kevinw@3025: /*
kevinw@3025:  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
kevinw@3025:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
kevinw@3025:  *
kevinw@3025:  * This code is free software; you can redistribute it and/or modify it
kevinw@3025:  * under the terms of the GNU General Public License version 2 only, as
kevinw@3025:  * published by the Free Software Foundation.
kevinw@3025:  *
kevinw@3025:  * This code is distributed in the hope that it will be useful, but WITHOUT
kevinw@3025:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
kevinw@3025:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
kevinw@3025:  * version 2 for more details (a copy is included in the LICENSE file that
kevinw@3025:  * accompanied this code).
kevinw@3025:  *
kevinw@3025:  * You should have received a copy of the GNU General Public License version
kevinw@3025:  * 2 along with this work; if not, write to the Free Software Foundation,
kevinw@3025:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
kevinw@3025:  *
kevinw@3025:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
kevinw@3025:  * or visit www.oracle.com if you need additional information or have any
kevinw@3025:  * questions.
kevinw@3025:  */
kevinw@3025: 
kevinw@3025: /*
kevinw@3025:  * @test TestFullGCount.java
kevinw@3025:  * @bug 7072527
kevinw@3025:  * @summary CMS: JMM GC counters overcount in some cases
kevinw@3025:  * @run main/othervm -XX:+UseConcMarkSweepGC TestFullGCCount
kevinw@3025:  *
kevinw@3025:  */
kevinw@3025: import java.util.*;
kevinw@3025: import java.lang.management.*;
kevinw@3025: 
kevinw@3025: public class TestFullGCCount {
kevinw@3025: 
kevinw@3025:     public String collectorName = "ConcurrentMarkSweep";
kevinw@3025: 
kevinw@3025:     public static void main(String [] args) {
kevinw@3025: 
kevinw@3025:         TestFullGCCount t = null;
kevinw@3025:         if (args.length==2) {
kevinw@3025:             t = new TestFullGCCount(args[0], args[1]);
kevinw@3025:         } else {
kevinw@3025:             t = new TestFullGCCount();
kevinw@3025:         }
kevinw@3025:         System.out.println("Monitoring collector: " + t.collectorName);
kevinw@3025:         t.run();
kevinw@3025:     }
kevinw@3025: 
kevinw@3025:     public TestFullGCCount(String pool, String collector) {
kevinw@3025:         collectorName = collector;
kevinw@3025:     }
kevinw@3025: 
kevinw@3025:     public TestFullGCCount() {
kevinw@3025:     }
kevinw@3025: 
kevinw@3025:     public void run() {
kevinw@3025:         int count = 0;
kevinw@3025:         int iterations = 20;
kevinw@3025:         long counts[] = new long[iterations];
kevinw@3025:         boolean diffAlways2 = true; // assume we will fail
kevinw@3025: 
kevinw@3025:         for (int i=0; i<iterations; i++) {
kevinw@3025:             System.gc();
kevinw@3025:             counts[i] = getCollectionCount();
kevinw@3025:             if (i>0) {
kevinw@3025:                 if (counts[i] - counts[i-1] != 2) {
kevinw@3025:                     diffAlways2 = false;
kevinw@3025:                 }
kevinw@3025:             }
kevinw@3025:         }
kevinw@3025:         if (diffAlways2) {
kevinw@3025:             throw new RuntimeException("FAILED: System.gc must be incrementing count twice.");
kevinw@3025:         }
kevinw@3025:         System.out.println("Passed.");
kevinw@3025:     }
kevinw@3025: 
kevinw@3025:     private long getCollectionCount() {
kevinw@3025:         long count = 0;
kevinw@3025:         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
kevinw@3025:         List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
kevinw@3025:         for (int i=0; i<collectors.size(); i++) {
kevinw@3025:             GarbageCollectorMXBean collector = collectors.get(i);
kevinw@3025:             String name = collector.getName();
kevinw@3025:             if (name.contains(collectorName)) {
kevinw@3025:                 System.out.println(name + ": collection count = "
kevinw@3025:                                    + collector.getCollectionCount());
kevinw@3025:                 count = collector.getCollectionCount();
kevinw@3025:             }
kevinw@3025:         }
kevinw@3025:         return count;
kevinw@3025:     }
kevinw@3025: 
kevinw@3025: }
kevinw@3025: