugin 41 | 3.1 42 | 43 | ${javac.target} 44 | ${javac.target} 45 | ${javac.target} 46 | 47 | 48 | 49 | org.apache.maven.plugins 50 | maven-shade-plugin 51 | 2.2 52 | 53 | 54 | package 55 | 56 | shade 57 | 58 | 59 | ${uberjar.name} 60 | 61 | 62 | org.openjdk.jmh.Main 63 | 64 | 65 | 66 | 67 | 71 | *:* 72 | 73 | META-INF/*.SF 74 | META-INF/*.DSA 75 | META-INF/*.RSA 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | maven-clean-plugin 88 | 2.5 89 | 90 | 91 | maven-deploy-plugin 92 | 2.8.1 93 | 94 | 95 | maven-install-plugin 96 | 2.5.1 97 | 98 | 99 | maven-jar-plugin 100 | 2.4 101 | 102 | 103 | maven-javadoc-plugin 104 | 2.9.1 105 | 106 | 107 | maven-resources-plugin 108 | 2.6 109 | 110 | 111 | maven-site-plugin 112 | 3.3 113 | 114 | 115 | maven-source-plugin 116 | 2.2.1 117 | 118 | 119 | maven-surefire-plugin 120 | 2.17 121 | 122 | 123 | 124 | 125 | 126 | 127 | -------------------------------------------------------------------------------- /src/main/java/safepoint/fair/LoveAtATimeOfSafepoints.java: -------------------------------------------------------------------------------- 1 | package safepoint.fair; 2 | 3 | import java.util.concurrent.TimeUnit; 4 | import java.util.concurrent.locks.LockSupport; 5 | 6 | import org.openjdk.jmh.annotations.Benchmark; 7 | import org.openjdk.jmh.annotations.BenchmarkMode; 8 | import org.openjdk.jmh.annotations.Group; 9 | import org.openjdk.jmh.annotations.Mode; 10 | import org.openjdk.jmh.annotations.OutputTimeUnit; 11 | import org.openjdk.jmh.annotations.Param; 12 | import org.openjdk.jmh.annotations.Scope; 13 | import org.openjdk.jmh.annotations.Setup; 14 | import org.openjdk.jmh.annotations.State; 15 | 16 | @BenchmarkMode(Mode.AverageTime) 17 | @OutputTimeUnit(TimeUnit.NANOSECONDS) 18 | @State(Scope.Thread) 19 | public abstract class LoveAtATimeOfSafepoints { 20 | @Param("32768") 21 | int size; 22 | @Param("10") 23 | int k; 24 | @Param("100") 25 | int intervalMs; 26 | 27 | @Param({ "0" }) 28 | int idleThreads; 29 | Thread[] pool; 30 | 31 | byte[] soggyBottoms; 32 | 33 | @Setup 34 | public final void bakeACake() { 35 | soggyBottoms = new byte[size]; 36 | if (idleThreads != 0) { 37 | pool = new Thread[idleThreads]; 38 | for (int i = 0; i < idleThreads; i++) { 39 | pool[i] = new Thread(new Runnable() { 40 | 41 | @Override 42 | public void run() { 43 | 44 | parkDeep(256); 45 | } 46 | }); 47 | pool[i].setDaemon(true); 48 | pool[i].start(); 49 | } 50 | } 51 | } 52 | 53 | static void parkDeep(int i) { 54 | if (i == 0) { 55 | LockSupport.park(); 56 | } 57 | else { 58 | parkDeep(i - 1); 59 | } 60 | } 61 | 62 | @Benchmark 63 | @Group("run_together") 64 | public boolean contains1() { 65 | int needle = 1; 66 | byte[] haystack = soggyBottoms; 67 | return containsNeedle1(needle, haystack); 68 | } 69 | 70 | @Benchmark 71 | @Group("run_together") 72 | public boolean contains1ToK() { 73 | byte[] haystack = soggyBottoms; 74 | for (int needle = 1; needle <= k; needle++) { 75 | if (containsNeedle2(needle, haystack)) { 76 | return true; 77 | } 78 | } 79 | return false; 80 | } 81 | 82 | private static boolean containsNeedle1(int needle, byte[] haystack) { 83 | for (int i = 0; i < haystack.length - 3; i++) { 84 | if (((haystack[i] << 24) | (haystack[i + 1] << 16) | (haystack[i + 2] << 8) 85 | | haystack[i + 3]) == needle) { 86 | return true; 87 | } 88 | } 89 | return false; 90 | } 91 | 92 | private static boolean containsNeedle2(int needle, byte[] haystack) { 93 | for (int i = 0; i < haystack.length - 3; i++) { 94 | if (((haystack[i] << 24) | (haystack[i + 1] << 16) | (haystack[i + 2] << 8) 95 | | haystack[i + 3]) == needle) { 96 | return true; 97 | } 98 | } 99 | return false; 100 | } 101 | 102 | @Benchmark 103 | @Group("run_together") 104 | public Object safepoint() { 105 | if (intervalMs == 0) 106 | return null; 107 | LockSupport.parkNanos(intervalMs * 1000000); 108 | return safepointMethod(); 109 | } 110 | 111 | protected abstract Object safepointMethod(); 112 | 113 | @Benchmark 114 | @Group("run_together") 115 | public void park() { 116 | if (intervalMs == 0) 117 | return; 118 | LockSupport.parkNanos(intervalMs * 1000000); 119 | } 120 | } 121 | -------------------------------------------------------------------------------- /src/main/java/safepoint/fair/SafepointUsingFindDeadlocks.java: -------------------------------------------------------------------------------- 1 | package safepoint.fair; 2 | 3 | import java.lang.management.ManagementFactory; 4 | 5 | public class SafepointUsingFindDeadlocks extends SafepointUsingThreadsDump { 6 | @Override 7 | protected Object safepointMethod() { 8 | return ManagementFactory.getThreadMXBean().findDeadlockedThreads(); 9 | } 10 | 11 | } 12 | -------------------------------------------------------------------------------- /src/main/java/safepoint/fair/SafepointUsingGc.java: -------------------------------------------------------------------------------- 1 | package safepoint.fair; 2 | 3 | public class SafepointUsingGc extends LoveAtATimeOfSafepoints { 4 | @Override 5 | protected Object safepointMethod() { 6 | System.gc(); 7 | return null; 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /src/main/java/safepoint/fair/SafepointUsingThreadGetInfo.java: -------------------------------------------------------------------------------- 1 | package safepoint.fair; 2 | 3 | import java.lang.management.ManagementFactory; 4 | import java.util.concurrent.ThreadLocalRandom; 5 | 6 | public class SafepointUsingThreadGetInfo extends LoveAtATimeOfSafepoints { 7 | @Override 8 | protected Object safepointMethod() { 9 | long[] threadIds = ManagementFactory.getThreadMXBean().getAllThreadIds(); 10 | long tid = threadIds[ThreadLocalRandom.current().nextInt(threadIds.length)]; 11 | return ManagementFactory.getThreadMXBean().getThreadInfo(tid, 256); 12 | } 13 | 14 | } 15 | -------------------------------------------------------------------------------- /src/main/java/safepoint/fair/SafepointUsingThreadsDump.java: -------------------------------------------------------------------------------- 1 | package safepoint.fair; 2 | 3 | import java.lang.management.ManagementFactory; 4 | 5 | public class SafepointUsingThreadsDump extends LoveAtATimeOfSafepoints { 6 | 7 | 8 | @Override 9 | protected Object safepointMethod() { 10 | return ManagementFactory.getThreadMXBean().dumpAllThreads(false, false); 11 | } 12 | 13 | } 14 | -------------------------------------------------------------------------------- /src/main/java/safepoint/hang/WhenWillItExitInt.java: -------------------------------------------------------------------------------- 1 | package safepoint.hang; 2 | 3 | public class WhenWillItExitInt { 4 | public static void main(String[] argc) throws InterruptedException { 5 | Thread t = new Thread(new Runnable() { 6 | @Override 7 | public void run() { 8 | long l = 0; 9 | for (int i = 0; i < Integer.MAX_VALUE; i++) { 10 | for (int j = 0; j < Integer.MAX_VALUE; j++) { 11 | if ((j & 1) == 1) 12 | l++; 13 | } 14 | } 15 | System.out.println("How Odd:" + l); 16 | } 17 | }); 18 | t.setDaemon(true); 19 | t.start(); 20 | Thread.sleep(5000); 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /src/main/java/safepoint/hang/WhenWillItExitInt1.java: -------------------------------------------------------------------------------- 1 | package safepoint.hang; 2 | 3 | public class WhenWillItExitInt1 { 4 | public static void main(String[] argc) throws InterruptedException { 5 | Thread t = new Thread(new Runnable() { 6 | 7 | @Override 8 | public void run() { 9 | long l = countOdds(); 10 | System.out.println("How Odd:" + l); 11 | } 12 | }); 13 | t.setDaemon(true); 14 | t.start(); 15 | Thread.sleep(5000); 16 | } 17 | 18 | private static long countOdds() { 19 | long l = 0; 20 | for (int i = 0; i < Integer.MAX_VALUE; i++) { 21 | for (int j = 0; j < Integer.MAX_VALUE; j++) { 22 | if ((j & 1) == 1) 23 | l++; 24 | } 25 | } 26 | return l; 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /src/main/java/safepoint/hang/WhenWillItExitInt2.java: -------------------------------------------------------------------------------- 1 | package safepoint.hang; 2 | 3 | public class WhenWillItExitInt2 { 4 | public static void main(String[] argc) throws InterruptedException { 5 | Thread t = new Thread(new Runnable() { 6 | 7 | @Override 8 | public void run() { 9 | long l = countOdds(Integer.MAX_VALUE); 10 | System.out.println("How Odd:" + l); 11 | } 12 | }); 13 | t.setDaemon(true); 14 | t.start(); 15 | Thread.sleep(5000); 16 | } 17 | 18 | private static long countOdds(int limit) { 19 | long l = 0; 20 | for (int i = 0; i < limit; i++) { 21 | for (int j = 0; j < limit; j++) { 22 | if ((j & 1) == 1) 23 | l++; 24 | } 25 | } 26 | return l; 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /src/main/java/safepoint/hang/WhenWillItExitInt3.java: -------------------------------------------------------------------------------- 1 | package safepoint.hang; 2 | 3 | public class WhenWillItExitInt3 { 4 | public static void main(String[] argc) throws InterruptedException { 5 | for (int i = 0; i < 100000; i++) { 6 | countOdds(10); 7 | } 8 | Thread t = new Thread(new Runnable() { 9 | 10 | @Override 11 | public void run() { 12 | long l = countOdds(Integer.MAX_VALUE); 13 | System.out.println("How Odd:" + l); 14 | } 15 | }); 16 | t.setDaemon(true); 17 | t.start(); 18 | Thread.sleep(5000); 19 | } 20 | 21 | private static long countOdds(int limit) { 22 | long l = 0; 23 | int i = 0; 24 | while (i++ < limit) { 25 | for (int j = 0; j < limit; j++) { 26 | if ((j & 1) == 1) 27 | l++; 28 | } 29 | } 30 | return l; 31 | } 32 | } 33 | -------------------------------------------------------------------------------- /src/main/java/safepoint/hang/WhenWillItExitIntInfinite.java: -------------------------------------------------------------------------------- 1 | package safepoint.hang; 2 | 3 | public class WhenWillItExitIntInfinite { 4 | public static void main(String[] argc) throws InterruptedException { 5 | Thread t = new Thread(new Runnable() { 6 | 7 | @Override 8 | public void run() { 9 | long l = 0; 10 | for (int i = 0; i < Integer.MAX_VALUE; i += 2) { 11 | if ((i & 4) == 1) 12 | l++; 13 | } 14 | System.out.println("How Odd:" + l); 15 | } 16 | }); 17 | t.setDaemon(true); 18 | t.start(); 19 | Thread.sleep(5000); 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /src/main/java/safepoint/hang/WhenWillItExitLong.java: -------------------------------------------------------------------------------- 1 | package safepoint.hang; 2 | 3 | public class WhenWillItExitLong { 4 | public static void main(String[] argc) throws InterruptedException { 5 | Thread t = new Thread(new Runnable() { 6 | 7 | @Override 8 | public void run() { 9 | long l = 0; 10 | for (long i = 0; i < Long.MAX_VALUE; i++) { 11 | if ((i & 1) == 1) 12 | l++; 13 | } 14 | System.out.println("How Odd:" + l); 15 | } 16 | }); 17 | t.setDaemon(true); 18 | t.start(); 19 | Thread.sleep(5000); 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /src/main/java/safepoint/optimizations/SafepointKillLoopOptimizations.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Licensed under the Apache License, Version 2.0 (the "License"); 3 | * you may not use this file except in compliance with the License. 4 | * You may obtain a copy of the License at 5 | * 6 | * http://www.apache.org/licenses/LICENSE-2.0 7 | * 8 | * Unless required by applicable law or agreed to in writing, software 9 | * distributed under the License is distributed on an "AS IS" BASIS, 10 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 | * See the License for the specific language governing permissions and 12 | * limitations under the License. 13 | */ 14 | package safepoint.optimizations; 15 | 16 | import java.util.Arrays; 17 | import java.util.Random; 18 | import java.util.concurrent.TimeUnit; 19 | 20 | import org.openjdk.jmh.annotations.Benchmark; 21 | import org.openjdk.jmh.annotations.BenchmarkMode; 22 | import org.openjdk.jmh.annotations.Level; 23 | import org.openjdk.jmh.annotations.Mode; 24 | import org.openjdk.jmh.annotations.OutputTimeUnit; 25 | import org.openjdk.jmh.annotations.Param; 26 | import org.openjdk.jmh.annotations.Scope; 27 | import org.openjdk.jmh.annotations.Setup; 28 | import org.openjdk.jmh.annotations.State; 29 | 30 | @State(Scope.Thread) 31 | @BenchmarkMode(Mode.AverageTime) 32 | @OutputTimeUnit(TimeUnit.NANOSECONDS) 33 | public class SafepointKillLoopOptimizations { 34 | 35 | @Param({ "100", "1000", "10000" }) 36 | public int size; 37 | 38 | private DataSet datasetA; 39 | private DataSet datasetB; 40 | 41 | private static final class DataSet { 42 | private final int[] data; 43 | 44 | public DataSet(DataSet ds) { 45 | this.data = Arrays.copyOf(ds.data, ds.data.length); 46 | } 47 | 48 | public DataSet(int size) { 49 | Random r = new Random(); 50 | data = new int[size]; 51 | for (int i = 0; i < size; ++i) { 52 | data[i] = r.nextInt(); 53 | } 54 | } 55 | 56 | int intSize() { 57 | return data.length; 58 | } 59 | 60 | int intGet(int index) { 61 | return data[index]; 62 | } 63 | 64 | void intSet(int index, int v) { 65 | data[index] = v; 66 | } 67 | 68 | long longSize() { 69 | return data.length; 70 | } 71 | 72 | int longGet(long index) { 73 | return data[(int) index]; 74 | } 75 | 76 | void longSet(long index, int v) { 77 | data[(int) index] = v; 78 | } 79 | } 80 | 81 | @Setup(Level.Trial) 82 | public void setup() { 83 | datasetA = new DataSet(size); 84 | datasetB = new DataSet(datasetA); 85 | } 86 | 87 | @Benchmark 88 | public int SumInt() { 89 | int sum = 0; 90 | for (int index = 0; index < datasetA.intSize(); ++index) { 91 | sum += datasetA.intGet(index); 92 | } 93 | return sum; 94 | } 95 | 96 | @Benchmark 97 | public int sumLong() { 98 | int sum = 0; 99 | for (long index = 0; index < datasetA.longSize(); ++index) { 100 | sum += datasetA.longGet(index); 101 | } 102 | return sum; 103 | } 104 | 105 | @Benchmark 106 | public boolean equalsInt() { 107 | for (int index = 0; index < datasetA.intSize(); ++index) { 108 | if (datasetA.intGet(index) != datasetB.intGet(index)) 109 | return false; 110 | } 111 | return true; 112 | } 113 | 114 | @Benchmark 115 | public boolean equalsLong() { 116 | for (long index = 0; index < datasetA.longSize(); ++index) { 117 | if (datasetA.longGet(index) != datasetB.longGet(index)) 118 | return false; 119 | } 120 | return true; 121 | } 122 | 123 | @Benchmark 124 | public void fillInt() { 125 | for (int index = 0; index < datasetA.intSize(); ++index) { 126 | datasetA.intSet(index, size); 127 | } 128 | } 129 | 130 | @Benchmark 131 | public void fillLong() { 132 | for (long index = 0; index < datasetA.longSize(); ++index) { 133 | datasetA.longSet(index, size); 134 | } 135 | } 136 | 137 | @Benchmark 138 | public void copyInt() { 139 | for (int index = 0; index < datasetA.intSize(); ++index) { 140 | datasetA.intSet(index, datasetB.intGet(index)); 141 | } 142 | } 143 | 144 | @Benchmark 145 | public void copyLong() { 146 | for (long index = 0; index < datasetA.longSize(); ++index) { 147 | datasetA.longSet(index, datasetB.longGet(index)); 148 | } 149 | } 150 | 151 | @Benchmark 152 | public void copyLongWithBatches() { 153 | long baseIndex = 0; 154 | final long length = datasetA.longSize(); 155 | final int copySize = 4096; 156 | for (; baseIndex < length; baseIndex += copySize) { 157 | copyIntLoop(baseIndex, copySize); 158 | } 159 | int leftover = (int) (length & 4095); 160 | copyIntLoop(baseIndex - 4096, leftover); 161 | } 162 | 163 | private void copyIntLoop(long baseIndex, final int copySize) { 164 | for (int offset = 0; offset < copySize; offset++) { 165 | datasetA.longSet(baseIndex + offset, datasetB.longGet(baseIndex + offset)); 166 | } 167 | } 168 | } -------------------------------------------------------------------------------- /src/main/java/safepoint/profiling/SafepointProfiling.java: -------------------------------------------------------------------------------- 1 | package safepoint.profiling; 2 | 3 | import java.util.concurrent.TimeUnit; 4 | 5 | import org.openjdk.jmh.annotations.Benchmark; 6 | import org.openjdk.jmh.annotations.BenchmarkMode; 7 | import org.openjdk.jmh.annotations.CompilerControl; 8 | import org.openjdk.jmh.annotations.Mode; 9 | import org.openjdk.jmh.annotations.OutputTimeUnit; 10 | import org.openjdk.jmh.annotations.Param; 11 | import org.openjdk.jmh.annotations.Scope; 12 | import org.openjdk.jmh.annotations.Setup; 13 | import org.openjdk.jmh.annotations.State; 14 | 15 | @BenchmarkMode(Mode.AverageTime) 16 | @OutputTimeUnit(TimeUnit.NANOSECONDS) 17 | @State(Scope.Thread) 18 | public class SafepointProfiling { 19 | @Param("1000") 20 | int size; 21 | Thread[] pool; 22 | 23 | byte[] buffer; 24 | boolean result; 25 | 26 | @Setup 27 | public final void setup() { 28 | buffer = new byte[size]; 29 | } 30 | 31 | @Benchmark 32 | public void blameSetResult() { 33 | byte b = 0; 34 | for (int i = 0; i < size; i++) { 35 | b += buffer[i]; 36 | } 37 | setResult(b); 38 | } 39 | 40 | @Benchmark 41 | public void blameSetResultDeep() { 42 | byte b = 0; 43 | for (int i = 0; i < size; i++) { 44 | b += buffer[i]; 45 | } 46 | setResult5(b); 47 | } 48 | 49 | @Benchmark 50 | @CompilerControl(CompilerControl.Mode.DONT_INLINE) 51 | public void blameSetResultDeeper() { 52 | byte b = 0; 53 | for (int i = 0; i < size; i++) { 54 | b += buffer[i]; 55 | } 56 | setResult8(b); 57 | } 58 | 59 | private void setResult8(byte b) { 60 | setResult7(b); 61 | } 62 | 63 | private void setResult7(byte b) { 64 | setResult6(b); 65 | } 66 | 67 | @CompilerControl(CompilerControl.Mode.DONT_INLINE) 68 | private void setResult6(byte b) { 69 | setResult5(b); 70 | } 71 | 72 | private void setResult5(byte b) { 73 | setResult4(b); 74 | } 75 | 76 | private void setResult4(byte b) { 77 | setResult3(b); 78 | } 79 | 80 | private void setResult3(byte b) { 81 | setResult2(b); 82 | } 83 | 84 | private void setResult2(byte b) { 85 | setResult(b); 86 | } 87 | 88 | private void setResult(byte b) { 89 | setResult(b == 1); 90 | } 91 | 92 | @CompilerControl(CompilerControl.Mode.DONT_INLINE) 93 | private void setResult(boolean b) { 94 | result = b; 95 | } 96 | 97 | @Benchmark 98 | @CompilerControl(CompilerControl.Mode.DONT_INLINE) 99 | public void meSoHotNoInline() { 100 | byte b = 0; 101 | for (int i = 0; i < size; i++) { 102 | b += buffer[i]; 103 | } 104 | result = b == 1; 105 | } 106 | 107 | @Benchmark 108 | public void meSoHotInline() { 109 | byte b = 0; 110 | for (int i = 0; i < size; i++) { 111 | b += buffer[i]; 112 | } 113 | result = b == 1; 114 | } 115 | } --------------------------------------------------------------------------------