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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 {
+
+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::Task task) {
+ executor()->schedule(std::move(task));
+ }
+
+ stdx::mutex mu; // NOLINT
+ int nThreads = 0;
+ ServiceContext* sc;
+};
+
+/** 2x to benchmark the case of more threads than cores for curiosity's sake. */
+auto maxThreads = 2 * ProcessInfo::getNumCores();
+
+BENCHMARK_DEFINE_F(ServiceExecutorSynchronousBm, ScheduleTask)(benchmark::State& state) {
+ for (auto _ : state)
+ runOnExec([](Status) {});
+}
+BENCHMARK_REGISTER_F(ServiceExecutorSynchronousBm, ScheduleTask)->ThreadRange(1, maxThreads);
+
+/** A simplified ChainedSchedule with only one task. */
+BENCHMARK_DEFINE_F(ServiceExecutorSynchronousBm, ScheduleAndWait)(benchmark::State& state) {
+ for (auto _ : state) {
+ Notification done;
+ runOnExec([&](Status) { done.set(); });
+ done.get();
+ }
+}
+BENCHMARK_REGISTER_F(ServiceExecutorSynchronousBm, ScheduleAndWait)->ThreadRange(1, maxThreads);
+
+BENCHMARK_DEFINE_F(ServiceExecutorSynchronousBm, ChainedSchedule)(benchmark::State& state) {
+ int chainDepth = state.range(0);
+ Notification* donePtr = nullptr;
+ std::function<void(Status)> chainedTask = [&](Status) { donePtr->set(); };
+ for (int step = 0; step != chainDepth; ++step)
+ chainedTask = [this, chainedTask](Status) { runOnExec(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();
+ unittest::Barrier startingLine(2);
+ Notification done;
+ donePtr = &done;
+ runOnExec([&](Status) {
+ startingLine.countDownAndWait();
+ runOnExec(chainedTask);
+ });
+ state.ResumeTiming();
+ startingLine.countDownAndWait();
+ done.get();
+ }
+}
+BENCHMARK_REGISTER_F(ServiceExecutorSynchronousBm, ChainedSchedule)
+ ->Range(1, 2 << 10)
+ ->ThreadRange(1, maxThreads);
+
+} // namespace
+} // namespace mongo::transport