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comparison test/gc/7072527/TestFullGCCount.java @ 10176:bfe3be9ebd6c

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7109087: gc/7072527/TestFullGCCount.java fails when GC is set in command-line Reviewed-by: mgerdin
author kevinw
date Thu, 18 Apr 2013 17:02:20 +0100
parents 41e6ee74f879
children
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10103:07a4efc5ed14 10176:bfe3be9ebd6c
1 /* 1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 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. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
23 23
24 /* 24 /*
25 * @test TestFullGCount.java 25 * @test TestFullGCount.java
26 * @bug 7072527 26 * @bug 7072527
27 * @summary CMS: JMM GC counters overcount in some cases 27 * @summary CMS: JMM GC counters overcount in some cases
28 * @run main/othervm -XX:+UseConcMarkSweepGC TestFullGCCount 28 * @run main/othervm -XX:+PrintGC TestFullGCCount
29 *
30 */ 29 */
31 import java.util.*; 30 import java.util.*;
32 import java.lang.management.*; 31 import java.lang.management.*;
33 32
33 /*
34 * Originally for a specific failure in CMS, this test now monitors all
35 * collectors for double-counting of collections.
36 */
34 public class TestFullGCCount { 37 public class TestFullGCCount {
35 38
36 public String collectorName = "ConcurrentMarkSweep"; 39 static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
37 40
38 public static void main(String [] args) { 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>();
39 46
40 TestFullGCCount t = null; 47 // Prime the collection of count lists for all collectors.
41 if (args.length==2) { 48 for (int i = 0; i < collectors.size(); i++) {
42 t = new TestFullGCCount(args[0], args[1]); 49 GarbageCollectorMXBean collector = collectors.get(i);
43 } else { 50 counts.put(collector.getName(), new ArrayList<Long>(iterations));
44 t = new TestFullGCCount();
45 } 51 }
46 System.out.println("Monitoring collector: " + t.collectorName);
47 t.run();
48 }
49 52
50 public TestFullGCCount(String pool, String collector) { 53 // Perform some gc, record collector counts.
51 collectorName = collector; 54 for (int i = 0; i < iterations; i++) {
52 } 55 System.gc();
56 addCollectionCount(counts, i);
57 }
53 58
54 public TestFullGCCount() { 59 // Check the increments:
55 } 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);
56 65
57 public void run() { 66 for (int i = 0; i < iterations - 1; i++) {
58 int count = 0; 67 List<Long> theseCounts = counts.get(collector);
59 int iterations = 20; 68 long a = theseCounts.get(i);
60 long counts[] = new long[iterations]; 69 long b = theseCounts.get(i + 1);
61 boolean diffAlways2 = true; // assume we will fail 70 if (b - a >= 2) {
62 71 failed = true;
63 for (int i=0; i<iterations; i++) { 72 errorMessage += "Collector '" + collector + "' has increment " + (b - a) +
64 System.gc(); 73 " at iteration " + i + "\n";
65 counts[i] = getCollectionCount();
66 if (i>0) {
67 if (counts[i] - counts[i-1] != 2) {
68 diffAlways2 = false;
69 } 74 }
70 } 75 }
71 } 76 }
72 if (diffAlways2) { 77 if (failed) {
73 throw new RuntimeException("FAILED: System.gc must be incrementing count twice."); 78 System.err.println(errorMessage);
79 throw new RuntimeException("FAILED: System.gc collections miscounted.");
74 } 80 }
75 System.out.println("Passed."); 81 System.out.println("Passed.");
76 } 82 }
77 83
78 private long getCollectionCount() { 84 private static void addCollectionCount(HashMap<String, List> counts, int iteration) {
79 long count = 0; 85 for (int i = 0; i < collectors.size(); i++) {
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); 86 GarbageCollectorMXBean collector = collectors.get(i);
84 String name = collector.getName(); 87 List thisList = counts.get(collector.getName());
85 if (name.contains(collectorName)) { 88 thisList.add(collector.getCollectionCount());
86 System.out.println(name + ": collection count = "
87 + collector.getCollectionCount());
88 count = collector.getCollectionCount();
89 }
90 } 89 }
91 return count;
92 } 90 }
93
94 } 91 }
95