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/**
* Copyright (C) 2022-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 <benchmark/benchmark.h>
#include "mongo/db/concurrency/locker_noop_client_observer.h"
#include "mongo/logv2/log.h"
#include "mongo/transport/service_executor_synchronous.h"
#include "mongo/unittest/barrier.h"
#include "mongo/util/processinfo.h"
#include "mongo/util/scopeguard.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT mongo::logv2::LogComponent::kTest
namespace mongo::transport {
namespace {
/**
* ASAN can't handle the # of threads the benchmark creates (SERVER-73168).
* With sanitizers, run this in a diminished "correctness check" mode.
*/
#if __has_feature(address_sanitizer) || __has_feature(thread_sanitizer)
const auto kMaxThreads = 1;
const auto kMaxChainSize = 1;
#else
/** 2x to benchmark the case of more threads than cores for curiosity's sake. */
const auto kMaxThreads = 2 * ProcessInfo::getNumCores();
const auto kMaxChainSize = 64;
#endif
struct Notification {
void set() {
stdx::unique_lock lk{mu};
notified = true;
cv.notify_all();
}
void get() {
stdx::unique_lock lk{mu};
cv.wait(lk, [&] { return notified; });
}
stdx::mutex mu; // NOLINT
stdx::condition_variable cv;
bool notified = false;
};
class ServiceExecutorSynchronousBm : public benchmark::Fixture {
public:
void firstSetup() {
auto usc = ServiceContext::make();
sc = usc.get();
usc->registerClientObserver(std::make_unique<LockerNoopClientObserver>());
setGlobalServiceContext(std::move(usc));
(void)executor()->start();
}
ServiceExecutorSynchronous* executor() {
return ServiceExecutorSynchronous::get(sc);
}
void lastTearDown() {
(void)executor()->shutdown(Hours{1});
setGlobalServiceContext({});
}
void SetUp(benchmark::State& state) override {
stdx::lock_guard lk{mu};
if (nThreads++)
return;
firstSetup();
}
void TearDown(benchmark::State& state) override {
stdx::lock_guard lk{mu};
if (--nThreads)
return;
lastTearDown();
}
void runOnExec(ServiceExecutor::TaskRunner* taskRunner, ServiceExecutor::Task task) {
taskRunner->schedule(std::move(task));
}
stdx::mutex mu; // NOLINT
int nThreads = 0;
ServiceContext* sc;
};
BENCHMARK_DEFINE_F(ServiceExecutorSynchronousBm, ScheduleTask)(benchmark::State& state) {
for (auto _ : state) {
auto runner = executor()->makeTaskRunner();
runOnExec(&*runner, [](Status) {});
}
}
BENCHMARK_REGISTER_F(ServiceExecutorSynchronousBm, ScheduleTask)->ThreadRange(1, kMaxThreads);
/** A simplified ChainedSchedule with only one task. */
BENCHMARK_DEFINE_F(ServiceExecutorSynchronousBm, ScheduleAndWait)(benchmark::State& state) {
for (auto _ : state) {
auto runner = executor()->makeTaskRunner();
Notification done;
runOnExec(&*runner, [&](Status) { done.set(); });
done.get();
}
}
BENCHMARK_REGISTER_F(ServiceExecutorSynchronousBm, ScheduleAndWait)->ThreadRange(1, kMaxThreads);
BENCHMARK_DEFINE_F(ServiceExecutorSynchronousBm, ChainedSchedule)(benchmark::State& state) {
int chainDepth = state.range(0);
struct LoopState {
std::shared_ptr<ServiceExecutor::TaskRunner> runner;
Notification done;
unittest::Barrier startingLine{2};
};
LoopState* loopStatePtr = nullptr;
std::function<void(Status)> chainedTask = [&](Status) {
loopStatePtr->done.set();
};
for (int step = 0; step != chainDepth; ++step)
chainedTask = [this, chainedTask, &loopStatePtr](Status) {
runOnExec(&*loopStatePtr->runner, chainedTask);
};
// The first scheduled task starts the worker thread. This test is
// specifically measuring the per-task schedule and run overhead. So startup
// costs are moved outside the loop. But it's tricky because that started
// thread will die if its task returns without scheduling a successor task.
// So we start the worker thread with a task that will pause until the
// benchmark loop resumes it.
for (auto _ : state) {
state.PauseTiming();
LoopState loopState{
executor()->makeTaskRunner(),
{},
};
loopStatePtr = &loopState;
runOnExec(&*loopStatePtr->runner, [&](Status s) {
loopState.startingLine.countDownAndWait();
runOnExec(&*loopStatePtr->runner, chainedTask);
});
state.ResumeTiming();
loopState.startingLine.countDownAndWait();
loopState.done.get();
}
}
BENCHMARK_REGISTER_F(ServiceExecutorSynchronousBm, ChainedSchedule)
->Range(1, kMaxChainSize)
->ThreadRange(1, kMaxThreads);
} // namespace
} // namespace mongo::transport
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