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POWrong calculated CPU usage using C# and WMI
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copied!<p>This is my function for enumerating processes on windows box and calculating percentage of CPU usage for each process but results are not correct.</p> <p>CPU usage does't add up to 100% but more like to 120% or 130% and I don't know what I'm doing wrong. It seems like it calculats right CPU usage for varoius apps like firefox, VS2010, office,.. but has problems with System Idle Process. </p> <pre><code>public List<ProcInfo> GetRunningProcesses() { List<ProcInfo> allProcesses = new List<ProcInfo>(); UInt64 currentProcessCpuTime = 0; UInt64 allProcessCpuTime = 0; SelectQuery wmiQuery = new SelectQuery("SELECT Name, Description, ProcessId, KernelModeTime, UserModeTime FROM Win32_Process"); ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(connectionScope, wmiQuery); ManagementObjectCollection moc = oSearcher.Get(); foreach (ManagementObject mo in moc) { allProcessCpuTime += (UInt64)mo["KernelModeTime"] + (UInt64)mo["UserModeTime"]; } foreach (ManagementObject mo in moc) { currentProcessCpuTime = (UInt64)mo["KernelModeTime"] + (UInt64)mo["UserModeTime"]; allProcesses.Add(new ProcInfo((string)mo["Name"], (string)mo["Description"], (UInt32)mo["ProcessId"], (currentProcessCpuTime / (double)allProcessCpuTime * 100)); } return allProcesses; } </code></pre> <p><strong>EDIT:</strong></p> <p>I found that my function is all wrong. </p> <p>I'm starting a bounty for the best working solution. Solution needs to work for local and remote system and should be fast. </p>

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