我想显示我的多线程应用程序的CPU使用情况(在多核处理器上工作).我想要接收任务管理员的数字.但我的数字超过100%.甚至超过500%.是的,我知道,除了“进程”类别的“%处理器时间”,我需要划分为Environment.ProcessorCount或“NumberOfLogicalProcessors”(与我的配置相同). 500%是此次操作后的结果.我在具有不同硬件(i7,i5,Core2)和软件配置(Windows 7 SP1与所有更新,Windows 2008 R2 SP1和所有更新)的不同计算机上测试了此示例,并遇到了同样的问题.
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; }
}
和代码执行(您需要使用两个标签创建Windows窗体应用程序,一个BackgroundWorker和一个按钮)
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,我读了this article,注意到了
“\Process(…)\% Processor Time” can go up to N*100 (where N is the number of CPUs) because it adds up the CPU usage of the requested process across all the CPUs.
This(有些相关)的问题表明使用System.Diagnostics.Process.TotalProcessorTime和System.Diagnostics.ProcessThread.TotalProcessorTime属性代替低开销和容易实现.
(编辑:Here’s an article解释如何使用属性,以及.)
此外,它看起来像在“_processTimeCounter.NextValue()”的调用之间不够等待.根据the documentation,你应该等待至少1秒钟.不知道是否会导致你的奇怪的数字.
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转载注明原文:c# – 性能计数器当前进程的CPU使用率超过100 - 代码日志