├── .gitignore
├── README.md
├── cocoa-string-size-performance.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── Abhi.xcuserdatad
    │       └── xcschemes
    │           ├── cocoa-string-size-performance.xcscheme
    │           └── xcschememanagement.plist
└── cocoa-string-size-performance
    ├── cocoa-string-size-performance-Prefix.pch
    ├── cocoa_string_size_performance.1
    └── main.m


/.gitignore:
--------------------------------------------------------------------------------
 1 | # Xcode
 2 | #
 3 | build/
 4 | *.pbxuser
 5 | !default.pbxuser
 6 | *.mode1v3
 7 | !default.mode1v3
 8 | *.mode2v3
 9 | !default.mode2v3
10 | *.perspectivev3
11 | !default.perspectivev3
12 | xcuserdata
13 | *.xccheckout
14 | *.moved-aside
15 | DerivedData
16 | *.hmap
17 | *.ipa
18 | *.xcuserstate
19 | 
20 | # CocoaPods
21 | #
22 | # We recommend against adding the Pods directory to your .gitignore. However
23 | # you should judge for yourself, the pros and cons are mentioned at:
24 | # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
25 | #
26 | #Pods/
27 | 
28 | *.xcuserstate
29 | 
30 | cocoa-string-size-performance.xcodeproj/project.xcworkspace/xcuserdata/Abhi.xcuserdatad/UserInterfaceState.xcuserstate
31 | 
32 | *.xcuserstate
33 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # cocoa-string-size-performance
 2 | This is a console application in Cocoa to show the various ways to measure the width of text and its performance. There are 3 ways(that I figured out) to do this:
 3 | 
 4 | 
 5 | <li>[[NSString sizeWithAttributes:]](https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSString_AppKitAdditions/index.html#//apple_ref/occ/instm/NSString/sizeWithAttributes:)
 6 | <li> [[NSAttributedString size]](https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/NSAttributedString_UIKit_Additions/index.html#//apple_ref/occ/instm/NSAttributedString/size)
 7 | <li> [NSLayoutManager](https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/TextLayout/Tasks/StringHeight.html#//apple_ref/doc/uid/20001809-CJBGBIBB) (get text width instead of height) 
 8 | <br><br>
 9 | 
10 | To play with the project, download the file, open up main.m. <br>
11 | <ol>
12 | <li>Change ITEMS_COUNT to the number of strings you want measured.
13 | <li>Change ITEMS_ARRAY_CHUNK_THRESHOLD to chunk up a big array into small arrays.
14 | 
15 | Here are some performance metrics on my Macbook Pro running Yosemite 2.3GHz Intel i7 and 8GB memory.
16 | <pre><b>Count\Mechanism</b>    <b>sizeWithAttributes</b>    <b>NSAttributedString</b>    <b>NSLayoutManager</b></pre>
17 | <pre><b>1000</b>               <b>0.057</b>                 <b>0.031</b>                 <b>0.007</b></pre>
18 | <pre><b>10000</b>              <b>0.329</b>                 <b>0.325</b>                 <b>0.064</b></pre>
19 | <pre><b>100000</b>             <b>3.06</b>                  <b>3.14</b>                  <b>0.689</b></pre>
20 | <pre><b>1000000</b>            <b>29.5</b>                  <b>31.3</b>                  <b>7.06</b></pre>
21 | 
22 | <b>NOTE:</b> The NSLayoutManager mechanism creates an NSTextStorage object for every string. These objects are very heavyweight and memory intensive. By just creating 1 and re-using them however causes layout to happen for every string and the measurement time goes up to 40 seconds for a million strings.
23 | 
24 | <h1>UPDATE</h1>
25 | Using CoreText is the way to go. For the above table here is the performance metric with and without multithreading.
26 | <pre><b>Count\Mechanism</b>    <b>Core Text NO Multithreading</b>    <b>Core Text Multithreading</b></pre>
27 | <pre><b>1000</b>               <b>0.018</b>                          <b>0.02</b></pre>               
28 | <pre><b>10000</b>              <b>0.023</b>                          <b>0.023</b></pre>            
29 | <pre><b>100000</b>             <b>0.161</b>                          <b>0.061</b></pre>                   
30 | <pre><b>1000000</b>            <b>1.46</b>                           <b>0.447</b></pre>          
31 | 


--------------------------------------------------------------------------------
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 1 | //
 2 | //  Prefix header
 3 | //
 4 | //  The contents of this file are implicitly included at the beginning of every source file.
 5 | //
 6 | 
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 8 |     #import <Foundation/Foundation.h>
 9 | #endif
10 | 


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/cocoa-string-size-performance/cocoa_string_size_performance.1:
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 1 | .\"Modified from man(1) of FreeBSD, the NetBSD mdoc.template, and mdoc.samples.
 2 | .\"See Also:
 3 | .\"man mdoc.samples for a complete listing of options
 4 | .\"man mdoc for the short list of editing options
 5 | .\"/usr/share/misc/mdoc.template
 6 | .Dd 5/29/15               \" DATE 
 7 | .Dt cocoa-string-size-performance 1      \" Program name and manual section number 
 8 | .Os Darwin
 9 | .Sh NAME                 \" Section Header - required - don't modify 
10 | .Nm cocoa-string-size-performance,
11 | .\" The following lines are read in generating the apropos(man -k) database. Use only key
12 | .\" words here as the database is built based on the words here and in the .ND line. 
13 | .Nm Other_name_for_same_program(),
14 | .Nm Yet another name for the same program.
15 | .\" Use .Nm macro to designate other names for the documented program.
16 | .Nd This line parsed for whatis database.
17 | .Sh SYNOPSIS             \" Section Header - required - don't modify
18 | .Nm
19 | .Op Fl abcd              \" [-abcd]
20 | .Op Fl a Ar path         \" [-a path] 
21 | .Op Ar file              \" [file]
22 | .Op Ar                   \" [file ...]
23 | .Ar arg0                 \" Underlined argument - use .Ar anywhere to underline
24 | arg2 ...                 \" Arguments
25 | .Sh DESCRIPTION          \" Section Header - required - don't modify
26 | Use the .Nm macro to refer to your program throughout the man page like such:
27 | .Nm
28 | Underlining is accomplished with the .Ar macro like this:
29 | .Ar underlined text .
30 | .Pp                      \" Inserts a space
31 | A list of items with descriptions:
32 | .Bl -tag -width -indent  \" Begins a tagged list 
33 | .It item a               \" Each item preceded by .It macro
34 | Description of item a
35 | .It item b
36 | Description of item b
37 | .El                      \" Ends the list
38 | .Pp
39 | A list of flags and their descriptions:
40 | .Bl -tag -width -indent  \" Differs from above in tag removed 
41 | .It Fl a                 \"-a flag as a list item
42 | Description of -a flag
43 | .It Fl b
44 | Description of -b flag
45 | .El                      \" Ends the list
46 | .Pp
47 | .\" .Sh ENVIRONMENT      \" May not be needed
48 | .\" .Bl -tag -width "ENV_VAR_1" -indent \" ENV_VAR_1 is width of the string ENV_VAR_1
49 | .\" .It Ev ENV_VAR_1
50 | .\" Description of ENV_VAR_1
51 | .\" .It Ev ENV_VAR_2
52 | .\" Description of ENV_VAR_2
53 | .\" .El                      
54 | .Sh FILES                \" File used or created by the topic of the man page
55 | .Bl -tag -width "/Users/joeuser/Library/really_long_file_name" -compact
56 | .It Pa /usr/share/file_name
57 | FILE_1 description
58 | .It Pa /Users/joeuser/Library/really_long_file_name
59 | FILE_2 description
60 | .El                      \" Ends the list
61 | .\" .Sh DIAGNOSTICS       \" May not be needed
62 | .\" .Bl -diag
63 | .\" .It Diagnostic Tag
64 | .\" Diagnostic informtion here.
65 | .\" .It Diagnostic Tag
66 | .\" Diagnostic informtion here.
67 | .\" .El
68 | .Sh SEE ALSO 
69 | .\" List links in ascending order by section, alphabetically within a section.
70 | .\" Please do not reference files that do not exist without filing a bug report
71 | .Xr a 1 , 
72 | .Xr b 1 ,
73 | .Xr c 1 ,
74 | .Xr a 2 ,
75 | .Xr b 2 ,
76 | .Xr a 3 ,
77 | .Xr b 3 
78 | .\" .Sh BUGS              \" Document known, unremedied bugs 
79 | .\" .Sh HISTORY           \" Document history if command behaves in a unique manner


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/cocoa-string-size-performance/main.m:
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  1 | //
  2 | //  main.m
  3 | //  cocoa-string-size-performance
  4 | //
  5 | //  Created by Abhi on 5/29/15.
  6 | //  Copyright (c) 2015 ___Abhishek Moothedath___. All rights reserved.
  7 | //
  8 | 
  9 | #import <Cocoa/Cocoa.h>
 10 | 
 11 | #define ITEMS_COUNT 10000
 12 | #define ITEMS_ARRAY_CHUNK_THRESHOLD 1000
 13 | 
 14 | 
 15 | NS_INLINE NSArray* splitIntoChunks(NSArray *items, NSUInteger chunkSize)
 16 | {
 17 |     NSMutableArray *chunks = [NSMutableArray new];
 18 |     
 19 |     for(NSUInteger i = 0; i < items.count; i++)
 20 |     {
 21 |         NSUInteger chunkIndex = i / chunkSize;
 22 |         if(chunks.count <= chunkIndex)
 23 |         {
 24 |             NSMutableArray *chunk = [NSMutableArray new];
 25 |             [chunks addObject:chunk];
 26 |         }
 27 |         NSMutableArray *chunk = [chunks objectAtIndex:chunkIndex];
 28 |         [chunk addObject:[items objectAtIndex:i]];
 29 |     }
 30 |     
 31 |     return chunks;
 32 | }
 33 | 
 34 | NS_INLINE void performAnalysisUsingSizeWithAttributes(NSArray* items)
 35 | {
 36 |     double width = 0, timeTaken = 0;
 37 |     NSDate *startDate = [NSDate dateWithTimeIntervalSinceNow:0];
 38 |     for(NSString *item in items)
 39 |     {
 40 |         width = MAX(width, [item sizeWithAttributes:nil].width);
 41 |     }
 42 |     timeTaken = -[startDate timeIntervalSinceNow];
 43 |     NSLog(@"-----------------------Using [NSString sizeWithAttributes:]------------------\n");
 44 |     NSLog(@"Time to measure the width(%f) of %li strings is %f\n\n\n",width, items.count, timeTaken);
 45 | }
 46 | 
 47 | NS_INLINE void performAnalysisUsingNSAttributedString(NSArray* items)
 48 | {
 49 |     double width = 0, timeTaken = 0;
 50 |     NSDate *startDate = [NSDate dateWithTimeIntervalSinceNow:0];
 51 |     for(NSString *item in items)
 52 |     {
 53 |         NSAttributedString *attributedString = [[NSAttributedString alloc] initWithString:item];
 54 |         width = MAX(width, attributedString.size.width);
 55 |     }
 56 |     timeTaken = -[startDate timeIntervalSinceNow];
 57 |     NSLog(@"-----------------------Using [NSAttributedString size]------------------\n");
 58 |     NSLog(@"Time taken to measure the width(%f) of %li strings is %f\n\n\n",width, items.count, timeTaken);
 59 | }
 60 | 
 61 | static void performAnalysisUsingNSLayoutManager(NSArray* items)
 62 | {
 63 |     double width = 0, timeTaken = 0;
 64 |     NSDate *startDate = [NSDate dateWithTimeIntervalSinceNow:0];
 65 |     
 66 |     NSLayoutManager *layoutManager = [NSLayoutManager new];
 67 |     NSTextContainer *textContainer = [NSTextContainer new];
 68 |     [textContainer setLineFragmentPadding:0];
 69 |     [layoutManager addTextContainer:textContainer];
 70 |     
 71 |     NSMutableArray *textStorageObjects = [NSMutableArray new];
 72 |     for(NSString *item in items)
 73 |     {
 74 |         @autoreleasepool {
 75 |             NSTextStorage *textStorage = [[NSTextStorage alloc] initWithString:item];
 76 |             [textStorage addLayoutManager:layoutManager];
 77 |             [textStorageObjects addObject:textStorage];
 78 |         }
 79 |     }
 80 |     timeTaken = -[startDate timeIntervalSinceNow];
 81 |     NSLog(@"-----------------------Using NSLayoutManager------------------\n");
 82 |     NSLog(@"Time taken to create %li NSTextStorage objects is %f",items.count, timeTaken);
 83 |     
 84 |     startDate = [NSDate dateWithTimeIntervalSinceNow:0];
 85 |     [layoutManager glyphRangeForTextContainer:textContainer];
 86 |     width = [layoutManager usedRectForTextContainer:textContainer].size.width;
 87 |     timeTaken = -[startDate timeIntervalSinceNow];
 88 |     NSLog(@"Time taken to measure the width(%f) of %li strings is %f\n\n\n",width, items.count, timeTaken);
 89 | }
 90 | 
 91 | static void performUsingCoreText(NSArray *items)
 92 | {
 93 |     NSArray *chunks = splitIntoChunks(items, ITEMS_ARRAY_CHUNK_THRESHOLD);
 94 |     
 95 |     __block double width = 0, timeTaken;
 96 |     NSFont *font = [NSFont fontWithName:@"Helvetica" size:12];
 97 |     NSDictionary *attributes = @{NSFontAttributeName: font};
 98 |     CGPathRef path = CGPathCreateWithRect(CGRectMake(0, 0, CGFLOAT_MAX, CGFLOAT_MAX), NULL);
 99 |     
100 |     dispatch_group_t group = dispatch_group_create();
101 |     dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
102 |     
103 |     NSDate *startDate = [NSDate dateWithTimeIntervalSinceNow:0];
104 |     for(NSArray *chunk in chunks)
105 |     {
106 |         dispatch_group_async(group, queue, ^{
107 |             NSMutableAttributedString *mutableString = [[NSMutableAttributedString alloc]initWithString:[chunk componentsJoinedByString:@"\n"]
108 |                                                                                              attributes:attributes];
109 |             [mutableString appendAttributedString:[[NSAttributedString alloc] initWithString:@"\n"]];
110 |             CFAttributedStringRef stringRef = (__bridge CFAttributedStringRef)mutableString;
111 |             CTFramesetterRef framesetterRef = CTFramesetterCreateWithAttributedString(stringRef);
112 |             CTFrameRef frameRef = CTFramesetterCreateFrame(framesetterRef, CFRangeMake(0, mutableString.length), path, NULL);
113 |             
114 |             NSArray *lines = (__bridge NSArray*)CTFrameGetLines(frameRef);
115 |             
116 |             for(id item in lines)
117 |             {
118 |                 CTLineRef line = (__bridge CTLineRef)item;
119 |                 double lineWidth = CTLineGetTypographicBounds(line, NULL, NULL, NULL);
120 |                 width = MAX(width, lineWidth);
121 |             }
122 |         });
123 |     }
124 |     dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
125 | 
126 |     timeTaken = -[startDate timeIntervalSinceNow];
127 |     NSLog(@"-----------------------Using Core Text------------------\n");
128 |     NSLog(@"Time taken to measure the width(%f) of %li strings is %f",width, items.count, timeTaken);
129 | }
130 | 
131 | static NSString* randomStringWithLength(int len)
132 | {
133 |     NSString *letters = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
134 |     NSMutableString *randomString = [NSMutableString stringWithCapacity: len];
135 |     
136 |     for (int i=0; i<len; i++) {
137 |         [randomString appendFormat: @"%C", [letters characterAtIndex: arc4random_uniform([letters length])]];
138 |     }
139 |     
140 |     return randomString;
141 | }
142 | 
143 | int main(int argc, const char * argv[])
144 | {
145 |     NSMutableArray *items = [NSMutableArray new];
146 |     
147 | //    for(NSUInteger i = 0; i < ITEMS_COUNT; i++)
148 | //    {
149 | //        double random = (double)arc4random_uniform(1000) / 1000;
150 | //        NSString *randomNumber = [NSString stringWithFormat:@"%f", random];
151 | //        [items addObject:randomNumber];
152 | //    }
153 |     
154 |     for(NSUInteger i = 0; i < ITEMS_COUNT; i++)
155 |     {
156 |         double random = (double)arc4random_uniform(1000) / 1000;
157 |         NSString *randomNumber = randomStringWithLength((int)(random * 100));
158 |         [items addObject:randomNumber];
159 |     }
160 | 
161 | 
162 |     performAnalysisUsingSizeWithAttributes(items);
163 |     performAnalysisUsingNSAttributedString(items);
164 |     performAnalysisUsingNSLayoutManager(items);
165 |     performUsingCoreText(items);
166 |     
167 |     return 0;
168 | }
169 | 


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