kc3-lang/angle/util/system_utils.h

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• Hash : 3402d523
  Author :
  Date : 2018-10-30T15:14:52
  

  Try to reduce variance in angle_perftests.
  
  This change does a few things:
  
  - make perf test runner script print % variation instead of stddev
  
  This makes it a bit more clear how much variance there is.
  
  - stabilize CPU in the render perf tests
  
  Setting a thread affinity and priority should stop from switching cores
  during the run. Hopefully can prevent background noise from changing
  the test results.
  
  - warm up the benchmark with a few iterations
  
  This should hopefully make the test results a bit more stable.
  
  - output a new normalized perf result value
  
  The new result is normalized against the number of iterations. So it
  should hopefully be stable even if the number of iterations is changed.
  
  - increases the iteration count in the draw call perf tests.
  
  These tests were completely dominated by SwapBuffers time. Increasing
  the iterations per step means we actually are bottlenecked on CPU time
  instead.
  
  Bug: angleproject:2923
  Change-Id: I5ee347cf93df239ac33b83dc5effe4c21e066736
  Reviewed-on: https://chromium-review.googlesource.com/c/1303679
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
  

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• util/system_utils.h

• //
  // Copyright (c) 2014 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.
  //
  
  // system_utils.h: declaration of OS-specific utility functions
  
  #ifndef UTIL_SYSTEM_UTILS_H_
  #define UTIL_SYSTEM_UTILS_H_
  
  #include <string>
  
  #include <export.h>
  
  #include "common/angleutils.h"
  #include "common/system_utils.h"
  
  namespace angle
  {
  
  // Cross platform equivalent of the Windows Sleep function
  ANGLE_EXPORT void Sleep(unsigned int milliseconds);
  
  ANGLE_EXPORT void SetLowPriorityProcess();
  
  // Write a debug message, either to a standard output or Debug window.
  ANGLE_EXPORT void WriteDebugMessage(const char *format, ...);
  
  // Set thread affinity and priority.
  ANGLE_EXPORT bool StabilizeCPUForBenchmarking();
  
  } // namespace angle
  
  #endif  // UTIL_SYSTEM_UTILS_H_
  

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