我想顯示我的多線程應用程序(使用多核處理器)的CPU使用率。我想要接近任務管理器的號碼。但是我的數字超過了100%。甚至超過500%。是的,我知道,比專櫃「%處理器時間」的類別「過程」我需要分成Environment.ProcessorCount或「NumberOfLogicalProcessors」(同爲我的配置)。並且在這個操作後500%是的結果。我在具有不同硬件(i7,i5,Core2)和軟件配置(包含所有更新的Windows 7 SP1,包含所有更新的Windows 2008 R2 SP1)的不同計算機上測試此示例,並得到同樣的問題。當前進程的性能計數器CPU使用率超過100
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; }
}
和代碼執行(你需要創建一個Windows窗體有兩個labeles,一個BackgroundWorker的和一鍵式應用程序)
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();
}
請告訴我我的錯誤。是的,我讀this article,發現
「\程序(......)\%處理器時間」可以達到N * 100(其中N是CPU的數目),因爲它增加了CPU的使用所有CPU的請求進程。
請不要複製你的漏洞代碼到問題中,只需要回答你的問題。當然,在你的代碼上留下一些評論。 – 2012-02-29 16:20:29