RandomBenchmark.cpp File Reference

#include <folly/Random.h>
#include <random>
#include <thread>
#include <glog/logging.h>
#include <folly/Benchmark.h>
#include <folly/container/Foreach.h>

Go to the source code of this file.

Functions
	BENCHMARK (minstdrand, n)
	BENCHMARK (mt19937, n)
	BENCHMARK (threadprng, n)
	BENCHMARK (RandomDouble)
	BENCHMARK (Random32)
	BENCHMARK (Random32Num)
	BENCHMARK (Random64)
	BENCHMARK (Random64Num)
	BENCHMARK (Random64OneIn)
int	main (int argc, char **argv)

Function Documentation

BENCHMARK	(	minstdrand	,
		n
	)

Definition at line 33 of file RandomBenchmark.cpp.

References folly::BenchmarkSuspender::dismiss(), folly::doNotOptimizeAway(), FOR_EACH_RANGE, i, rd, and rng.

                         {
  BenchmarkSuspender braces;
  std::random_device rd;
  std::minstd_rand rng(rd());

  braces.dismiss();

  FOR_EACH_RANGE (i, 0, n) { doNotOptimizeAway(rng()); }
}

BENCHMARK	(	mt19937	,
		n
	)

Definition at line 43 of file RandomBenchmark.cpp.

References folly::BENCHMARK(), folly::BenchmarkSuspender::dismiss(), folly::doNotOptimizeAway(), FOR_EACH_RANGE, i, rd, and rng.

                      {
  BenchmarkSuspender braces;
  std::random_device rd;
  std::mt19937 rng(rd());

  braces.dismiss();

  FOR_EACH_RANGE (i, 0, n) { doNotOptimizeAway(rng()); }
}

BENCHMARK	(	threadprng	,
		n
	)

Definition at line 65 of file RandomBenchmark.cpp.

References folly::BenchmarkSuspender::dismiss(), folly::doNotOptimizeAway(), FOR_EACH_RANGE, and i.

                         {
  BenchmarkSuspender braces;
  ThreadLocalPRNG tprng;
  tprng();

  braces.dismiss();

  FOR_EACH_RANGE (i, 0, n) { doNotOptimizeAway(tprng()); }
}

BENCHMARK

(

RandomDouble

)

Definition at line 75 of file RandomBenchmark.cpp.

References folly::doNotOptimizeAway(), and folly::Random::randDouble01().

                        {
  doNotOptimizeAway(Random::randDouble01());
}

BENCHMARK

(

Random32

)

Definition at line 78 of file RandomBenchmark.cpp.

References folly::doNotOptimizeAway(), and folly::Random::rand32().

                    {
  doNotOptimizeAway(Random::rand32());
}

BENCHMARK

(

Random32Num

)

Definition at line 81 of file RandomBenchmark.cpp.

References folly::doNotOptimizeAway(), and folly::Random::rand32().

                       {
  doNotOptimizeAway(Random::rand32(100));
}

BENCHMARK

(

Random64

)

Definition at line 84 of file RandomBenchmark.cpp.

References folly::doNotOptimizeAway(), and folly::Random::rand64().

                    {
  doNotOptimizeAway(Random::rand64());
}

BENCHMARK

(

Random64Num

)

Definition at line 87 of file RandomBenchmark.cpp.

References folly::doNotOptimizeAway(), and folly::Random::rand64().

                       {
  doNotOptimizeAway(Random::rand64(100ull << 32));
}

BENCHMARK

(

Random64OneIn

)

Definition at line 90 of file RandomBenchmark.cpp.

References folly::doNotOptimizeAway(), and folly::Random::oneIn().

                         {
  doNotOptimizeAway(Random::oneIn(100));
}

int main	(	int	argc,
		char **	argv
	)

Definition at line 94 of file RandomBenchmark.cpp.

References folly::runBenchmarks().

                                {
  gflags::ParseCommandLineFlags(&argc, &argv, true);
  folly::runBenchmarks();
  return 0;
}