├── .gitattributes ├── .gitignore ├── AccessPatternsApp ├── AccessPatternsApp.csproj ├── MemoryExpert-Slides-M13L04-Homework-Instructions.pdf └── Program.cs ├── Homework.sln ├── LICENSE.txt ├── MemoryExpert-Slides-M13L04-Homework-Instructions.pdf └── README.md /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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2 | using BenchmarkDotNet.Diagnosers; 3 | using BenchmarkDotNet.Running; 4 | 5 | // TODO: 6 | // - just run one or another benchmark, observe results! 7 | // - try to use commented HardwareCounters attribute in FalseSharingBenchmarks. 8 | // They are based on PMC (Precise Machine Counter) events. 9 | // - LLC_MISSES - Last level cache demand requests from this core that missed the LLC 10 | // - LLC_REFS - Last level cache demand requests from this core 11 | // NOTE: To use PMC hardware counters you have to DISABLE virtualization om your machine! 12 | 13 | BenchmarkRunner.Run(); 14 | BenchmarkRunner.Run(); 15 | 16 | public class AccessPatternsBenchmarks 17 | { 18 | [Params(50, 500, 5000)] 19 | public int Size { get; set; } 20 | 21 | [Benchmark] 22 | public void IJAccess() 23 | { 24 | int n = Size; 25 | int m = Size; 26 | int[,] tab = new int[n, m]; 27 | for (int i = 0; i < n; ++i) 28 | { 29 | for (int j = 0; j < m; ++j) 30 | tab[i, j] = 1; 31 | } 32 | } 33 | 34 | [Benchmark] 35 | public void JIAccess() 36 | { 37 | int n = Size; 38 | int m = Size; 39 | int[,] tab = new int[n, m]; 40 | for (int i = 0; i < n; ++i) 41 | { 42 | for (int j = 0; j < m; ++j) 43 | tab[j, i] = 1; 44 | } 45 | } 46 | } 47 | 48 | [MemoryDiagnoser] 49 | //[HardwareCounters(HardwareCounter.CacheMisses, HardwareCounter.LlcMisses)] 50 | public class FalseSharingBenchmarks 51 | { 52 | [Params(100_000_000)] 53 | public int Size { get; set; } 54 | 55 | public int[] sharedData = new int[4]; 56 | public int[] sharedData2 = new int[4 * 16]; 57 | public int[] sharedData3 = new int[4 * 16 + 16]; 58 | 59 | [Benchmark] 60 | public void DoSharingTest() 61 | { 62 | Thread[] workers = new Thread[4]; 63 | for (int i = 0; i < 4; ++i) 64 | { 65 | workers[i] = new Thread(idx => 66 | { 67 | int index = (int)idx; 68 | for (int j = 0; j < Size; ++j) 69 | sharedData[index] = sharedData[index] + 1; 70 | }); 71 | } 72 | for (int i = 0; i < 4; ++i) workers[i].Start(i); 73 | for (int i = 0; i < 4; ++i) workers[i].Join(); 74 | } 75 | 76 | [Benchmark] 77 | public void DoSharingTest2() 78 | { 79 | Thread[] workers = new Thread[4]; 80 | for (int i = 0; i < 4; ++i) 81 | { 82 | workers[i] = new Thread(idx => 83 | { 84 | int index = (int)idx; 85 | for (int j = 0; j < Size; ++j) 86 | sharedData2[index * 16] = sharedData2[index * 16] + 1; 87 | }); 88 | } 89 | for (int i = 0; i < 4; ++i) workers[i].Start(i); 90 | for (int i = 0; i < 4; ++i) workers[i].Join(); 91 | } 92 | 93 | [Benchmark] 94 | public void DoSharingTest3() 95 | { 96 | Thread[] workers = new Thread[4]; 97 | for (int i = 0; i < 4; ++i) 98 | { 99 | workers[i] = new Thread(idx => 100 | { 101 | int index = (int)idx + 1; 102 | for (int j = 0; j < Size; ++j) 103 | sharedData3[index * 16] = sharedData3[index * 16] + 1; 104 | }); 105 | } 106 | for (int i = 0; i < 4; ++i) workers[i].Start(i); 107 | for (int i = 0; i < 4; ++i) workers[i].Join(); 108 | } 109 | } -------------------------------------------------------------------------------- /Homework.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 17 4 | VisualStudioVersion = 17.0.31912.275 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AccessPatternsApp", "AccessPatternsApp\AccessPatternsApp.csproj", "{2D02FDCA-E4A8-47EE-B141-A5D7C1BF88DC}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {2D02FDCA-E4A8-47EE-B141-A5D7C1BF88DC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {2D02FDCA-E4A8-47EE-B141-A5D7C1BF88DC}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {2D02FDCA-E4A8-47EE-B141-A5D7C1BF88DC}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {2D02FDCA-E4A8-47EE-B141-A5D7C1BF88DC}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {401CAC74-D1CE-4F6C-AD6B-4C293F7607D1} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) [year] [fullname] 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /MemoryExpert-Slides-M13L04-Homework-Instructions.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/nirzaf/AccessPatternsApp/fec7a9cb4c1aa99f4412a28fa79d9e53c01a3d2e/MemoryExpert-Slides-M13L04-Homework-Instructions.pdf -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Module13-Data-Oriented-Design --------------------------------------------------------------------------------