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annotate test/serviceability/threads/TestFalseDeadLock.java @ 12250:9044964f9163

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8024669: Native OOME when allocating after changes to maximum heap supporting Coops sizing on sparcv9 Summary: After changes in 8010722 the ergonomics for calculating the size of the heap that supports zero based compressed oops changed. This lead to the VM actually using zero based compressed oops. Due to low default HeapBaseMinAddress, the OS mapping in the application image at the same address, and limitations of the malloc implementation on Solaris this resulted in very little C heap available for the VM. So the VM immediately gives a native OOME when the machine has lots of physical memory (>=32G). The solution is to increase the HeapBaseMinAddress so that the VM has enough C heap. Reviewed-by: kvn, brutisso
author tschatzl
date Wed, 18 Sep 2013 13:18:52 +0200
parents ef748153ee8f
children
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 import java.lang.management.ManagementFactory;
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25 import java.lang.management.ThreadMXBean;
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26 import java.util.Random;
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27
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28 /*
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29 * @test
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30 * @bug 8016304
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31 * @summary Make sure no deadlock is reported for this program which has no deadlocks.
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32 * @run main/othervm TestFalseDeadLock
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33 */
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34
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35 /*
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36 * This test will not provoke the bug every time it is run since the bug is intermittent.
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37 * The test has a fixed running time of 5 seconds.
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38 */
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39
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40 public class TestFalseDeadLock {
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41 private static ThreadMXBean bean;
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42 private static volatile boolean running = true;
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43 private static volatile boolean found = false;
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44
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45 public static void main(String[] args) throws Exception {
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46 bean = ManagementFactory.getThreadMXBean();
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47 Thread[] threads = new Thread[500];
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48 for (int i = 0; i < threads.length; i++) {
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49 Test t = new Test();
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50 threads[i] = new Thread(t);
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51 threads[i].start();
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52 }
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53 try {
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54 Thread.sleep(5000);
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55 } catch (InterruptedException ex) {
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56 }
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57 running = false;
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58 for (Thread t : threads) {
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59 t.join();
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60 }
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61 if (found) {
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62 throw new Exception("Deadlock reported, but there is no deadlock.");
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63 }
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64 }
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65
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66 public static class Test implements Runnable {
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67 public void run() {
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68 Random r = new Random();
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69 while (running) {
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70 try {
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71 synchronized (this) {
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72 wait(r.nextInt(1000) + 1);
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73 }
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74 } catch (InterruptedException ex) {
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75 }
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76 recurse(2000);
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77 }
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78 if (bean.findDeadlockedThreads() != null) {
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79 System.out.println("FOUND!");
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80 found = true;
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81 }
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82 }
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83
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84 private void recurse(int i) {
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85 if (!running) {
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86 // It is important for the test to call println here
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87 // since there are locks inside that path.
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88 System.out.println("Hullo");
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89 }
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90 else if (i > 0) {
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91 recurse(i - 1);
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92 }
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93 }
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94 }
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95 }