109 lines
3.7 KiB
Java
109 lines
3.7 KiB
Java
/*
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* Copyright (c) 2014, 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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/*
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* @test TestG1ConcurrentGCHeapDump
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* @bug 8038925
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* @summary Checks that a heap dump can be made with G1 when no fullgc
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* has been made
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* @run main/othervm -Xms512m -Xmx1024m -XX:+ExplicitGCInvokesConcurrent TestG1ConcurrentGCHeapDump
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*/
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import java.util.List;
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import java.util.ArrayList;
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import java.util.LinkedList;
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import javax.management.MBeanServer;
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import java.lang.management.ManagementFactory;
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import java.lang.management.GarbageCollectorMXBean;
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import sun.management.ManagementFactoryHelper;
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import com.sun.management.HotSpotDiagnosticMXBean;
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import com.sun.management.VMOption;
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import java.io.IOException;
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import java.io.File;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.Files;
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public class TestG1ConcurrentGCHeapDump {
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private static final String HOTSPOT_BEAN_NAME =
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"com.sun.management:type=HotSpotDiagnostic";
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private static final String G1_OLD_BEAN_NAME =
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"java.lang:type=GarbageCollector,name=G1 Old Generation";
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private static MBeanServer server = ManagementFactory.getPlatformMBeanServer();
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private static void dumpHeap() throws IOException {
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HotSpotDiagnosticMXBean hotspot_bean =
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ManagementFactory.newPlatformMXBeanProxy(server,
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HOTSPOT_BEAN_NAME, HotSpotDiagnosticMXBean.class);
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Path dir = Files.createTempDirectory("JDK-8038925_");
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String file = dir + File.separator + "heapdump";
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hotspot_bean.dumpHeap(file, false);
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Files.delete(Paths.get(file));
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Files.delete(dir);
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}
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private static void verifyNoFullGC() throws IOException {
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GarbageCollectorMXBean g1_old_bean =
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ManagementFactory.newPlatformMXBeanProxy(server,
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G1_OLD_BEAN_NAME, GarbageCollectorMXBean.class);
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if (g1_old_bean.getCollectionCount() != 0) {
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throw new RuntimeException("A full GC has occured, this test will not work.");
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}
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}
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public static void main(String[] args) throws IOException {
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HotSpotDiagnosticMXBean diagnostic = ManagementFactoryHelper.getDiagnosticMXBean();
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VMOption option = diagnostic.getVMOption("UseG1GC");
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if (option.getValue().equals("false")) {
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System.out.println("Skipping this test. It is only a G1 test.");
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return;
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}
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// Create some dead objects
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ArrayList<List<Integer>> arraylist = new ArrayList<List<Integer>>();
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for (int i = 0; i < 2; i++) {
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for (int j = 0; j < 100; j++) {
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LinkedList<Integer> li = new LinkedList<Integer>();
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arraylist.add(li);
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for (int k = 0; k < 10000; k++) {
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li.add(k);
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}
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}
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arraylist = new ArrayList<List<Integer>>();
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System.gc();
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}
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// Try to dump heap
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dumpHeap();
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// Make sure no full GC has happened, since test won't work if that is the case
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verifyNoFullGC();
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}
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}
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