获取c#方法的平均执行时间

Question

这个方法效果很好。但是我想知道是否有其他方法可以使这个方法更精确，我的最终目标是将同一个方法运行10次，并得到它的平均执行时间。

public static void Measure(Action action, int noOfTimesToRunThisMethod)
{
long averageTime = 0;
GC.Collect();  
GC.WaitForPendingFinalizers();    

Console.WriteLine("Started");
for (int i = 1; i <= noOfTimesToRunThisMethod; i++)
{
Stopwatch watch = Stopwatch.StartNew();              
action();
watch.Stop();
Console.WriteLine($"Attempt:{i.ToString("D2")} Time Taken:{watch.ElapsedMilliseconds} ms");
averageTime += watch.ElapsedMilliseconds;
}
Console.WriteLine($"Average: {averageTime/ noOfTimesToRunThisMethod}");
}

使用这个辅助方法

var noOfTimesToRunThisMethod = 10;

Utils.Measure(() => 
{  
MyMethod(arr)
},noOfTimesToRunThisMethod);

Answer 1

您可以使用Benchmark来测试您的执行方法时间。有一个Benchmark的例子:

public class Program
{
public static void Main()
{
BenchmarkRunner.Run<ListMemoryAllocationTest>();
}
}
[MemoryDiagnoser]
public class ListMemoryAllocationTest
{
public int Count { get; set; } = 900000;
[Benchmark]
public void DefaultConstructor()
{
List<int> numbers = new List<int>();
for (int i = 0; i < Count; i++)
{
numbers.Add(i);
}
}
[Benchmark]
public void AddCountToConstructor()
{  
List<int> secondNumbers = new List<int>(Count);
for (int i = 0; i < Count; i++)
{
secondNumbers.Add(i);
}
}
}

将项目配置从Build更改为Release并运行project.

结果:

|                Method |     Mean |    Error |   StdDev |    Gen 0 |    Gen 1 |    Gen 2 | Allocated |
|    DefaultConstructor | 753.4 us | 14.80 us | 15.20 us | 628.9063 | 627.9297 | 237.3047 |  1,024 KB |
| AddCountToConstructor | 499.6 us |  9.86 us | 17.78 us | 255.8594 | 255.8594 |  95.7031 |    391 KB |