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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include <benchmark/benchmark.h>
#include "mongo/bson/inline_decls.h"
#include "mongo/util/future.h"
namespace mongo {
NOINLINE_DECL int makeReadyInt() {
benchmark::ClobberMemory();
return 1;
}
void BM_plainIntReady(benchmark::State& state) {
for (auto _ : state) {
benchmark::DoNotOptimize(makeReadyInt() + 1);
}
}
NOINLINE_DECL Future<int> makeReadyFut() {
benchmark::ClobberMemory();
return Future<int>::makeReady(1);
}
void BM_futureIntReady(benchmark::State& state) {
for (auto _ : state) {
benchmark::DoNotOptimize(makeReadyFut().get() + 1);
}
}
void BM_futureIntReadyThen(benchmark::State& state) {
for (auto _ : state) {
benchmark::DoNotOptimize(makeReadyFut().then([](int i) { return i + 1; }).get());
}
}
NOINLINE_DECL Future<int> makeReadyFutWithPromise() {
benchmark::ClobberMemory();
auto pf = makePromiseFuture<int>();
pf.promise.emplaceValue(1);
return std::move(pf.future);
}
void BM_futureIntReadyWithPromise(benchmark::State& state) {
for (auto _ : state) {
benchmark::DoNotOptimize(makeReadyFutWithPromise().get() + 1);
}
}
void BM_futureIntReadyWithPromiseThen(benchmark::State& state) {
for (auto _ : state) {
int i = makeReadyFutWithPromise().then([](int i) { return i + 1; }).get();
benchmark::DoNotOptimize(i);
}
}
void BM_futureIntDeferredThen(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf = makePromiseFuture<int>();
auto fut = std::move(pf.future).then([](int i) { return i + 1; });
pf.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
void BM_futureIntDeferredThenImmediate(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf = makePromiseFuture<int>();
auto fut = std::move(pf.future).then([](int i) { return Future<int>::makeReady(i + 1); });
pf.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
void BM_futureIntDeferredThenReady(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf = makePromiseFuture<int>();
auto fut = std::move(pf.future).then([](int i) { return makeReadyFutWithPromise(); });
pf.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
void BM_futureIntDoubleDeferredThen(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf1 = makePromiseFuture<int>();
auto pf2 = makePromiseFuture<int>();
auto fut = std::move(pf1.future).then([&](int i) { return std::move(pf2.future); });
pf1.promise.emplaceValue(1);
pf2.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
void BM_futureInt3xDeferredThenNested(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf1 = makePromiseFuture<int>();
auto pf2 = makePromiseFuture<int>();
auto pf3 = makePromiseFuture<int>();
auto fut = std::move(pf1.future).then([&](int i) {
return std::move(pf2.future).then([&](int) { return std::move(pf3.future); });
});
pf1.promise.emplaceValue(1);
pf2.promise.emplaceValue(1);
pf3.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
void BM_futureInt3xDeferredThenChained(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf1 = makePromiseFuture<int>();
auto pf2 = makePromiseFuture<int>();
auto pf3 = makePromiseFuture<int>();
auto fut = std::move(pf1.future)
.then([&](int i) { return std::move(pf2.future); })
.then([&](int i) { return std::move(pf3.future); });
pf1.promise.emplaceValue(1);
pf2.promise.emplaceValue(1);
pf3.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
void BM_futureInt4xDeferredThenNested(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf1 = makePromiseFuture<int>();
auto pf2 = makePromiseFuture<int>();
auto pf3 = makePromiseFuture<int>();
auto pf4 = makePromiseFuture<int>();
auto fut = std::move(pf1.future).then([&](int i) {
return std::move(pf2.future).then([&](int) {
return std::move(pf3.future).then([&](int) { return std::move(pf4.future); });
});
});
pf1.promise.emplaceValue(1);
pf2.promise.emplaceValue(1);
pf3.promise.emplaceValue(1);
pf4.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
void BM_futureInt4xDeferredThenChained(benchmark::State& state) {
for (auto _ : state) {
benchmark::ClobberMemory();
auto pf1 = makePromiseFuture<int>();
auto pf2 = makePromiseFuture<int>();
auto pf3 = makePromiseFuture<int>();
auto pf4 = makePromiseFuture<int>();
auto fut = std::move(pf1.future) //
.then([&](int i) { return std::move(pf2.future); })
.then([&](int i) { return std::move(pf3.future); })
.then([&](int i) { return std::move(pf4.future); });
pf1.promise.emplaceValue(1);
pf2.promise.emplaceValue(1);
pf3.promise.emplaceValue(1);
pf4.promise.emplaceValue(1);
benchmark::DoNotOptimize(std::move(fut).get());
}
}
BENCHMARK(BM_plainIntReady);
BENCHMARK(BM_futureIntReady);
BENCHMARK(BM_futureIntReadyThen);
BENCHMARK(BM_futureIntReadyWithPromise);
BENCHMARK(BM_futureIntReadyWithPromiseThen);
BENCHMARK(BM_futureIntDeferredThen);
BENCHMARK(BM_futureIntDeferredThenImmediate);
BENCHMARK(BM_futureIntDeferredThenReady);
BENCHMARK(BM_futureIntDoubleDeferredThen);
BENCHMARK(BM_futureInt3xDeferredThenNested);
BENCHMARK(BM_futureInt3xDeferredThenChained);
BENCHMARK(BM_futureInt4xDeferredThenNested);
BENCHMARK(BM_futureInt4xDeferredThenChained);
} // namespace mongo
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