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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.statistics;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterators;
import com.google.devtools.build.lib.profiler.ProfileInfo;
import com.google.devtools.build.lib.profiler.ProfileInfo.AggregateAttr;
import com.google.devtools.build.lib.profiler.ProfileInfo.Task;
import com.google.devtools.build.lib.profiler.ProfilePhase;
import com.google.devtools.build.lib.profiler.ProfilerTask;
import java.util.EnumMap;
import java.util.Iterator;
import java.util.List;
/**
* Extracts and keeps statistics for one {@link ProfilePhase} for formatting to various outputs.
*/
public final class PhaseStatistics implements Iterable<ProfilerTask> {
private final ProfilePhase phase;
private final long phaseDurationNanos;
private final long totalDurationNanos;
private final EnumMap<ProfilerTask, AggregateAttr> aggregateTaskStatistics;
private final PhaseVfsStatistics vfsStatistics;
private final boolean wasExecuted;
public PhaseStatistics(ProfilePhase phase, ProfileInfo info, String workSpaceName) {
this.phase = phase;
this.aggregateTaskStatistics = new EnumMap<>(ProfilerTask.class);
Task phaseTask = info.getPhaseTask(phase);
vfsStatistics = new PhaseVfsStatistics(workSpaceName, phase, info);
if (phaseTask == null) {
wasExecuted = false;
totalDurationNanos = 0;
phaseDurationNanos = 0;
} else {
wasExecuted = true;
phaseDurationNanos = info.getPhaseDuration(phaseTask);
List<Task> taskList = info.getTasksForPhase(phaseTask);
long duration = phaseDurationNanos;
for (Task task : taskList) {
// Tasks on the phaseTask thread already accounted for in the phaseDuration.
if (task.threadId != phaseTask.threadId) {
duration += task.duration;
}
}
totalDurationNanos = duration;
for (ProfilerTask type : ProfilerTask.values()) {
aggregateTaskStatistics.put(type, info.getStatsForType(type, taskList));
}
}
}
public ProfilePhase getProfilePhase() {
return phase;
}
public PhaseVfsStatistics getVfsStatistics() {
return vfsStatistics;
}
/**
* @return true if no {@link ProfilerTask}s have been executed in this phase, false otherwise
*/
public boolean isEmpty() {
return aggregateTaskStatistics.isEmpty();
}
/**
* @return true if the phase was not executed at all, false otherwise
*/
public boolean wasExecuted() {
return wasExecuted;
}
public long getPhaseDurationNanos() {
return phaseDurationNanos;
}
public long getTotalDurationNanos() {
return totalDurationNanos;
}
/**
* @return true if a task of the given {@link ProfilerTask} type was executed in this phase
*/
public boolean wasExecuted(ProfilerTask taskType) {
return aggregateTaskStatistics.get(taskType).count != 0;
}
/**
* @return the sum of all task durations of the given type
*/
public long getTotalDurationNanos(ProfilerTask taskType) {
return aggregateTaskStatistics.get(taskType).totalTime;
}
/**
* @return the average duration of all {@link ProfilerTask}
*/
public double getMeanDuration(ProfilerTask taskType) {
if (wasExecuted(taskType)) {
AggregateAttr stats = aggregateTaskStatistics.get(taskType);
return (double) stats.totalTime / stats.count;
}
return 0;
}
/**
* @return the duration of all {@link ProfilerTask} executed in the phase relative to the total
* phase duration
*/
public double getTotalRelativeDuration(ProfilerTask taskType) {
if (wasExecuted(taskType)) {
return (double) aggregateTaskStatistics.get(taskType).totalTime / totalDurationNanos;
}
return 0;
}
/**
* @return how many tasks of the given type were executed in this phase
*/
public int getCount(ProfilerTask taskType) {
return aggregateTaskStatistics.get(taskType).count;
}
/**
* Iterator over all {@link ProfilerTask}s that were executed at least once and have a total
* duration greater than 0.
*/
@Override
public Iterator<ProfilerTask> iterator() {
return Iterators.filter(
aggregateTaskStatistics.keySet().iterator(),
new Predicate<ProfilerTask>() {
@Override
public boolean apply(ProfilerTask taskType) {
return getTotalDurationNanos(taskType) != 0 && getCount(taskType) != 0;
}
});
}
}
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