1 /*
2 * Copyright (c) 2010, 2015, 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
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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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 */
23
24 /*
25 * @test Test6581734.java
26 * @bug 6581734
27 * @requires vm.gc=="ConcMarkSweep" | vm.gc=="null"
28 * @summary CMS Old Gen's collection usage is zero after GC which is incorrect
29 * @modules java.management
30 * @run main/othervm -Xmx512m -verbose:gc -XX:+UseConcMarkSweepGC Test6581734
31 *
32 */
33 import java.util.*;
34 import java.lang.management.*;
35
36 // 6581734 states that memory pool usage via the mbean is wrong
37 // for CMS (zero, even after a collection).
38 //
39 // 6580448 states that the collection count similarly is wrong
40 // (stays at zero for CMS collections)
41 // -- closed as dup of 6581734 as the same fix resolves both.
42
43
44 public class Test6581734 {
45
46 private String poolName = "CMS";
47 private String collectorName = "ConcurrentMarkSweep";
48
49 public static void main(String [] args) {
50
51 Test6581734 t = null;
52 if (args.length==2) {
53 t = new Test6581734(args[0], args[1]);
54 } else {
55 System.out.println("Defaulting to monitor CMS pool and collector.");
56 t = new Test6581734();
57 }
58 t.run();
59 }
60
61 public Test6581734(String pool, String collector) {
62 poolName = pool;
63 collectorName = collector;
64 }
65
66 public Test6581734() {
67 }
68
69 public void run() {
70 // Use some memory, enough that we expect collections should
71 // have happened.
72 // Must run with options to ensure no stop the world full GC,
73 // but e.g. at least one CMS cycle.
74 allocationWork(300*1024*1024);
75 System.out.println("Done allocationWork");
76
77 // Verify some non-zero results are stored.
78 List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
79 int poolsFound = 0;
80 int poolsWithStats = 0;
81 for (int i=0; i<pools.size(); i++) {
82 MemoryPoolMXBean pool = pools.get(i);
83 String name = pool.getName();
84 System.out.println("found pool: " + name);
85
86 if (name.contains(poolName)) {
87 long usage = pool.getCollectionUsage().getUsed();
88 System.out.println(name + ": usage after GC = " + usage);
89 poolsFound++;
90 if (usage > 0) {
91 poolsWithStats++;
92 }
93 }
94 }
95 if (poolsFound == 0) {
96 throw new RuntimeException("No matching memory pools found: test with -XX:+UseConcMarkSweepGC");
97 }
98
99 List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
100 int collectorsFound = 0;
101 int collectorsWithTime= 0;
102 for (int i=0; i<collectors.size(); i++) {
103 GarbageCollectorMXBean collector = collectors.get(i);
104 String name = collector.getName();
105 System.out.println("found collector: " + name);
106 if (name.contains(collectorName)) {
107 collectorsFound++;
108 System.out.println(name + ": collection count = "
109 + collector.getCollectionCount());
110 System.out.println(name + ": collection time = "
111 + collector.getCollectionTime());
112 if (collector.getCollectionCount() <= 0) {
113 throw new RuntimeException("collection count <= 0");
114 }
115 if (collector.getCollectionTime() > 0) {
116 collectorsWithTime++;
117 }
118 }
119 }
120 // verify:
121 if (poolsWithStats < poolsFound) {
122 throw new RuntimeException("pools found with zero stats");
123 }
124
125 if (collectorsWithTime<collectorsFound) {
126 throw new RuntimeException("collectors found with zero time");
127 }
128 System.out.println("Test passed.");
129 }
130
131 public void allocationWork(long target) {
132
133 long sizeAllocated = 0;
134 List list = new LinkedList();
135 long delay = 50;
136 long count = 0;
137
138 while (sizeAllocated < target) {
139 int size = 1024*1024;
140 byte [] alloc = new byte[size];
141 if (count % 2 == 0) {
142 list.add(alloc);
143 sizeAllocated+=size;
144 System.out.print(".");
145 }
146 try { Thread.sleep(delay); } catch (InterruptedException ie) { }
147 count++;
148 }
149 }
150
151 }