70 lines
2.7 KiB
Java
70 lines
2.7 KiB
Java
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/*
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* Copyright (c) 2013, 2018, 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 vm.share.gc;
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import java.lang.management.ManagementFactory;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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import nsk.share.TestFailure;
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import nsk.share.test.ExecutionController;
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public class TriggerUnloadingByFillingHeap implements TriggerUnloadingHelper {
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public void triggerUnloading(ExecutionController stresser) {
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List<String> jvmArgs = ManagementFactory.getRuntimeMXBean().getInputArguments();
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if (jvmArgs.contains("-XX:+ExplicitGCInvokesConcurrent")) {
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throw new TestFailure("Test bug! Found -XX:+ExplicitGCInvokesConcurrent in jvm args. TriggerUnloadingByFillingHeap.triggerUnloading will not work!.");
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}
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System.out.println("collections invoked: " + provokeGC(stresser));
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System.out.println("collections invoked: " + provokeGC(stresser));
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System.out.println("collections invoked: " + provokeGC(stresser));
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}
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private static long getGCCounter() {
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return ManagementFactory.getGarbageCollectorMXBeans().get(1).getCollectionCount();
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}
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private static Random random = new Random();
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public static byte[] garbage; //make it reference public to avoid compiler optimizations
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private static long provokeGC(ExecutionController stresser) {
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long initCounter = getGCCounter();
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ArrayList<byte[]> list = new ArrayList<byte[]>();
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while (getGCCounter() == initCounter && stresser.continueExecution()) {
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list.add(new byte[1024]);
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garbage = new byte[1024];
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if (random.nextInt(10) % 10 < 3 && !list.isEmpty()) {
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list.remove(0);
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}
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System.gc();
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}
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return getGCCounter() - initCounter;
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}
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}
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