jdk8-mips64-public/hotspot: test/gc/7072527/TestFullGCCount.java@aed8bf036ce2

     1 /*

     2  * Copyright (c) 2011, 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:+UseConcMarkSweepGC TestFullGCCount

    29  *

    30  */

    31 import java.util.*;

    32 import java.lang.management.*;

    34 public class TestFullGCCount {

    36     public String collectorName = "ConcurrentMarkSweep";

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

    40         TestFullGCCount t = null;

    41         if (args.length==2) {

    42             t = new TestFullGCCount(args[0], args[1]);

    43         } else {

    44             t = new TestFullGCCount();

    45         }

    46         System.out.println("Monitoring collector: " + t.collectorName);

    47         t.run();

    48     }

    50     public TestFullGCCount(String pool, String collector) {

    51         collectorName = collector;

    52     }

    54     public TestFullGCCount() {

    55     }

    57     public void run() {

    58         int count = 0;

    59         int iterations = 20;

    60         long counts[] = new long[iterations];

    61         boolean diffAlways2 = true; // assume we will fail

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

    64             System.gc();

    65             counts[i] = getCollectionCount();

    66             if (i>0) {

    67                 if (counts[i] - counts[i-1] != 2) {

    68                     diffAlways2 = false;

    69                 }

    70             }

    71         }

    72         if (diffAlways2) {

    73             throw new RuntimeException("FAILED: System.gc must be incrementing count twice.");

    74         }

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

    76     }

    78     private long getCollectionCount() {

    79         long count = 0;

    80         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();

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

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

    83             GarbageCollectorMXBean collector = collectors.get(i);

    84             String name = collector.getName();

    85             if (name.contains(collectorName)) {

    86                 System.out.println(name + ": collection count = "

    87                                    + collector.getCollectionCount());

    88                 count = collector.getCollectionCount();

    89             }

    90         }

    91         return count;

    92     }

    94 }

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