f8b5f55021
Some of the jstat and jstack tests refactored to be run with the jtreg Reviewed-by: jbachorik
111 lines
4.1 KiB
Java
111 lines
4.1 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package utils;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryPoolMXBean;
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import java.lang.management.MemoryUsage;
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import java.util.ArrayList;
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import java.util.List;
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/**
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*
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* Utilities to provoke GC in various ways
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*/
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public class GcProvokerImpl implements GcProvoker {
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private static List<Object> eatenMetaspace;
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private static List<Object> eatenMemory;
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static List<Object> eatHeapMemory(float targetUsage) {
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long maxMemory = Runtime.getRuntime().maxMemory();
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// uses fixed small objects to avoid Humongous objects allocation in G1
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int memoryChunk = 2048;
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List<Object> list = new ArrayList<>();
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float used = 0;
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while (used < targetUsage * maxMemory) {
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try {
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list.add(new byte[memoryChunk]);
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used += memoryChunk;
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} catch (OutOfMemoryError e) {
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list = null;
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throw new RuntimeException("Unexpected OOME while eating " + targetUsage + " of heap memory.");
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}
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}
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return list;
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}
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@Override
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public void provokeGc() {
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for (int i = 0; i < 3; i++) {
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long edenSize = Pools.getEdenCommittedSize();
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long heapSize = Pools.getHeapCommittedSize();
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float targetPercent = ((float) edenSize) / (heapSize);
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if ((targetPercent <= 0) || (targetPercent > 1.0)) {
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throw new RuntimeException("Error in the percent calculation" + " (eden size: " + edenSize + ", heap size: " + heapSize + ", calculated eden percent: " + targetPercent + ")");
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}
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eatHeapMemory(targetPercent);
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eatHeapMemory(targetPercent);
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System.gc();
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}
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}
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@Override
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public void eatMetaspaceAndHeap(float targetMemoryUsagePercent) {
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eatenMemory = eatHeapMemory(targetMemoryUsagePercent);
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eatenMetaspace = eatMetaspace(targetMemoryUsagePercent);
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}
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private static List<Object> eatMetaspace(float targetUsage) {
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List<Object> list = new ArrayList<>();
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final String metaspacePoolName = "Metaspace";
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MemoryPoolMXBean metaspacePool = null;
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for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
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if (pool.getName().contains(metaspacePoolName)) {
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metaspacePool = pool;
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break;
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}
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}
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if (metaspacePool == null) {
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throw new RuntimeException("MXBean for Metaspace pool wasn't found");
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}
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float currentUsage;
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GeneratedClassProducer gp = new GeneratedClassProducer();
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do {
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try {
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list.add(gp.create(0));
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} catch (OutOfMemoryError oome) {
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list = null;
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throw new RuntimeException("Unexpected OOME while eating " + targetUsage + " of Metaspace.");
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}
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MemoryUsage memoryUsage = metaspacePool.getUsage();
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currentUsage = (((float) memoryUsage.getUsed()) / memoryUsage.getMax());
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} while (currentUsage < targetUsage);
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return list;
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}
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public GcProvokerImpl() {
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}
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}
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