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// Copyright 2014 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.runtime;
import com.google.common.base.Joiner;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import com.google.devtools.build.lib.buildtool.buildevent.BuildCompleteEvent;
import com.google.devtools.build.lib.buildtool.buildevent.ExecutionStartingEvent;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.Reporter;
import com.google.devtools.build.lib.profiler.Profiler;
import com.google.devtools.build.lib.profiler.ProfilerTask;
import com.google.devtools.build.lib.util.BlazeClock;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
/**
* Blaze module for the build summary message that reports various stats to the user.
*/
public class BuildSummaryStatsModule extends BlazeModule {
private static final Logger LOG = Logger.getLogger(BuildSummaryStatsModule.class.getName());
private SimpleCriticalPathComputer criticalPathComputer;
private EventBus eventBus;
private Reporter reporter;
@Override
public void beforeCommand(Command command, CommandEnvironment env) {
this.reporter = env.getReporter();
this.eventBus = env.getEventBus();
eventBus.register(this);
}
@Subscribe
public void executionPhaseStarting(ExecutionStartingEvent event) {
criticalPathComputer = new SimpleCriticalPathComputer(BlazeClock.instance());
eventBus.register(criticalPathComputer);
}
@Subscribe
public void buildComplete(BuildCompleteEvent event) {
try {
// We might want to make this conditional on a flag; it can sometimes be a bit of a nuisance.
List<String> items = new ArrayList<>();
items.add(String.format("Elapsed time: %.3fs", event.getResult().getElapsedSeconds()));
if (criticalPathComputer != null) {
Profiler.instance().startTask(ProfilerTask.CRITICAL_PATH, "Critical path");
AggregatedCriticalPath<SimpleCriticalPathComponent> criticalPath =
criticalPathComputer.aggregate();
items.add(criticalPath.toStringSummary());
LOG.info(criticalPath.toString());
LOG.info("Slowest actions:\n " + Joiner.on("\n ")
.join(criticalPathComputer.getSlowestComponents()));
// We reverse the critical path because the profiler expect events ordered by the time
// when the actions were executed while critical path computation is stored in the reverse
// way.
for (SimpleCriticalPathComponent stat : criticalPath.components().reverse()) {
Profiler.instance().logSimpleTaskDuration(
TimeUnit.MILLISECONDS.toNanos(stat.getStartWallTimeMillis(BlazeClock.instance())),
stat.getElapsedTimeNanos(),
ProfilerTask.CRITICAL_PATH_COMPONENT, stat.getAction());
}
Profiler.instance().completeTask(ProfilerTask.CRITICAL_PATH);
}
reporter.handle(Event.info(Joiner.on(", ").join(items)));
} finally {
criticalPathComputer = null;
}
}
}
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