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[英]What is the correct Performance Counter to get CPU and Memory Usage of a Process?
[英]Performance counter CPU usage for current process is more than 100
我想显示我的多线程应用程序的CPU使用情况(通过多核处理器工作)。 我想收到接近任务管理器的号码。 但是我得到的数字超过100%。 甚至超过500%。 是的,我知道,我需要将计数器“类别”的计数器“%Processor Time”划分为Environment.ProcessorCount或“ NumberOfLogicalProcessors” (与我的配置相同)。 而此操作后的结果是500%。 我在具有不同硬件(i7,i5,Core2)和软件配置(具有所有更新的Windows 7 SP1,具有所有更新的Windows 2008 R2 SP1)的不同计算机上测试了此示例,并遇到了相同的问题。
public static class SystemInfo
{
private static Process _thisProc;
private static bool HasData = false;
private static PerformanceCounter _processTimeCounter;
private static void Init()
{
if (HasData)
return;
if (CheckForPerformanceCounterCategoryExist("Process"))
{
_processTimeCounter = new PerformanceCounter();
_processTimeCounter.CategoryName = "Process";
_processTimeCounter.CounterName = "% Processor Time";
_processTimeCounter.InstanceName = FindInstanceName("Process");
_processTimeCounter.NextValue();
}
MaximumCpuUsageForCurrentProcess = 0;
HasData = true;
}
private static bool CheckForPerformanceCounterCategoryExist(string categoryName)
{
return PerformanceCounterCategory.Exists(categoryName);
}
public static string FindInstanceName(string categoryName)
{
string result = String.Empty;
_thisProc = Process.GetCurrentProcess();
if (!ReferenceEquals(_thisProc, null))
{
if (!String.IsNullOrEmpty(categoryName))
{
if (CheckForPerformanceCounterCategoryExist(categoryName))
{
PerformanceCounterCategory category = new PerformanceCounterCategory(categoryName);
string[] instances = category.GetInstanceNames();
string processName = _thisProc.ProcessName;
if (instances != null)
{
foreach (string instance in instances)
{
if (instance.ToLower().Equals(processName.ToLower()))
{
result = instance;
break;
}
}
}
}
}
}
return result;
}
public static int CpuUsageForCurrentProcess
{
get
{
Init();
if (!ReferenceEquals(_processTimeCounter, null))
{
int result = (int) _processTimeCounter.NextValue();
result /= Environment.ProcessorCount; //NumberOfLogicalProcessors //same for me
if (MaximumCpuUsageForCurrentProcess < result)
MaximumCpuUsageForCurrentProcess = result;
return result;
}
return 0;
}
}
public static int MaximumCpuUsageForCurrentProcess { private set; get; }
}
和要执行的代码(您需要创建带有两个标签,一个BackgroundWorker和一个按钮的Windows窗体应用程序)
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
IList<Task> tasks = new List<Task>();
for (int i = 0; i < 10; i++)
{
Task t = new Task(() =>
{
do {
if (backgroundWorker1.CancellationPending)
break;
} while (true);
});
t.Start();
tasks.Add(t);
}
Task displayProgress = new Task(() => { do {
if (backgroundWorker1.CancellationPending)
break;
backgroundWorker1.ReportProgress(1);
Thread.Sleep(10);
} while (true); });
displayProgress.Start();
tasks.Add(displayProgress);
Task.WaitAll(tasks.ToArray());
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
label1.Text = SystemInfo.CpuUsageForCurrentProcess.ToString();
label2.Text = SystemInfo.MaximumCpuUsageForCurrentProcess.ToString();
}
private void button1_Click(object sender, EventArgs e)
{
label1.Text = SystemInfo.CpuUsageForCurrentProcess.ToString();
if (backgroundWorker1.IsBusy)
backgroundWorker1.CancelAsync();
else
backgroundWorker1.RunWorkerAsync();
}
请告诉我我的错误。 是的,我阅读了这篇文章,并注意到
“ \\ Process(…)\\%Processor Time”最多可以增加N * 100(其中N是CPU数量),因为它将所有CPU上请求的进程的CPU使用率相加。
这个 (有点相关)的问题建议改为使用System.Diagnostics.Process.TotalProcessorTime和System.Diagnostics.ProcessThread.TotalProcessorTime属性,以降低开销并易于实现。
另外,看起来您在两次调用“ _processTimeCounter.NextValue()”之间没有等待足够长的时间。 根据文档 ,您应该等待至少1秒钟。 不知道这是否会导致您的奇怪数字。
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