c# - "% Time in GC"性能计数器是什么意思

Question

我正在使用 perfcounter = "% Time in GC"

所以当我运行的时候

gcPerf.NextSample() 

我得到值 42.12273。

但我不明白这个值的单位是 (ms) 还是什么？

如果我想在 (ms) 内转换它，我该如何转换它？

这是全局代码

 string category = ".NET CLR Memory";
 string counter  = "% Time in GC";
 string instance = Process.GetCurrentProcess().ProcessName;
 PerformanceCounter gcPerf;

 // make sure the performance counter is available to query
 if (PerformanceCounterCategory.Exists(category) &&
     PerformanceCounterCategory.CounterExists(counter, category) &&
     PerformanceCounterCategory.InstanceExists(instance, category))
 {
    gcPerf = new PerformanceCounter(category, counter, instance);
 }

Answer 1

This is the percentage of the time spent in GC since the end of the last GC. For example, it’s been 1 million cycles since last GC ended and we spent 0.3 million cycles in the current GC, this counter will show 30%.

阅读this和 this .

What is a health value for this counter? It’s hard to say. It depends on what your app does. But if you are seeing a really high value (like 50% or more) then it’s a reasonable time to look at what’s going on inside of the managed heap. If this number is 10%, it’s probably better to look elsewhere in your app because even if you could get rid of half of that, you would only be saving 5% - most likely not very worthwhile.