2 * Copyright 2015-present 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.
16 /* -*- Mode: C++; tab-width: 2; c-basic-offset: 2; indent-tabs-mode: nil -*- */
18 #include <folly/experimental/ReadMostlySharedPtr.h>
23 #include <folly/Benchmark.h>
24 #include <folly/Memory.h>
25 #include <folly/experimental/RCURefCount.h>
26 #include <folly/portability/GFlags.h>
29 template <typename> class MainPtr,
30 template <typename> class WeakPtr,
32 void benchmark(size_t n) {
33 MainPtr<int> mainPtr(std::make_unique<int>(42));
35 std::vector<std::thread> ts;
37 for (size_t t = 0; t < threadCount; ++t) {
38 ts.emplace_back([&]() {
39 WeakPtr<int> weakPtr(mainPtr);
40 // Prevent the compiler from hoisting code out of the loop.
41 auto op = [&]() FOLLY_NOINLINE { weakPtr.lock(); };
43 for (size_t i = 0; i < n; ++i) {
55 using RCUMainPtr = folly::ReadMostlyMainPtr<T, folly::RCURefCount>;
57 using RCUWeakPtr = folly::ReadMostlyWeakPtr<T, folly::RCURefCount>;
59 using TLMainPtr = folly::ReadMostlyMainPtr<T, folly::TLRefCount>;
61 using TLWeakPtr = folly::ReadMostlyWeakPtr<T, folly::TLRefCount>;
64 BENCHMARK(WeakPtrOneThread, n) {
65 benchmark<std::shared_ptr, std::weak_ptr, 1>(n);
68 BENCHMARK(WeakPtrFourThreads, n) {
69 benchmark<std::shared_ptr, std::weak_ptr, 4>(n);
72 BENCHMARK(RCUReadMostlyWeakPtrOneThread, n) {
73 benchmark<RCUMainPtr, RCUWeakPtr, 1>(n);
76 BENCHMARK(RCUReadMostlyWeakPtrFourThreads, n) {
77 benchmark<RCUMainPtr, RCUWeakPtr, 4>(n);
80 BENCHMARK(TLReadMostlyWeakPtrOneThread, n) {
81 benchmark<TLMainPtr, TLWeakPtr, 1>(n);
84 BENCHMARK(TLReadMostlyWeakPtrFourThreads, n) {
85 benchmark<TLMainPtr, TLWeakPtr, 4>(n);
88 int main(int argc, char** argv) {
89 gflags::ParseCommandLineFlags(&argc, &argv, true);
90 gflags::SetCommandLineOptionWithMode(
91 "bm_min_usec", "100000", gflags::SET_FLAG_IF_DEFAULT
94 folly::runBenchmarks();