Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: test/gc/7072527/TestFullGCCount.java
test/gc/7072527/TestFullGCCount.java
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| 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 */ | |
| 23 | |
| 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.*; | |
| 32 | |
| 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 { | |
| 38 | |
| 39 static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); | |
| 40 | |
| 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>(); | |
| 46 | |
| 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 } | |
| 52 | |
| 53 // Perform some gc, record collector counts. | |
| 54 for (int i = 0; i < iterations; i++) { | |
| 55 System.gc(); | |
| 56 addCollectionCount(counts, i); | |
| 57 } | |
| 58 | |
| 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); | |
| 65 | |
| 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 } | |
| 83 | |
| 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 } |
