82 lines
3.0 KiB
Java
82 lines
3.0 KiB
Java
/*
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* Copyright (c) 2023, 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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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.lib.Platform;
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import jdk.test.lib.process.ProcessTools;
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadInfo;
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import java.lang.management.ThreadMXBean;
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/*
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* @test
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* @bug 8318757
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* @summary Test concurrent monitor deflation by MonitorDeflationThread and thread dumping
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* @library /test/lib
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:GuaranteedAsyncDeflationInterval=2000 -XX:LockingMode=0 ConcurrentDeflation
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*/
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public class ConcurrentDeflation {
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public static final long TOTAL_RUN_TIME_NS = 10_000_000_000L;
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public static Object[] monitors = new Object[1000];
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public static int monitorCount;
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public static void main(String[] args) throws Exception {
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Thread threadDumper = new Thread(() -> dumpThreads());
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threadDumper.start();
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Thread monitorCreator = new Thread(() -> createMonitors());
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monitorCreator.start();
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threadDumper.join();
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monitorCreator.join();
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}
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static private void dumpThreads() {
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ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
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int dumpCount = 0;
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long startTime = System.nanoTime();
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while (System.nanoTime() - startTime < TOTAL_RUN_TIME_NS) {
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threadBean.dumpAllThreads(true, false);
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dumpCount++;
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try {
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Thread.sleep(10);
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} catch (InterruptedException e) {}
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}
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System.out.println("Dumped all thread info " + dumpCount + " times");
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}
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static private void createMonitors() {
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int index = 0;
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long startTime = System.nanoTime();
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while (System.nanoTime() - startTime < TOTAL_RUN_TIME_NS) {
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index = index++ % 1000;
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monitors[index] = new Object();
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synchronized (monitors[index]) {
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monitorCount++;
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}
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}
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System.out.println("Created " + monitorCount + " monitors");
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}
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}
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