kc3-lang/angle/src/tests/perf_tests/DispatchComputePerf.cpp

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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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• src/tests/perf_tests/DispatchComputePerf.cpp

• //
  // Copyright (c) 2018 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.
  //
  // DispatchComputePerf:
  //   Performance tests for ANGLE DispatchCompute call overhead.
  //
  
  #include "ANGLEPerfTest.h"
  #include "shader_utils.h"
  
  namespace
  {
  unsigned int kIterationsPerStep = 50;
  
  struct DispatchComputePerfParams final : public RenderTestParams
  {
      DispatchComputePerfParams()
      {
          iterationsPerStep = kIterationsPerStep;
          majorVersion = 3;
          minorVersion = 1;
      }
  
      std::string suffix() const override;
  
      unsigned int localSizeX    = 16;
      unsigned int localSizeY    = 16;
      unsigned int textureWidth  = 32;
      unsigned int textureHeight = 32;
  };
  
  std::string DispatchComputePerfParams::suffix() const
  {
      std::stringstream suffixStr;
      suffixStr << RenderTestParams::suffix();
  
      if (eglParameters.deviceType == EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE)
      {
          suffixStr << "_null";
      }
      return suffixStr.str();
  }
  
  std::ostream &operator<<(std::ostream &os, const DispatchComputePerfParams &params)
  {
      os << params.suffix().substr(1);
      return os;
  }
  
  class DispatchComputePerfBenchmark : public ANGLERenderTest,
                                       public ::testing::WithParamInterface<DispatchComputePerfParams>
  {
    public:
      DispatchComputePerfBenchmark();
  
      void initializeBenchmark() override;
      void destroyBenchmark() override;
      void drawBenchmark() override;
  
    private:
      void initComputeShader();
      void initTextures();
  
      GLuint mProgram      = 0;
      GLuint mReadTexture  = 0;
      GLuint mWriteTexture = 0;
      GLuint mDispatchX    = 0;
      GLuint mDispatchY    = 0;
  };
  
  DispatchComputePerfBenchmark::DispatchComputePerfBenchmark()
      : ANGLERenderTest("DispatchComputePerf", GetParam())
  {
  }
  
  void DispatchComputePerfBenchmark::initializeBenchmark()
  {
      const auto &params = GetParam();
  
      initComputeShader();
      initTextures();
  
      glUseProgram(mProgram);
      glActiveTexture(GL_TEXTURE0);
      glBindTexture(GL_TEXTURE_2D, mReadTexture);
      glUniform1i(glGetUniformLocation(mProgram, "readTexture"), 0);
      glBindImageTexture(4, mWriteTexture, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R32F);
  
      mDispatchX = params.textureWidth / params.localSizeX;
      mDispatchY = params.textureHeight / params.localSizeY;
      ASSERT_GL_NO_ERROR();
  }
  
  void DispatchComputePerfBenchmark::initComputeShader()
  {
      const std::string &csSource =
          R"(#version 310 es
          #define LOCAL_SIZE_X 16
          #define LOCAL_SIZE_Y 16
          layout(local_size_x=LOCAL_SIZE_X, local_size_y=LOCAL_SIZE_Y) in;
          precision highp float;
          uniform sampler2D readTexture;
          layout(r32f, binding = 4) writeonly uniform highp image2D  outImage;
  
          void main() {
              float sum = 0.;
              sum += texelFetch(readTexture, ivec2(gl_GlobalInvocationID.xy), 0).r;
              imageStore(outImage, ivec2(gl_GlobalInvocationID.xy), vec4(sum));
          })";
  
      mProgram = CompileComputeProgram(csSource, false);
      ASSERT_NE(0u, mProgram);
  }
  
  void DispatchComputePerfBenchmark::initTextures()
  {
      const auto &params = GetParam();
  
      unsigned int textureDataSize = params.textureWidth * params.textureHeight;
      std::vector<GLfloat> textureInputData(textureDataSize, 0.2f);
      std::vector<GLfloat> textureOutputData(textureDataSize, 0.1f);
  
      glGenTextures(1, &mReadTexture);
      glBindTexture(GL_TEXTURE_2D, mReadTexture);
      glTexImage2D(GL_TEXTURE_2D, 0, GL_R32F, params.textureWidth, params.textureHeight, 0, GL_RED,
                   GL_FLOAT, textureInputData.data());
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  
      glGenTextures(1, &mWriteTexture);
      glBindTexture(GL_TEXTURE_2D, mWriteTexture);
      glTexStorage2D(GL_TEXTURE_2D, 1, GL_R32F, params.textureWidth, params.textureHeight);
      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, params.textureWidth, params.textureHeight, GL_RED,
                      GL_FLOAT, textureOutputData.data());
      ASSERT_GL_NO_ERROR();
  }
  
  void DispatchComputePerfBenchmark::destroyBenchmark()
  {
      glDeleteProgram(mProgram);
      glDeleteTextures(1, &mReadTexture);
      glDeleteTextures(1, &mWriteTexture);
  }
  
  void DispatchComputePerfBenchmark::drawBenchmark()
  {
      const auto &params = GetParam();
      for (unsigned int it = 0; it < params.iterationsPerStep; it++)
      {
          glDispatchCompute(mDispatchX, mDispatchY, 1);
          glMemoryBarrier(GL_TEXTURE_UPDATE_BARRIER_BIT);
      }
      ASSERT_GL_NO_ERROR();
  }
  
  DispatchComputePerfParams DispatchComputePerfOpenGLOrGLESParams(bool useNullDevice)
  {
      DispatchComputePerfParams params;
      params.eglParameters = angle::egl_platform::OPENGL_OR_GLES(useNullDevice);
      return params;
  }
  
  TEST_P(DispatchComputePerfBenchmark, Run)
  {
      run();
  }
  
  ANGLE_INSTANTIATE_TEST(DispatchComputePerfBenchmark,
                         DispatchComputePerfOpenGLOrGLESParams(true),
                         DispatchComputePerfOpenGLOrGLESParams(false));
  
  }  // namespace
  

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