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- /*
- * Copyright 2014-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include <folly/ExceptionWrapper.h>
- #include <atomic>
- #include <exception>
- #include <stdexcept>
- #include <thread>
- #include <vector>
- #include <folly/Benchmark.h>
- #include <folly/portability/GFlags.h>
- DEFINE_int32(
- num_threads,
- 32,
- "Number of threads to run concurrency "
- "benchmarks");
- /*
- * Use case 1: Library wraps errors in either exception_wrapper or
- * exception_ptr, but user does not care what the exception is after learning
- * that there is one.
- */
- BENCHMARK(exception_ptr_create_and_test, iters) {
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ep = std::make_exception_ptr(e);
- bool b = static_cast<bool>(ep);
- folly::doNotOptimizeAway(b);
- }
- }
- BENCHMARK_RELATIVE(exception_wrapper_create_and_test, iters) {
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ew = folly::make_exception_wrapper<std::runtime_error>(e);
- bool b = static_cast<bool>(ew);
- folly::doNotOptimizeAway(b);
- }
- }
- BENCHMARK_DRAW_LINE();
- BENCHMARK(exception_ptr_create_and_test_concurrent, iters) {
- std::atomic<bool> go(false);
- std::vector<std::thread> threads;
- BENCHMARK_SUSPEND {
- for (int t = 0; t < FLAGS_num_threads; ++t) {
- threads.emplace_back([&go, iters] {
- while (!go) {
- }
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ep = std::make_exception_ptr(e);
- bool b = static_cast<bool>(ep);
- folly::doNotOptimizeAway(b);
- }
- });
- }
- }
- go.store(true);
- for (auto& t : threads) {
- t.join();
- }
- }
- BENCHMARK_RELATIVE(exception_wrapper_create_and_test_concurrent, iters) {
- std::atomic<bool> go(false);
- std::vector<std::thread> threads;
- BENCHMARK_SUSPEND {
- for (int t = 0; t < FLAGS_num_threads; ++t) {
- threads.emplace_back([&go, iters] {
- while (!go) {
- }
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ew = folly::make_exception_wrapper<std::runtime_error>(e);
- bool b = static_cast<bool>(ew);
- folly::doNotOptimizeAway(b);
- }
- });
- }
- }
- go.store(true);
- for (auto& t : threads) {
- t.join();
- }
- }
- BENCHMARK_DRAW_LINE();
- /*
- * Use case 2: Library wraps errors in either exception_wrapper or
- * exception_ptr, and user wants to handle std::runtime_error. This can be done
- * either by rehtrowing or with dynamic_cast.
- */
- BENCHMARK(exception_ptr_create_and_throw, iters) {
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ep = std::make_exception_ptr(e);
- try {
- std::rethrow_exception(ep);
- } catch (std::runtime_error&) {
- }
- }
- }
- BENCHMARK_RELATIVE(exception_wrapper_create_and_throw, iters) {
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ew = folly::make_exception_wrapper<std::runtime_error>(e);
- try {
- ew.throw_exception();
- } catch (std::runtime_error&) {
- }
- }
- }
- BENCHMARK_RELATIVE(exception_wrapper_create_and_cast, iters) {
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ew = folly::make_exception_wrapper<std::runtime_error>(e);
- bool b = ew.is_compatible_with<std::runtime_error>();
- folly::doNotOptimizeAway(b);
- }
- }
- BENCHMARK_DRAW_LINE();
- BENCHMARK(exception_ptr_create_and_throw_concurrent, iters) {
- std::atomic<bool> go(false);
- std::vector<std::thread> threads;
- BENCHMARK_SUSPEND {
- for (int t = 0; t < FLAGS_num_threads; ++t) {
- threads.emplace_back([&go, iters] {
- while (!go) {
- }
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ep = std::make_exception_ptr(e);
- try {
- std::rethrow_exception(ep);
- } catch (std::runtime_error&) {
- }
- }
- });
- }
- }
- go.store(true);
- for (auto& t : threads) {
- t.join();
- }
- }
- BENCHMARK_RELATIVE(exception_wrapper_create_and_throw_concurrent, iters) {
- std::atomic<bool> go(false);
- std::vector<std::thread> threads;
- BENCHMARK_SUSPEND {
- for (int t = 0; t < FLAGS_num_threads; ++t) {
- threads.emplace_back([&go, iters] {
- while (!go) {
- }
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ew = folly::make_exception_wrapper<std::runtime_error>(e);
- try {
- ew.throw_exception();
- } catch (std::runtime_error&) {
- }
- }
- });
- }
- }
- go.store(true);
- for (auto& t : threads) {
- t.join();
- }
- }
- BENCHMARK_RELATIVE(exception_wrapper_create_and_cast_concurrent, iters) {
- std::atomic<bool> go(false);
- std::vector<std::thread> threads;
- BENCHMARK_SUSPEND {
- for (int t = 0; t < FLAGS_num_threads; ++t) {
- threads.emplace_back([&go, iters] {
- while (!go) {
- }
- std::runtime_error e("payload");
- for (size_t i = 0; i < iters; ++i) {
- auto ew = folly::make_exception_wrapper<std::runtime_error>(e);
- bool b = ew.is_compatible_with<std::runtime_error>();
- folly::doNotOptimizeAway(b);
- }
- });
- }
- }
- go.store(true);
- for (auto& t : threads) {
- t.join();
- }
- }
- int main(int argc, char* argv[]) {
- gflags::ParseCommandLineFlags(&argc, &argv, true);
- folly::runBenchmarks();
- return 0;
- }
- /*
- _bin/folly/test/exception_wrapper_benchmark --bm_min_iters=100000
- ============================================================================
- folly/test/ExceptionWrapperBenchmark.cpp relative time/iter iters/s
- ============================================================================
- exception_ptr_create_and_test 2.03us 492.88K
- exception_wrapper_create_and_test 2542.59% 79.80ns 12.53M
- ----------------------------------------------------------------------------
- exception_ptr_create_and_test_concurrent 162.39us 6.16K
- exception_wrapper_create_and_test_concurrent 95847.91% 169.43ns 5.90M
- ----------------------------------------------------------------------------
- exception_ptr_create_and_throw 4.24us 236.06K
- exception_wrapper_create_and_throw 141.15% 3.00us 333.20K
- exception_wrapper_create_and_cast 5321.54% 79.61ns 12.56M
- ----------------------------------------------------------------------------
- exception_ptr_create_and_throw_concurrent 330.88us 3.02K
- exception_wrapper_create_and_throw_concurrent 143.66% 230.32us 4.34K
- exception_wrapper_create_and_cast_concurrent 194828.54% 169.83ns 5.89M
- ============================================================================
- */
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