如何在 .NET Core 中獲取 CPU 使用率

這篇文章我們分享一種如何在 .NETCore 中獲取 CPU使用率的方法, 它所報告的這個值和 任務(wù)管理器 中報告的 CPU 使用值 差不多是一致的。

在 .NET Framework 中，很多人會用 PerformanceCounter 類做這件事情，參考如下代碼：

????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 中是沒有的，所以只能采用其他方式了，其實在 System.Diagnostics.Process 類中有一個 TotalProcessorTime 屬性，它可以準(zhǔn)實時的統(tǒng)計當(dāng)前進程所消耗的CPU處理器時間，參考如下代碼：

????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輸出一次，觀察到 output 和 任務(wù)管理器 中的CPU利用率基本是一致的。

譯文鏈接：https://medium.com/@jackwild/getting-cpu-usage-in-net-core-7ef825831b8b