2 * Copyright 2017 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/Random.h>
22 #include <glog/logging.h>
24 #include <folly/Benchmark.h>
25 #include <folly/Foreach.h>
27 #if FOLLY_HAVE_EXTRANDOM_SFMT19937
31 using namespace folly;
33 BENCHMARK(minstdrand, n) {
34 BenchmarkSuspender braces;
35 std::random_device rd;
36 std::minstd_rand rng(rd());
40 FOR_EACH_RANGE(i, 0, n) { doNotOptimizeAway(rng()); }
43 BENCHMARK(mt19937, n) {
44 BenchmarkSuspender braces;
45 std::random_device rd;
46 std::mt19937 rng(rd());
50 FOR_EACH_RANGE(i, 0, n) { doNotOptimizeAway(rng()); }
53 #if FOLLY_HAVE_EXTRANDOM_SFMT19937
54 BENCHMARK(sfmt19937, n) {
55 BenchmarkSuspender braces;
56 std::random_device rd;
57 __gnu_cxx::sfmt19937 rng(rd());
61 FOR_EACH_RANGE(i, 0, n) { doNotOptimizeAway(rng()); }
65 BENCHMARK(threadprng, n) {
66 BenchmarkSuspender braces;
67 ThreadLocalPRNG tprng;
72 FOR_EACH_RANGE(i, 0, n) { doNotOptimizeAway(tprng()); }
75 BENCHMARK(RandomDouble) { doNotOptimizeAway(Random::randDouble01()); }
76 BENCHMARK(Random32) { doNotOptimizeAway(Random::rand32()); }
77 BENCHMARK(Random32Num) { doNotOptimizeAway(Random::rand32(100)); }
78 BENCHMARK(Random64) { doNotOptimizeAway(Random::rand64()); }
79 BENCHMARK(Random64Num) { doNotOptimizeAway(Random::rand64(100ull << 32)); }
80 BENCHMARK(Random64OneIn) { doNotOptimizeAway(Random::oneIn(100)); }
82 int main(int argc, char** argv) {
83 gflags::ParseCommandLineFlags(&argc, &argv, true);
84 folly::runBenchmarks();