jdk8-mips64-public/hotspot: test/gc/7072527/TestFullGCCount.java@b67a3f81b630 (annotated)

test/gc/7072527/TestFullGCCount.java@b67a3f81b630 (annotated)

test/gc/7072527/TestFullGCCount.java

Fri, 27 Jun 2014 11:07:23 +0100

author: coffeys
date: Fri, 27 Jun 2014 11:07:23 +0100
changeset 6899: b67a3f81b630
parent 5008: bfe3be9ebd6c
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Added tag jdk8u40-b00 for changeset 4828415ebbf1

 /*
  * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 /*
  * @test TestFullGCount.java
  * @bug 7072527
  * @summary CMS: JMM GC counters overcount in some cases
  * @run main/othervm -XX:+PrintGC TestFullGCCount
  */
 import java.util.*;
 import java.lang.management.*;
 /*
  * Originally for a specific failure in CMS, this test now monitors all
  * collectors for double-counting of collections.
  */
 public class TestFullGCCount {
     static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
     public static void main(String[] args) {
         int iterations = 20;
         boolean failed = false;
         String errorMessage = "";
         HashMap<String, List> counts = new HashMap<String, List>();
         // Prime the collection of count lists for all collectors.
         for (int i = 0; i < collectors.size(); i++) {
             GarbageCollectorMXBean collector = collectors.get(i);
             counts.put(collector.getName(), new ArrayList<Long>(iterations));
         }
         // Perform some gc, record collector counts.
         for (int i = 0; i < iterations; i++) {
             System.gc();
             addCollectionCount(counts, i);
         }
         // Check the increments:
         //   Old gen collectors should increase by one,
         //   New collectors may or may not increase.
         //   Any increase >=2 is unexpected.
         for (String collector : counts.keySet()) {
             System.out.println("Checking: " + collector);
             for (int i = 0; i < iterations - 1; i++) {
                 List<Long> theseCounts = counts.get(collector);
                 long a = theseCounts.get(i);
                 long b = theseCounts.get(i + 1);
                 if (b - a >= 2) {
                     failed = true;
                     errorMessage += "Collector '" + collector + "' has increment " + (b - a) +
                                     " at iteration " + i + "\n";
                 }
             }
         }
         if (failed) {
             System.err.println(errorMessage);
             throw new RuntimeException("FAILED: System.gc collections miscounted.");
         }
         System.out.println("Passed.");
     }
     private static void addCollectionCount(HashMap<String, List> counts, int iteration) {
         for (int i = 0; i < collectors.size(); i++) {
             GarbageCollectorMXBean collector = collectors.get(i);
             List thisList = counts.get(collector.getName());
             thisList.add(collector.getCollectionCount());
         }
     }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

test/gc/7072527/TestFullGCCount.java@b67a3f81b630 (annotated)

test/gc/7072527/TestFullGCCount.java