1 /*
2 * Copyright (c) 2010, 2014, 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 * @requires vm.gc=="ConcMarkSweep" | vm.gc=="null"
28 * @summary CMS Old Gen's collection usage is zero after GC which is incorrect
29 * @run main/othervm -Xmx512m -verbose:gc -XX:+UseConcMarkSweepGC Test6581734
30 *
31 */
32 import java.util.*;
33 import java.lang.management.*;
34
35 // 6581734 states that memory pool usage via the mbean is wrong
36 // for CMS (zero, even after a collection).
37 //
38 // 6580448 states that the collection count similarly is wrong
39 // (stays at zero for CMS collections)
40 // -- closed as dup of 6581734 as the same fix resolves both.
41
42
43 public class Test6581734 {
44
45 private String poolName = "CMS";
46 private String collectorName = "ConcurrentMarkSweep";
47
48 public static void main(String [] args) {
49
50 Test6581734 t = null;
51 if (args.length==2) {
52 t = new Test6581734(args[0], args[1]);
53 } else {
54 System.out.println("Defaulting to monitor CMS pool and collector.");
55 t = new Test6581734();
56 }
57 t.run();
58 }
59
60 public Test6581734(String pool, String collector) {
61 poolName = pool;
62 collectorName = collector;
63 }
64
65 public Test6581734() {
66 }
67
68 public void run() {
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 allocationWork(300*1024*1024);
74 System.out.println("Done allocationWork");
75
76 // Verify some non-zero results are stored.
77 List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
78 int poolsFound = 0;
79 int poolsWithStats = 0;
80 for (int i=0; i<pools.size(); i++) {
81 MemoryPoolMXBean pool = pools.get(i);
82 String name = pool.getName();
83 System.out.println("found pool: " + name);
84
85 if (name.contains(poolName)) {
86 long usage = pool.getCollectionUsage().getUsed();
87 System.out.println(name + ": usage after GC = " + usage);
88 poolsFound++;
89 if (usage > 0) {
90 poolsWithStats++;
91 }
92 }
93 }
94 if (poolsFound == 0) {
95 throw new RuntimeException("No matching memory pools found: test with -XX:+UseConcMarkSweepGC");
96 }
97
98 List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
99 int collectorsFound = 0;
100 int collectorsWithTime= 0;
101 for (int i=0; i<collectors.size(); i++) {
102 GarbageCollectorMXBean collector = collectors.get(i);
103 String name = collector.getName();
104 System.out.println("found collector: " + name);
105 if (name.contains(collectorName)) {
106 collectorsFound++;
107 System.out.println(name + ": collection count = "
108 + collector.getCollectionCount());
109 System.out.println(name + ": collection time = "
110 + collector.getCollectionTime());
111 if (collector.getCollectionCount() <= 0) {
112 throw new RuntimeException("collection count <= 0");
113 }
114 if (collector.getCollectionTime() > 0) {
115 collectorsWithTime++;
116 }
117 }
118 }
119 // verify:
120 if (poolsWithStats < poolsFound) {
121 throw new RuntimeException("pools found with zero stats");
122 }
123
124 if (collectorsWithTime<collectorsFound) {
125 throw new RuntimeException("collectors found with zero time");
126 }
127 System.out.println("Test passed.");
128 }
129
130 public void allocationWork(long target) {
131
132 long sizeAllocated = 0;
133 List list = new LinkedList();
134 long delay = 50;
135 long count = 0;
136
137 while (sizeAllocated < target) {
138 int size = 1024*1024;
139 byte [] alloc = new byte[size];
140 if (count % 2 == 0) {
141 list.add(alloc);
142 sizeAllocated+=size;
143 System.out.print(".");
144 }
145 try { Thread.sleep(delay); } catch (InterruptedException ie) { }
146 count++;
147 }
148 }
149
150 }