编辑：在第二篇文章中查看下面更好的基准！！！
我在（Win8.1、Linux、BSD 和 OSX）上使用 .NET 4.5 与 Mono 3.2.x 进行了一些性能测试。
注意：这些测试是使用 Mono x86 或 .NET x86 arch 编译的。他们没有在 Virtual Box 中运行。测试计算机使用本地运行的“Win8/Linux/BSD”进行三次启动，Mac 使用“OSX/Win7”进行双重启动。另请注意，“WIN32”编译器指令仅在 Win8/Win7 上用于“TimeBeginPeriod”，以强制 Windows 中的秒表准确度。Linux/BSD/OSX 不需要这个，但 windows 需要。
这是测试代码：
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using numf = System.Single;
using numi = System.Int32;
#if WIN32
using System.Runtime.InteropServices;
#endif
namespace Benchmarks
{
struct Vector4
{
public numf X, Y, Z, W;
public static Vector4 operator+(Vector4 p1, Vector4 p2)
{
p1.X += p2.X;
p1.Y += p2.Y;
p1.Z += p2.Z;
p1.W += p2.W;
return p1;
}
public static Vector4 operator-(Vector4 p1, Vector4 p2)
{
p1.X -= p2.X;
p1.Y -= p2.Y;
p1.Z -= p2.Z;
p1.W -= p2.W;
return p1;
}
public static Vector4 operator*(Vector4 p1, Vector4 p2)
{
p1.X *= p2.X;
p1.Y *= p2.Y;
p1.Z *= p2.Z;
p1.W *= p2.W;
return p1;
}
public static Vector4 operator/(Vector4 p1, Vector4 p2)
{
p1.X /= p2.X;
p1.Y /= p2.Y;
p1.Z /= p2.Z;
p1.W /= p2.W;
return p1;
}
public override string ToString()
{
return string.Format("{0}, {1}, {2}, {3}", X, Y, Z, W);
}
}
class Program
{
#if WIN32
[StructLayout(LayoutKind.Sequential)]
public struct TimeCaps
{
public uint wPeriodMin;
public uint wPeriodMax;
}
private static TimeCaps caps;
[DllImport("winmm.dll", EntryPoint="timeGetDevCaps", SetLastError=true)]
public static extern uint TimeGetDevCaps(ref TimeCaps timeCaps, uint sizeTimeCaps);
[DllImport("winmm.dll", EntryPoint="timeBeginPeriod", SetLastError=true)]
public static extern uint TimeBeginPeriod(uint uMilliseconds);
[DllImport("winmm.dll", EntryPoint="timeEndPeriod", SetLastError=true)]
public static extern uint TimeEndPeriod(uint uMilliseconds);
public static void OptimizedMode()
{
caps = new TimeCaps();
if (TimeGetDevCaps(ref caps, (uint)System.Runtime.InteropServices.Marshal.SizeOf(caps)) != 0)
{
Console.WriteLine("StopWatch: TimeGetDevCaps failed");
}
if (TimeBeginPeriod(caps.wPeriodMin) != 0)
{
Console.WriteLine("StopWatch: TimeBeginPeriod failed");
}
}
public static void EndOptimizedMode()
{
if (TimeEndPeriod(caps.wPeriodMin) != 0)
{
Console.WriteLine("StopWatch: TimeEndPeriod failed");
}
}
#endif
static Random random;
static void Main(string[] args)
{
#if WIN32
OptimizedMode();
#endif
random = new Random();
Console.WriteLine("Enter loop count:");
Console.WriteLine("999999");
string value = Console.ReadLine();
int count;
if (int.TryParse(value, out count))
{
runVector4Test(count);
}
else
{
Console.WriteLine("Invalide value: " + value);
}
#if WIN32
EndOptimizedMode();
#endif
Console.WriteLine("DONE");
Console.ReadLine();
}
static void runVector4Test(int count)
{
var values = new Vector4[count];
const double range = .01;
for (int i = 0; i != count; ++i)
{
values[i].X = (numf)(random.NextDouble() * range) + 1;
values[i].Y = (numf)(random.NextDouble() * range) + 1;
values[i].Z = (numf)(random.NextDouble() * range) + 1;
values[i].W = (numf)(random.NextDouble() * range) + 1;
}
Console.WriteLine("Waiting for GC...");
GC.Collect();
System.Threading.Thread.Sleep(5000);
Console.WriteLine("Starting Vector4 Test...");
var time = new Stopwatch();
long totalTime = 0;
Vector4 totalValue = new Vector4();
for (int i = 0; i != 100; ++i)
{
time.Restart();
for (int i2 = 0; i2 < count-1; ++i2)
{
Vector4 vec1 = values[i2];
Vector4 vec2 = values[i2+1];
totalValue += vec1;
totalValue -= vec2;
totalValue /= vec1;
totalValue *= vec2;
}
time.Stop();
totalTime += time.ElapsedMilliseconds;
}
Console.WriteLine("Vector4 Time: " + (totalTime / 100d));
Console.WriteLine("Vector4 Values: " + totalValue);
Console.WriteLine();
}
}
}
以下是结果：
<<< AMD Athlon 64 X2 Dual Core 4600+ 2.40GHz >>>
{
.NET 4.5 (Win8-Win32) = 39.9 mil
Mono 3.2.3 (Win8-Win32) = 99.49 mil
Mono 3.2.3 (PC-Linux) = 146.87 mil
Mono 3.2.1 (PC-BSD) = 144 mil
}
<<< Intel Core2 Duo P8600 2.40GHz >>>
{
Mono 3.2.3 (OSX 10.9) = 98.54 mil
.NET 4.5 (Win7-Win32) = 38.47 mil
}
为什么 Linux 和 BSD 上的 Mono 运行速度比 Windows 和 OSX 上的 Mono 慢 1/3？
