1 /*
2 * Copyright (c) 2010, 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 Test6581734.java
26 * @bug 6581734
27 * @summary CMS Old Gen's collection usage is zero after GC which is incorrect
28 * @run main/othervm -server -Xmx512m -verbose:gc -XX:+UseConcMarkSweepGC Test6581734
29 *
30 */
31 import java.util.*;
32 import java.lang.management.*;
33
34 // 6581734 states that memory pool usage via the mbean is wrong
35 // for CMS (zero, even after a collection).
36 //
37 // 6580448 states that the collection count similarly is wrong
38 // (stays at zero for CMS collections)
39 // -- closed as dup of 6581734 as the same fix resolves both.
40
41
42 public class Test6581734 {
43
44 private String poolName = "CMS";
45 private String collectorName = "ConcurrentMarkSweep";
46
47 public static void main(String [] args) {
48
49 Test6581734 t = null;
50 if (args.length==2) {
51 t = new Test6581734(args[0], args[1]);
52 } else {
53 System.out.println("Defaulting to monitor CMS pool and collector.");
54 t = new Test6581734();
55 }
56 t.run();
57
58 }
59
60 public Test6581734(String pool, String collector) {
61 poolName = pool;
62 collectorName = collector;
63 }
64 public Test6581734() {
65 }
66
67 public void run() {
68
69 // Use some memory, enough that we expect collections should
70 // have happened.
71 // Must run with options to ensure no stop the world full GC,
72 // but e.g. at least one CMS cycle.
73
74 allocationWork(300*1024*1024);
75 System.out.println("Done allocationWork");
76
77 // Verify some non-zero results are stored.
78
79 List<MemoryPoolMXBean> pools =
80 ManagementFactory.getMemoryPoolMXBeans();
81 int poolsFound = 0;
82 int poolsWithStats = 0;
83 for (int i=0; i<pools.size(); i++) {
84 MemoryPoolMXBean pool = pools.get(i);
85 String name = pool.getName();
86 System.out.println("found pool: " + name);
87
88 if (name.contains(poolName)) {
89 long usage = pool.getCollectionUsage().getUsed();
90 System.out.println(name + ": usage after GC = " + usage);
91 poolsFound++;
92 if (usage > 0) {
93 poolsWithStats++;
94 }
95 }
96 }
97 if (poolsFound == 0) {
98 throw new RuntimeException(
99 "No matching memory pools found: test with -XX:+UseConcMarkSweepGC");
100 }
101
102 List<GarbageCollectorMXBean> collectors =
103 ManagementFactory.getGarbageCollectorMXBeans();
104 int collectorsFound = 0;
105 int collectorsWithTime= 0;
106 for (int i=0; i<collectors.size(); i++) {
107 GarbageCollectorMXBean collector = collectors.get(i);
108 String name = collector.getName();
109 System.out.println("found collector: " + name);
110 if (name.contains(collectorName)) {
111 collectorsFound++;
112
113 System.out.println(name + ": collection count = "
114 + collector.getCollectionCount());
115 System.out.println(name + ": collection time = "
116 + collector.getCollectionTime());
117 if (collector.getCollectionCount() <= 0) {
118 throw new RuntimeException("collection count <= 0");
119 }
120 if (collector.getCollectionTime() > 0) {
121 collectorsWithTime++;
122 }
123 }
124 }
125 // verify:
126 if (poolsWithStats < poolsFound) {
127 throw new RuntimeException("pools found with zero stats");
128 }
129
130 if (collectorsWithTime<collectorsFound) {
131 throw new RuntimeException("collectors found with zero time");
132
133 }
134
135 System.out.println("Test passed.");
136 }
137
138
139 public void allocationWork(long target) {
140
141 long sizeAllocated = 0;
142 List list = new LinkedList();
143 long delay = 50;
144 long count = 0;
145
146 while (sizeAllocated < target) {
147 int size = 1024*1024;
148
149 byte [] alloc = new byte[size];
150 if (count % 2 == 0) {
151 list.add(alloc);
152 sizeAllocated+=size;
153 System.out.print(".");
154 //System.out.println("allocated = " + sizeAllocated + " target = " + target);
155 }
156
157 try { Thread.sleep(delay); } catch (InterruptedException ie) { }
158 count++;
159 }
160 }
161
162
163
164 }