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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.
package com.google.devtools.build.lib.profiler;
import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import com.google.devtools.build.lib.clock.BlazeClock;
import com.google.devtools.build.lib.profiler.Profiler.ProfiledTaskKinds;
import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
/**
* Microbenchmarks for the overhead of {@link AutoProfiler} over using {@link Profiler} manually.
*/
public class AutoProfilerBenchmark {
private final ProfilerTask profilerTaskType = ProfilerTask.INFO;
@BeforeExperiment
void startProfiler() throws Exception {
Profiler.instance().start(
ProfiledTaskKinds.ALL,
new InMemoryFileSystem().getPath("/out.dat").getOutputStream(),
Profiler.Format.BINARY_BAZEL_FORMAT,
"benchmark",
false,
BlazeClock.instance(),
BlazeClock.instance().nanoTime());
}
@BeforeExperiment
void stopProfiler() throws Exception {
Profiler.instance().stop();
}
@Benchmark
void profiledWithAutoProfiler(int reps) {
for (int i = 0; i < reps; i++) {
try (AutoProfiler p = AutoProfiler.profiled("profiling", profilerTaskType)) {}
}
}
@Benchmark
void profiledManually(int reps) {
for (int i = 0; i < reps; i++) {
long startTime = Profiler.nanoTimeMaybe();
Profiler.instance().logSimpleTask(startTime, profilerTaskType, "description");
}
}
}
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