c# – Mono SIMD性能恶化？

概述基准代码： using System;using System.Collections;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using Mono.Simd;using MathNet.Numerics.LinearAlgebra.Single;namespace XX 基准代码：

using System;using System.Collections;using System.Collections.Generic;using System.Diagnostics;using System.linq;using Mono.Simd;using MathNet.Numerics.linearalgebra.Single;namespace XXX {public static class TimeSpanExtensions {    public static double TotalNanoseconds(this TimeSpan timeSpan) {        return timeSpan.TotalMilliseconds * 1000000.0;    }}public sealed class SimdBenchmark : Benchmark {    Vector4f a = new Vector4f(1.0f,2.0f,3.0f,4.0f);    Vector4f b = new Vector4f(1.0f,4.0f);    Vector4f c;    public overrIDe voID Do() {        c = a + b;    }}public sealed class MathNetBenchmark : Benchmark {    DenseVector a = new DenseVector(new float[]{1.0f,4.0f});    DenseVector b = new DenseVector(new float[]{1.0f,4.0f});    DenseVector c;    public overrIDe voID Do() {        c = a + b;    }}public sealed class DefaultBenchmark : Benchmark {    Vector4 a = new Vector4(1.0f,4.0f);    Vector4 b = new Vector4(1.0f,4.0f);    Vector4 c;    public overrIDe voID Do() {        c = a + b;    }}public sealed class SimpleBenchmark : Benchmark {    float a = 1.0f;    float b = 2.0f;    float c;    public overrIDe voID Do() {        c = a + b;    }}public sealed class DelegateBenchmark : Benchmark {    private Readonly Action _action;    public DelegateBenchmark(Action action) {        _action = action;    }    public overrIDe voID Do() {        _action();    }}public abstract class Benchmark : IEnumerable<TimeSpan> {    public IEnumerator<TimeSpan> GetEnumerator() {        Do(); // warm-up!        GC.Collect(); // Collect garbage.        GC.WaitForPendingFinalizers(); // Wait until finalizers finish.        var stopwatch = new Stopwatch();        while (true) {            stopwatch.reset();            stopwatch.Start();            Do();            stopwatch.Stop();            yIEld return stopwatch.Elapsed;        }    }    IEnumerator IEnumerable.GetEnumerator() {        return GetEnumerator();    }    public abstract voID Do();}public struct Vector4 {    float x;    float y;    float z;    float w;    public Vector4(float x,float y,float z,float w) {        this.x = x;        this.y = y;        this.z = z;        this.w = w;    }    public static Vector4 operator +(Vector4 v1,Vector4 v2) {        return new Vector4(v1.x + v2.x,v1.y + v2.y,v1.z + v2.z,v1.w + v2.w);    }}class MainClass {    public static voID Main(string[] args) {        var avgNS1 = new SimdBenchmark().Take(1000).Average(timeSpan => timeSpan.TotalNanoseconds());        var avgNS2 = new SimpleBenchmark().Take(1000).Average(timeSpan => timeSpan.TotalNanoseconds());        var avgNS3 = new DefaultBenchmark().Take(1000).Average(timeSpan => timeSpan.TotalNanoseconds());        var avgNS4 = new MathNetBenchmark().Take(1000).Average(timeSpan => timeSpan.TotalNanoseconds());        Console.Writeline(avgNS1 + " ns");        Console.Writeline(avgNS2 + " ns");        Console.Writeline(avgNS3 + " ns");        Console.Writeline(avgNS4 + " ns");    }}}

环境设置：

windows 7 / Mono 2.10.8 / MonoDevelop 2.8.5

MonoDevelop设置：

>工具>选项> .NET运行时>单声道2.10.8(默认)
>项目>选项>构建>一般>目标框架>单声道/ .NET
4
>项目>选项>构建>编译器>一般选项>启用优化
>项目>选项>构建>编译器>一般选项>平台目标> 86
>项目>选项>运行>一般>参数> -O = SIMD

结果：

> 94.4 ns
> 29.7 ns
> 49.9 ns
> 231595.2 ns

解决方法 我会先怀疑你的基准测试基础设施.

有几点可能是：

>您正在使用“秒表”计时单次 *** 作 – 它没有分辨率>您的计时包括虚拟函数调用>您的样本量(1000)太小

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