Mercurial > jdk8-mips64-public > hotspot / annotate
test/gc/7072527/TestFullGCCount.java@8c95980d0b66 (annotated)
test/gc/7072527/TestFullGCCount.java
Sat, 07 Nov 2020 10:30:02 +0800
- author
- aoqi
- date
- Sat, 07 Nov 2020 10:30:02 +0800
- changeset 10026
- 8c95980d0b66
- parent 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | */ |
| aoqi@0 | 23 | |
| aoqi@0 | 24 | /* |
| aoqi@0 | 25 | * @test TestFullGCount.java |
| aoqi@0 | 26 | * @bug 7072527 |
| aoqi@0 | 27 | * @summary CMS: JMM GC counters overcount in some cases |
| aoqi@0 | 28 | * @run main/othervm -XX:+PrintGC TestFullGCCount |
| aoqi@0 | 29 | */ |
| aoqi@0 | 30 | import java.util.*; |
| aoqi@0 | 31 | import java.lang.management.*; |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | /* |
| aoqi@0 | 34 | * Originally for a specific failure in CMS, this test now monitors all |
| aoqi@0 | 35 | * collectors for double-counting of collections. |
| aoqi@0 | 36 | */ |
| aoqi@0 | 37 | public class TestFullGCCount { |
| aoqi@0 | 38 | |
| aoqi@0 | 39 | static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); |
| aoqi@0 | 40 | |
| aoqi@0 | 41 | public static void main(String[] args) { |
| aoqi@0 | 42 | int iterations = 20; |
| aoqi@0 | 43 | boolean failed = false; |
| aoqi@0 | 44 | String errorMessage = ""; |
| aoqi@0 | 45 | HashMap<String, List> counts = new HashMap<String, List>(); |
| aoqi@0 | 46 | |
| aoqi@0 | 47 | // Prime the collection of count lists for all collectors. |
| aoqi@0 | 48 | for (int i = 0; i < collectors.size(); i++) { |
| aoqi@0 | 49 | GarbageCollectorMXBean collector = collectors.get(i); |
| aoqi@0 | 50 | counts.put(collector.getName(), new ArrayList<Long>(iterations)); |
| aoqi@0 | 51 | } |
| aoqi@0 | 52 | |
| aoqi@0 | 53 | // Perform some gc, record collector counts. |
| aoqi@0 | 54 | for (int i = 0; i < iterations; i++) { |
| aoqi@0 | 55 | System.gc(); |
| aoqi@0 | 56 | addCollectionCount(counts, i); |
| aoqi@0 | 57 | } |
| aoqi@0 | 58 | |
| aoqi@0 | 59 | // Check the increments: |
| aoqi@0 | 60 | // Old gen collectors should increase by one, |
| aoqi@0 | 61 | // New collectors may or may not increase. |
| aoqi@0 | 62 | // Any increase >=2 is unexpected. |
| aoqi@0 | 63 | for (String collector : counts.keySet()) { |
| aoqi@0 | 64 | System.out.println("Checking: " + collector); |
| aoqi@0 | 65 | |
| aoqi@0 | 66 | for (int i = 0; i < iterations - 1; i++) { |
| aoqi@0 | 67 | List<Long> theseCounts = counts.get(collector); |
| aoqi@0 | 68 | long a = theseCounts.get(i); |
| aoqi@0 | 69 | long b = theseCounts.get(i + 1); |
| aoqi@0 | 70 | if (b - a >= 2) { |
| aoqi@0 | 71 | failed = true; |
| aoqi@0 | 72 | errorMessage += "Collector '" + collector + "' has increment " + (b - a) + |
| aoqi@0 | 73 | " at iteration " + i + "\n"; |
| aoqi@0 | 74 | } |
| aoqi@0 | 75 | } |
| aoqi@0 | 76 | } |
| aoqi@0 | 77 | if (failed) { |
| aoqi@0 | 78 | System.err.println(errorMessage); |
| aoqi@0 | 79 | throw new RuntimeException("FAILED: System.gc collections miscounted."); |
| aoqi@0 | 80 | } |
| aoqi@0 | 81 | System.out.println("Passed."); |
| aoqi@0 | 82 | } |
| aoqi@0 | 83 | |
| aoqi@0 | 84 | private static void addCollectionCount(HashMap<String, List> counts, int iteration) { |
| aoqi@0 | 85 | for (int i = 0; i < collectors.size(); i++) { |
| aoqi@0 | 86 | GarbageCollectorMXBean collector = collectors.get(i); |
| aoqi@0 | 87 | List thisList = counts.get(collector.getName()); |
| aoqi@0 | 88 | thisList.add(collector.getCollectionCount()); |
| aoqi@0 | 89 | } |
| aoqi@0 | 90 | } |
| aoqi@0 | 91 | } |
