moel@26: /* moel@26: moel@26: Version: MPL 1.1/GPL 2.0/LGPL 2.1 moel@26: moel@26: The contents of this file are subject to the Mozilla Public License Version moel@26: 1.1 (the "License"); you may not use this file except in compliance with moel@26: the License. You may obtain a copy of the License at moel@26: moel@26: http://www.mozilla.org/MPL/ moel@26: moel@26: Software distributed under the License is distributed on an "AS IS" basis, moel@26: WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License moel@26: for the specific language governing rights and limitations under the License. moel@26: moel@26: The Original Code is the Open Hardware Monitor code. moel@26: moel@26: The Initial Developer of the Original Code is moel@26: Michael Möller . moel@26: Portions created by the Initial Developer are Copyright (C) 2009-2010 moel@26: the Initial Developer. All Rights Reserved. moel@26: moel@26: Contributor(s): moel@26: moel@26: Alternatively, the contents of this file may be used under the terms of moel@26: either the GNU General Public License Version 2 or later (the "GPL"), or moel@26: the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), moel@26: in which case the provisions of the GPL or the LGPL are applicable instead moel@26: of those above. If you wish to allow use of your version of this file only moel@26: under the terms of either the GPL or the LGPL, and not to allow others to moel@26: use your version of this file under the terms of the MPL, indicate your moel@26: decision by deleting the provisions above and replace them with the notice moel@26: and other provisions required by the GPL or the LGPL. If you do not delete moel@26: the provisions above, a recipient may use your version of this file under moel@26: the terms of any one of the MPL, the GPL or the LGPL. moel@26: moel@26: */ moel@26: moel@26: using System; moel@26: using System.Collections.Generic; moel@26: using System.Runtime.InteropServices; moel@26: using System.Text; moel@26: moel@26: namespace OpenHardwareMonitor.Hardware.CPU { moel@26: public class CPULoad { moel@26: moel@26: [StructLayout(LayoutKind.Sequential)] moel@26: private struct SystemProcessorPerformanceInformation { moel@26: public long IdleTime; moel@26: public long KernelTime; moel@26: public long UserTime; moel@26: public long Reserved0; moel@26: public long Reserved1; moel@26: public ulong Reserved2; moel@26: } moel@26: moel@26: private enum SystemInformationClass : int { moel@26: SystemBasicInformation = 0, moel@26: SystemCpuInformation = 1, moel@26: SystemPerformanceInformation = 2, moel@26: SystemTimeOfDayInformation = 3, moel@26: SystemProcessInformation = 5, moel@26: SystemProcessorPerformanceInformation = 8 moel@26: } moel@26: moel@26: [DllImport("ntdll.dll")] moel@26: private static extern int NtQuerySystemInformation( moel@26: SystemInformationClass informationClass, moel@26: [Out] SystemProcessorPerformanceInformation[] informations, moel@26: int structSize, out IntPtr returnLength); moel@26: moel@26: private uint coreCount; moel@26: private uint logicalProcessorsPerCore; moel@26: moel@26: private long systemTime; moel@26: private long[] idleTimes; moel@26: moel@26: private float totalLoad; moel@26: private float[] coreLoads; moel@26: moel@26: private bool available = false; moel@26: moel@26: private long[] GetIdleTimes() { moel@26: long[] result = new long[coreCount * logicalProcessorsPerCore]; moel@26: SystemProcessorPerformanceInformation[] informations = new moel@26: SystemProcessorPerformanceInformation[result.Length]; moel@26: moel@26: IntPtr returnLength; moel@26: NtQuerySystemInformation( moel@26: SystemInformationClass.SystemProcessorPerformanceInformation, moel@26: informations, informations.Length * moel@26: Marshal.SizeOf(typeof(SystemProcessorPerformanceInformation)), moel@26: out returnLength); moel@26: moel@26: for (int i = 0; i < result.Length; i++) moel@26: result[i] = informations[i].IdleTime; moel@26: moel@26: return result; moel@26: } moel@26: moel@26: public CPULoad(uint coreCount, uint logicalProcessorsPerCore) { moel@26: this.coreCount = coreCount; moel@26: this.logicalProcessorsPerCore = logicalProcessorsPerCore; moel@26: this.coreLoads = new float[coreCount]; moel@26: this.systemTime = DateTime.Now.Ticks; moel@26: this.totalLoad = 0; moel@26: try { moel@26: this.idleTimes = GetIdleTimes(); moel@26: } catch (Exception) { moel@26: this.idleTimes = null; moel@26: } moel@26: if (idleTimes != null) moel@26: available = true; moel@26: } moel@26: moel@26: public bool IsAvailable { moel@26: get { return available; } moel@26: } moel@26: moel@26: public float GetTotalLoad() { moel@26: return totalLoad; moel@26: } moel@26: moel@26: public float GetCoreLoad(int core) { moel@26: return coreLoads[core]; moel@26: } moel@26: moel@26: public void Update() { moel@26: if (this.idleTimes == null) moel@26: return; moel@26: moel@26: long systemTime = DateTime.Now.Ticks; moel@26: long[] idleTimes = GetIdleTimes(); moel@26: moel@26: if (systemTime - this.systemTime < 10000) moel@26: return; moel@26: moel@26: float total = 0; moel@26: for (int i = 0; i < coreCount; i++) { moel@26: float value = 0; moel@26: for (int j = 0; j < logicalProcessorsPerCore; j++) { moel@26: long index = i * logicalProcessorsPerCore + j; moel@26: long delta = idleTimes[index] - this.idleTimes[index]; moel@26: value += delta; moel@26: total += delta; moel@26: } moel@26: value = 1.0f - value / (logicalProcessorsPerCore * moel@26: (systemTime - this.systemTime)); moel@26: value = value < 0 ? 0 : value; moel@26: coreLoads[i] = value * 100; moel@26: } moel@26: total = 1.0f - total / (coreCount * logicalProcessorsPerCore * moel@26: (systemTime - this.systemTime)); moel@26: total = total < 0 ? 0 : total; moel@26: this.totalLoad = total * 100; moel@26: moel@26: this.systemTime = systemTime; moel@26: this.idleTimes = idleTimes; moel@26: } moel@26: moel@26: } moel@26: }