+/*
+ * Copyright 2015 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/Benchmark.h>
+#include <folly/io/async/EventBase.h>
+
+#include <gflags/gflags.h>
+
+using namespace folly;
+
+class CountedLoopCallback : public EventBase::LoopCallback {
+ public:
+ CountedLoopCallback(EventBase* eventBase, unsigned int count)
+ : eventBase_(eventBase)
+ , count_(count) {}
+
+ virtual void runLoopCallback() noexcept {
+ --count_;
+ if (count_ > 0) {
+ eventBase_->runInLoop(this);
+ }
+ }
+
+ private:
+ EventBase* eventBase_;
+ unsigned int count_;
+};
+
+BENCHMARK(timeMeasurementsOn, n) {
+ EventBase eventBase;
+
+ while (n--) {
+ CountedLoopCallback c(&eventBase, 10);
+ eventBase.runInLoop(&c);
+ eventBase.loop();
+ }
+}
+
+BENCHMARK_RELATIVE(timeMeasurementsOff, n) {
+ EventBase eventBase(/* enableTimeMeasurement */ false);
+
+ while (n--) {
+ CountedLoopCallback c(&eventBase, 10);
+ eventBase.runInLoop(&c);
+ eventBase.loop();
+ }
+}
+
+/**
+ * --bm_min_iters=1000000
+ *
+ * ============================================================================
+ * folly/io/async/test/EventBaseBenchmark.cpp relative time/iter iters/s
+ * ============================================================================
+ * timeMeasurementsOn 2.02us 494.57K
+ * timeMeasurementsOff 231.19% 874.58ns 1.14M
+ * ============================================================================
+ */
+
+int main(int argc, char** argv) {
+ gflags::ParseCommandLineFlags(&argc, &argv, true);
+ runBenchmarks();
+}