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// Copyright 2014 Google Inc. 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.Preconditions;
import com.google.common.collect.ImmutableMap;
import java.lang.management.GarbageCollectorMXBean;
import java.util.ArrayList;
import java.util.List;
/**
* Record GC stats for a build.
*/
public class GCStatsRecorder {
private final Iterable<GarbageCollectorMXBean> mxBeans;
private final ImmutableMap<String, GCStat> initialData;
public GCStatsRecorder(Iterable<GarbageCollectorMXBean> mxBeans) {
this.mxBeans = mxBeans;
ImmutableMap.Builder<String, GCStat> initialData = ImmutableMap.builder();
for (GarbageCollectorMXBean mxBean : mxBeans) {
String name = mxBean.getName();
initialData.put(name, new GCStat(name, mxBean.getCollectionCount(),
mxBean.getCollectionTime()));
}
this.initialData = initialData.build();
}
public Iterable<GCStat> getCurrentGcStats() {
List<GCStat> stats = new ArrayList<>();
for (GarbageCollectorMXBean mxBean : mxBeans) {
String name = mxBean.getName();
GCStat initStat = Preconditions.checkNotNull(initialData.get(name));
stats.add(new GCStat(name,
mxBean.getCollectionCount() - initStat.getNumCollections(),
mxBean.getCollectionTime() - initStat.getTotalTimeInMs()));
}
return stats;
}
/** Represents the garbage collections statistics for one collector (For example CMS). */
public static class GCStat {
private final String name;
private final long numCollections;
private final long totalTimeInMs;
public GCStat(String name, long numCollections, long totalTimeInMs) {
this.name = name;
this.numCollections = numCollections;
this.totalTimeInMs = totalTimeInMs;
}
/** Name of the Collector. For example CMS. */
public String getName() { return name; }
/** Number of invocations for a build. */
public long getNumCollections() { return numCollections; }
/**
* Total time spend in GC for the collector. Note that the time does need to be exclusive (aka a
* stop-the-world GC).
*/
public long getTotalTimeInMs() { return totalTimeInMs; }
@Override
public String toString() {
return "GC time for '" + name + "' collector: " + numCollections
+ " collections using " + totalTimeInMs + "ms";
}
}
}
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