124 lines
3.8 KiB
C#
124 lines
3.8 KiB
C#
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
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// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// Copyright (C) LibreHardwareMonitor and Contributors.
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// Partial Copyright (C) Michael Möller <mmoeller@openhardwaremonitor.org> and Contributors.
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// All Rights Reserved.
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using System;
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using System.Linq;
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using System.Runtime.InteropServices;
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namespace LibreHardwareMonitor.Hardware.CPU
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{
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internal class CpuLoad
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{
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private readonly CpuId[][] _cpuid;
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private long[] _idleTimes;
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private readonly float[] _threadLoads;
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private float _totalLoad;
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private long[] _totalTimes;
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public CpuLoad(CpuId[][] cpuid)
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{
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_cpuid = cpuid;
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_threadLoads = new float[cpuid.Sum(x => x.Length)];
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_totalLoad = 0;
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try
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{
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GetTimes(out _idleTimes, out _totalTimes);
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}
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catch (Exception)
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{
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_idleTimes = null;
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_totalTimes = null;
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}
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if (_idleTimes != null)
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IsAvailable = true;
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}
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public bool IsAvailable { get; }
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private static bool GetTimes(out long[] idle, out long[] total)
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{
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Interop.NtDll.SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION[] information = new Interop.NtDll.SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION[64];
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int size = Marshal.SizeOf(typeof(Interop.NtDll.SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION));
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idle = null;
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total = null;
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if (Interop.NtDll.NtQuerySystemInformation(Interop.NtDll.SYSTEM_INFORMATION_CLASS.SystemProcessorPerformanceInformation,
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information,
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information.Length * size,
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out IntPtr returnLength) != 0)
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{
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return false;
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}
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idle = new long[(int)returnLength / size];
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total = new long[(int)returnLength / size];
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for (int i = 0; i < idle.Length; i++)
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{
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idle[i] = information[i].IdleTime;
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total[i] = information[i].KernelTime + information[i].UserTime;
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}
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return true;
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}
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public float GetTotalLoad()
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{
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return _totalLoad;
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}
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public float GetThreadLoad(int thread)
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{
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return _threadLoads[thread];
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}
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public void Update()
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{
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if (_idleTimes == null)
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return;
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if (!GetTimes(out long[] newIdleTimes, out long[] newTotalTimes))
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return;
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for (int i = 0; i < Math.Min(newTotalTimes.Length, _totalTimes.Length); i++)
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{
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if (newTotalTimes[i] - _totalTimes[i] < 100000)
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return;
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}
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if (newIdleTimes == null)
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return;
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float total = 0;
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int count = 0;
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for (int i = 0; i < _threadLoads.Length && i < _idleTimes.Length && i < newIdleTimes.Length; i++)
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{
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float idle = (newIdleTimes[i] - _idleTimes[i]) / (float)(newTotalTimes[i] - _totalTimes[i]);
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_threadLoads[i] = 100f * (1.0f - Math.Min(idle, 1.0f));
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total += idle;
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count++;
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}
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if (count > 0)
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{
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total = 1.0f - total / count;
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total = total < 0 ? 0 : total;
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}
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else
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{
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total = 0;
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}
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_totalLoad = total * 100;
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_totalTimes = newTotalTimes;
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_idleTimes = newIdleTimes;
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}
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}
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}
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