| // 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 Object obj = new Object(); |
| private final ProfilerTask profilerTaskType = ProfilerTask.TEST; |
| |
| @BeforeExperiment |
| void startProfiler() throws Exception { |
| Profiler.instance().start(ProfiledTaskKinds.ALL, |
| new InMemoryFileSystem().getPath("/out.dat").getOutputStream(), "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(obj, profilerTaskType)) { |
| } |
| } |
| } |
| |
| @Benchmark |
| void profiledManually(int reps) { |
| for (int i = 0; i < reps; i++) { |
| long startTime = Profiler.nanoTimeMaybe(); |
| Profiler.instance().logSimpleTask(startTime, profilerTaskType, obj); |
| } |
| } |
| } |