计算CPU使用率的更有效方法

Question

因此，我正在编写任务管理器克隆，现在我正在使用它来计算每个进程的CPU使用率％s。问题是这很慢;我只是想知道是否有办法加快这一点。

此外，我不允许使用PerformanceCounter的方法和/或WMI。

//Omitted: 
// - Process[] processes just holds the currently running processes 
// - rows[] is a list of the rows I have in a table which shows the tables data 
// - rows[2] is the column for CPU usage 
// - rows[0] is the column for PID 
//======== 
//Do CPU usages 
double totalCPUTime = 0; 
foreach (Process p in processes) 
{ 
    try 
    { 
     totalCPUTime += p.TotalProcessorTime.TotalMilliseconds; 
    } 
    catch (System.ComponentModel.Win32Exception e) 
    { 
     //Some processes do not give access rights to view their time. 
    } 
} 
foreach (Process p in processes) 
{ 
    double millis = 0; 
    try 
    { 
     millis = p.TotalProcessorTime.TotalMilliseconds; 
    } 
    catch (System.ComponentModel.Win32Exception e) 
    { 
     //Some processes do not give access rights to view their time. 
    } 
    double pct = 100 * millis/totalCPUTime; 
    for (int i = 0; i < rows.Count; i++) 
    { 
     if(rows[i].Cells[0].Value.Equals(p.Id)) 
     { 
      rows[i].Cells[2].Value = pct; 
      break; 
     } 
    } 
} 

Answer 1

使用PerformanceCounter组件来获得不同的性能统计数据：

var cpuCounter = new PerformanceCounter("Process", "% Processor Time", p.ProcessName); 
double value = cpuCounter.NextValue();  

而且here是创建类似任务管理器的样品。

还可以考虑使用Win API函数GetProcessTimes。