以下文章来源于微信公众号DotNetCore实战
在 .NET Framework 中，很多人会用 PerformanceCounter 类做这件事情，
如下代码：
public class Program
{
public static void Main(string[] args)
{
while (true)
{
var cpuUsage = GetCpuUsageForProcess();
Console.WriteLine(cpuUsage);
}
}
private static int GetCpuUsageForProcess()
{
var currentProcessName = Process.GetCurrentProcess().ProcessName;
var cpuCounter = new PerformanceCounter("Process", "% Processor Time", currentProcessName);
cpuCounter.NextValue();
return (int)cpuCounter.NextValue();
}
}但 PerformanceCounter 在.NETCore 中是没有的，所以只能采用其他方式了，其实在 System.Diagnostics.Process 类中有一个 TotalProcessorTime 属性，它可以准实时的统计当前进程所消耗的CPU处理器时间，
如下代码：
class Program
{
public static async Task Main(string[] args)
{
var task = Task.Run(() => ConsumeCPU(50));
while (true)
{
await Task.Delay(2000);
var cpuUsage = await GetCpuUsageForProcess();
Console.WriteLine(cpuUsage);
}
}
public static void ConsumeCPU(int percentage)
{
Stopwatch watch = new Stopwatch();
watch.Start();
while (true)
{
if (watch.ElapsedMilliseconds > percentage)
{
Thread.Sleep(100 - percentage);
watch.Reset();
watch.Start();
}
}
}
private static async Task<double> GetCpuUsageForProcess()
{
var startTime = DateTime.UtcNow;
var startCpuUsage = Process.GetCurrentProcess().TotalProcessorTime;
await Task.Delay(500);
var endTime = DateTime.UtcNow;
var endCpuUsage = Process.GetCurrentProcess().TotalProcessorTime;
var cpuUsedMs = (endCpuUsage - startCpuUsage).TotalMilliseconds;
var totalMsPassed = (endTime - startTime).TotalMilliseconds;
var cpuUsageTotal = cpuUsedMs / (Environment.ProcessorCount * totalMsPassed);
return cpuUsageTotal * 100;
}
}
可以看到程序每2s输出一次，观察到 output 和 任务管理器 中的CPU利用率基本是一致的。
译文链接：https://medium.com/@jackwild/getting-cpu-usage-in-net-core-7ef825831b8b
