hist_benchmark_engine.cxx

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#include <ROOT/RHistEngine.hxx>
#include <ROOT/RRegularAxis.hxx>
 
#include <benchmark/benchmark.h>
 
#include <random>
#include <vector>
 
struct RHistEngine_int_Regular1 : public benchmark::Fixture {
   // The objects are stored and constructed in the fixture to avoid compiler optimizations in the benchmark body taking
   // advantage of the (constant) constructor parameters.
   ROOT::Experimental::RRegularAxis axis{20, 0.0, 1.0};
   ROOT::Experimental::RHistEngine<int> engine{{axis}};
   std::vector<double> fNumbers;
 
   // Avoid GCC warning
   using benchmark::Fixture::SetUp;
   void SetUp(benchmark::State &state) final
   {
      std::mt19937 gen;
      std::uniform_real_distribution<> dis;
      fNumbers.resize(state.range(0));
      for (std::size_t i = 0; i < fNumbers.size(); i++) {
         fNumbers[i] = dis(gen);
      }
   }
};
 
BENCHMARK_DEFINE_F(RHistEngine_int_Regular1, Fill)(benchmark::State &state)
{
   for (auto _ : state) {
      for (double number : fNumbers) {
         engine.Fill(number);
      }
   }
}
BENCHMARK_REGISTER_F(RHistEngine_int_Regular1, Fill)->Range(0, 32768);
 
struct RHistEngine_int_Regular2 : public benchmark::Fixture {
   // The objects are stored and constructed in the fixture to avoid compiler optimizations in the benchmark body taking
   // advantage of the (constant) constructor parameters.
   ROOT::Experimental::RRegularAxis axis{20, 0.0, 1.0};
   ROOT::Experimental::RHistEngine<int> engine{{axis, axis}};
   std::vector<double> fNumbers;
 
   // Avoid GCC warning
   using benchmark::Fixture::SetUp;
   void SetUp(benchmark::State &state) final
   {
      std::mt19937 gen;
      std::uniform_real_distribution<> dis;
      fNumbers.resize(2 * state.range(0));
      for (std::size_t i = 0; i < fNumbers.size(); i++) {
         fNumbers[i] = dis(gen);
      }
   }
};
 
BENCHMARK_DEFINE_F(RHistEngine_int_Regular2, Fill)(benchmark::State &state)
{
   for (auto _ : state) {
      for (std::size_t i = 0; i < fNumbers.size(); i += 2) {
         engine.Fill(fNumbers[i], fNumbers[i + 1]);
      }
   }
}
BENCHMARK_REGISTER_F(RHistEngine_int_Regular2, Fill)->Range(0, 32768);
 
BENCHMARK_MAIN();