c# - 为什么 cpu 性能计数器一直报告 0% cpu 使用率？

Question

PerformanceCounter cpuload = new PerformanceCounter();
cpuload.CategoryName = "Processor";
cpuload.CounterName = "% Processor Time";
cpuload.InstanceName = "_Total";
Console.WriteLine(cpuload.NextValue() + "%");

输出始终为 0%，而 cpuload.RawValue 为 736861484375 左右，NextValue() 发生了什么？

Answer 1

计数器的第一次迭代将始终为 0，因为它与最后一个值没有可比较的。试试这个:

var cpuload = new PerformanceCounter("Processor", "% Processor Time", "_Total");
Console.WriteLine(cpuload.NextValue() + "%");
Console.WriteLine(cpuload.NextValue() + "%");
Console.WriteLine(cpuload.NextValue() + "%");
Console.WriteLine(cpuload.NextValue() + "%");
Console.WriteLine(cpuload.NextValue() + "%");

然后你应该会看到一些数据出来了。它可以在常量图表或更新的场景中看到...这就是为什么您不会经常遇到此问题的原因。

这是 MSDN reference :

The method nextValue() always returns a 0 value on the first call. So you have to call this method a second time.