| // 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.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"; |
| } |
| } |
| } |