关于性能：C＃方法 – 调用比代码更快

C# Method-Call faster than just code

我想通过将代码放入方法而不是仅仅调用它来测试浪费了多少时间。

令我惊讶的是，方法调用更快，我问自己：为什么？

这是代码：hobjects是图像处理库"halcon"的一部分，在方法调用中通常与"out"一起使用，因此不要担心可怕的外观；-)

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static void Main(string[] args)
{
int runs = 900000;
HObject hob1;
HObject hob2;
HObject hob3;
HObject hob4;
HObject hob5;
HObject hob6;

DateTime t1 = DateTime.Now;

for ( int i = 0; i < runs; i++ )
{
doItMethod(out hob1, out hob2, out hob3, out hob4, out hob5, out hob6);
}

TimeSpan ts1 = TimeSpan.FromTicks(DateTime.Now.Ticks - t1.Ticks);

DateTime t2 = DateTime.Now;

for ( int i = 0; i < runs; i++ )
{
HOperatorSet.GenEmptyObj(out hob1);
HOperatorSet.GenEmptyObj(out hob2);
HOperatorSet.GenEmptyObj(out hob3);
HOperatorSet.GenEmptyObj(out hob4);
HOperatorSet.GenEmptyObj(out hob5);
HOperatorSet.GenEmptyObj(out hob6);

hob1.Dispose();
hob2.Dispose();
hob3.Dispose();
hob4.Dispose();
hob5.Dispose();
hob6.Dispose();
}

TimeSpan ts2 = TimeSpan.FromTicks(DateTime.Now.Ticks - t2.Ticks);

Console.WriteLine("Zeitspanne Methodenaufruf :" + ts1.TotalMilliseconds.ToString());
Console.WriteLine("Zeitspanne direkter Aufruf:" + ts2.TotalMilliseconds.ToString());

Console.ReadKey();
}

static void doItMethod(out HObject hobOut1, out HObject hobOut2, out HObject hobOut3, out HObject hobOut4, out HObject hobOut5, out HObject hobOut6)
{
HOperatorSet.GenEmptyObj(out hobOut1);
HOperatorSet.GenEmptyObj(out hobOut2);
HOperatorSet.GenEmptyObj(out hobOut3);
HOperatorSet.GenEmptyObj(out hobOut4);
HOperatorSet.GenEmptyObj(out hobOut5);
HOperatorSet.GenEmptyObj(out hobOut6);

hobOut1.Dispose();
hobOut2.Dispose();
hobOut3.Dispose();
hobOut4.Dispose();
hobOut5.Dispose();
hobOut6.Dispose();
}

相关讨论

你应该用秒表

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//add using System.Diagnostics;

public static void Main()
{
int runs = 900000;
HObject hob1;
HObject hob2;
HObject hob3;
HObject hob4;
HObject hob5;
HObject hob6;

Stopwatch t1 = new Stopwatch();

t1.Start();

for ( int i = 0; i < runs; i++ )
{
doItMethod(out hob1, out hob2, out hob3, out hob4, out hob5, out hob6);
}

t1.Stop();

Stopwatch t2 = new Stopwatch();
t2.Start();

for ( int i = 0; i < runs; i++ )
{
HOperatorSet.GenEmptyObj(out hob1);
HOperatorSet.GenEmptyObj(out hob2);
HOperatorSet.GenEmptyObj(out hob3);
HOperatorSet.GenEmptyObj(out hob4);
HOperatorSet.GenEmptyObj(out hob5);
HOperatorSet.GenEmptyObj(out hob6);

hob1.Dispose();
hob2.Dispose();
hob3.Dispose();
hob4.Dispose();
hob5.Dispose();
hob6.Dispose();
}
t2.Stop();

Console.WriteLine("Zeitspanne Methodenaufruf :" + t1.ElapsedMilliseconds);
Console.WriteLine("Zeitspanne direkter Aufruf:" + t2.ElapsedMilliseconds);

Console.ReadKey();
}

谢谢大家！我得到了答案。

正如尤金·里克怀疑的那样，这是一个GC伪制品。

强制垃圾收集使方法调用版本比直接代码慢。

我用秒表得到了正确的结果：

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Method: 00:00:04.5573170
Code: 00:00:04.5539918

static void Main(string[] args)
{
int runs = 1000;
HObject hob1;
HObject hob2;
HObject hob3;
HObject hob4;
HObject hob5;
HObject hob6;

Stopwatch sw = new Stopwatch();
sw.Start();

for (int i = 0; i < runs; i++)
{
doItMethod(out hob1, out hob2, out hob3, out hob4, out hob5, out hob6);
}

sw.Stop();
Console.WriteLine(sw.Elapsed);

sw = Stopwatch.StartNew();

for (int i = 0; i < runs; i++)
{
HOperatorSet.GenEmptyObj(out hob1);
HOperatorSet.GenEmptyObj(out hob2);
HOperatorSet.GenEmptyObj(out hob3);
HOperatorSet.GenEmptyObj(out hob4);
HOperatorSet.GenEmptyObj(out hob5);
HOperatorSet.GenEmptyObj(out hob6);

hob1.Dispose();
hob2.Dispose();
hob3.Dispose();
hob4.Dispose();
hob5.Dispose();
hob6.Dispose();
}

sw.Stop();
Console.WriteLine(sw.Elapsed);

Console.ReadKey();
}