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

• Show log

  Commit

• 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>
  

Download

• src/tests/perf_tests/VulkanPipelineCachePerf.cpp

• //
  // Copyright 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.
  //
  // VulkanPipelineCachePerf:
  //   Performance benchmark for the Vulkan Pipeline cache.
  
  #include "ANGLEPerfTest.h"
  
  #include "libANGLE/renderer/vulkan/vk_cache_utils.h"
  #include "random_utils.h"
  
  using namespace rx;
  
  namespace
  {
  constexpr unsigned int kIterationsPerStep = 100;
  
  class VulkanPipelineCachePerfTest : public ANGLEPerfTest
  {
    public:
      VulkanPipelineCachePerfTest();
      ~VulkanPipelineCachePerfTest();
  
      void SetUp() override;
      void step() override;
  
      PipelineCache mCache;
      angle::RNG mRNG;
  
      std::vector<vk::PipelineDesc> mCacheHits;
      std::vector<vk::PipelineDesc> mCacheMisses;
      size_t mMissIndex = 0;
  
    private:
      void randomizeDesc(vk::PipelineDesc *desc);
  };
  
  VulkanPipelineCachePerfTest::VulkanPipelineCachePerfTest()
      : ANGLEPerfTest("VulkanPipelineCachePerf", "", kIterationsPerStep)
  {
  }
  
  VulkanPipelineCachePerfTest::~VulkanPipelineCachePerfTest()
  {
      mCache.destroy(VK_NULL_HANDLE);
  }
  
  void VulkanPipelineCachePerfTest::SetUp()
  {
      // Insert a number of random pipeline states.
      for (int pipelineCount = 0; pipelineCount < 100; ++pipelineCount)
      {
          vk::Pipeline pipeline;
          vk::PipelineDesc desc;
          randomizeDesc(&desc);
  
          if (pipelineCount < 10)
          {
              mCacheHits.push_back(desc);
          }
          mCache.populate(desc, std::move(pipeline));
      }
  
      for (int missCount = 0; missCount < 10000; ++missCount)
      {
          vk::PipelineDesc desc;
          randomizeDesc(&desc);
          mCacheMisses.push_back(desc);
      }
  }
  
  void VulkanPipelineCachePerfTest::randomizeDesc(vk::PipelineDesc *desc)
  {
      std::vector<uint8_t> bytes(sizeof(vk::PipelineDesc));
      FillVectorWithRandomUBytes(&mRNG, &bytes);
      memcpy(desc, bytes.data(), sizeof(vk::PipelineDesc));
  }
  
  void VulkanPipelineCachePerfTest::step()
  {
      vk::RenderPass rp;
      vk::PipelineLayout pl;
      vk::PipelineCache pc;
      vk::ShaderModule sm;
      vk::PipelineAndSerial *result = nullptr;
      gl::AttributesMask am;
  
      for (unsigned int iteration = 0; iteration < kIterationsPerStep; ++iteration)
      {
          for (const auto &hit : mCacheHits)
          {
              (void)mCache.getPipeline(VK_NULL_HANDLE, pc, rp, pl, am, sm, sm, hit, &result);
          }
      }
  
      for (int missCount = 0; missCount < 20 && mMissIndex < mCacheMisses.size();
           ++missCount, ++mMissIndex)
      {
          const auto &miss = mCacheMisses[mMissIndex];
          (void)mCache.getPipeline(VK_NULL_HANDLE, pc, rp, pl, am, sm, sm, miss, &result);
      }
  }
  
  }  // anonymous namespace
  
  TEST_F(VulkanPipelineCachePerfTest, Run)
  {
      run();
  }
  

Download