jdk8-mips64-public/hotspot: test/gc/7072527/TestFullGCCount.java@a51071796915

8068013: [TESTBUG] Aix support in hotspot jtreg tests
Reviewed-by: ctornqvi, fzhinkin, farvidsson

     1 /*

     2  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    24 /*

    25  * @test TestFullGCount.java

    26  * @bug 7072527

    27  * @summary CMS: JMM GC counters overcount in some cases

    28  * @run main/othervm -XX:+PrintGC TestFullGCCount

    29  */

    30 import java.util.*;

    31 import java.lang.management.*;

    33 /*

    34  * Originally for a specific failure in CMS, this test now monitors all

    35  * collectors for double-counting of collections.

    36  */

    37 public class TestFullGCCount {

    39     static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();

    41     public static void main(String[] args) {

    42         int iterations = 20;

    43         boolean failed = false;

    44         String errorMessage = "";

    45         HashMap<String, List> counts = new HashMap<String, List>();

    47         // Prime the collection of count lists for all collectors.

    48         for (int i = 0; i < collectors.size(); i++) {

    49             GarbageCollectorMXBean collector = collectors.get(i);

    50             counts.put(collector.getName(), new ArrayList<Long>(iterations));

    51         }

    53         // Perform some gc, record collector counts.

    54         for (int i = 0; i < iterations; i++) {

    55             System.gc();

    56             addCollectionCount(counts, i);

    57         }

    59         // Check the increments:

    60         //   Old gen collectors should increase by one,

    61         //   New collectors may or may not increase.

    62         //   Any increase >=2 is unexpected.

    63         for (String collector : counts.keySet()) {

    64             System.out.println("Checking: " + collector);

    66             for (int i = 0; i < iterations - 1; i++) {

    67                 List<Long> theseCounts = counts.get(collector);

    68                 long a = theseCounts.get(i);

    69                 long b = theseCounts.get(i + 1);

    70                 if (b - a >= 2) {

    71                     failed = true;

    72                     errorMessage += "Collector '" + collector + "' has increment " + (b - a) +

    73                                     " at iteration " + i + "\n";

    74                 }

    75             }

    76         }

    77         if (failed) {

    78             System.err.println(errorMessage);

    79             throw new RuntimeException("FAILED: System.gc collections miscounted.");

    80         }

    81         System.out.println("Passed.");

    82     }

    84     private static void addCollectionCount(HashMap<String, List> counts, int iteration) {

    85         for (int i = 0; i < collectors.size(); i++) {

    86             GarbageCollectorMXBean collector = collectors.get(i);

    87             List thisList = counts.get(collector.getName());

    88             thisList.add(collector.getCollectionCount());

    89         }

    90     }

    91 }

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