kc3-lang/angle/util/Timer.cpp

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• Hash : e9f9fa17
  Author :
  Date : 2021-11-09T18:13:15
  

  Add cpu time measurement to perf tests
  
  Bug: angleproject:6667
  Change-Id: I16570a7b51d363dd1c0f35789b985520cb76d488
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3270601
  Commit-Queue: Lingfeng Yang <lfy@google.com>
  Reviewed-by: Tim Van Patten <timvp@google.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Charlie Lao <cclao@google.com>
  

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• util/Timer.cpp

• //
  // Copyright 2019 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // Timer.cpp: Implementation of a high precision timer class.
  //
  
  #include "util/Timer.h"
  
  #include "common/system_utils.h"
  
  Timer::Timer() : mRunning(false), mStartTime(0), mStopTime(0) {}
  
  void Timer::start()
  {
      mStartTime    = angle::GetCurrentSystemTime();
      mStartCpuTime = angle::GetCurrentProcessCpuTime();
      mRunning      = true;
  }
  
  void Timer::stop()
  {
      mStopTime    = angle::GetCurrentSystemTime();
      mStopCpuTime = angle::GetCurrentProcessCpuTime();
      mRunning     = false;
  }
  
  double Timer::getElapsedWallClockTime() const
  {
      double endTime;
      if (mRunning)
      {
          endTime = angle::GetCurrentSystemTime();
      }
      else
      {
          endTime = mStopTime;
      }
  
      return endTime - mStartTime;
  }
  
  double Timer::getElapsedCpuTime() const
  {
      double endTime;
      if (mRunning)
      {
          endTime = angle::GetCurrentProcessCpuTime();
      }
      else
      {
          endTime = mStopCpuTime;
      }
  
      return endTime - mStartCpuTime;
  }
  

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