1 /*
2 * Copyright (c) 2010, 2019, 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 package gc.cms;
25
26 /*
27 * @test TestMBeanCMS.java
28 * @bug 6581734
29 * @requires vm.gc.ConcMarkSweep & !vm.graal.enabled
30 * @summary CMS Old Gen's collection usage is zero after GC which is incorrect
31 * @modules java.management
32 * @run main/othervm -Xmx512m -verbose:gc -XX:+UseConcMarkSweepGC gc.cms.TestMBeanCMS
33 *
34 */
35
36 import java.lang.management.GarbageCollectorMXBean;
37 import java.lang.management.ManagementFactory;
38 import java.lang.management.MemoryPoolMXBean;
39 import java.util.LinkedList;
40 import java.util.List;
41
42 // 6581734 states that memory pool usage via the mbean is wrong
43 // for CMS (zero, even after a collection).
44 //
45 // 6580448 states that the collection count similarly is wrong
46 // (stays at zero for CMS collections)
47 // -- closed as dup of 6581734 as the same fix resolves both.
48
49
50 public class TestMBeanCMS {
51
52 private String poolName = "CMS";
53 private String collectorName = "ConcurrentMarkSweep";
54
55 public static void main(String [] args) {
56
57 TestMBeanCMS t = null;
58 if (args.length==2) {
59 t = new TestMBeanCMS(args[0], args[1]);
60 } else {
61 System.out.println("Defaulting to monitor CMS pool and collector.");
62 t = new TestMBeanCMS();
63 }
64 t.run();
65 }
66
67 public TestMBeanCMS(String pool, String collector) {
68 poolName = pool;
69 collectorName = collector;
70 }
71
72 public TestMBeanCMS() {
73 }
74
75 public void run() {
76 // Use some memory, enough that we expect collections should
77 // have happened.
78 // Must run with options to ensure no stop the world full GC,
79 // but e.g. at least one CMS cycle.
80 allocationWork(300*1024*1024);
81 System.out.println("Done allocationWork");
82
83 // Verify some non-zero results are stored.
84 List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
85 int poolsFound = 0;
86 int poolsWithStats = 0;
87 for (int i=0; i<pools.size(); i++) {
88 MemoryPoolMXBean pool = pools.get(i);
89 String name = pool.getName();
90 System.out.println("found pool: " + name);
91
92 if (name.contains(poolName)) {
93 long usage = pool.getCollectionUsage().getUsed();
94 System.out.println(name + ": usage after GC = " + usage);
95 poolsFound++;
96 if (usage > 0) {
97 poolsWithStats++;
98 }
99 }
100 }
101 if (poolsFound == 0) {
102 throw new RuntimeException("No matching memory pools found: test with -XX:+UseConcMarkSweepGC");
103 }
104
105 List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans();
106 int collectorsFound = 0;
107 int collectorsWithTime= 0;
108 for (int i=0; i<collectors.size(); i++) {
109 GarbageCollectorMXBean collector = collectors.get(i);
110 String name = collector.getName();
111 System.out.println("found collector: " + name);
112 if (name.contains(collectorName)) {
113 collectorsFound++;
114 System.out.println(name + ": collection count = "
115 + collector.getCollectionCount());
116 System.out.println(name + ": collection time = "
117 + collector.getCollectionTime());
118 if (collector.getCollectionCount() <= 0) {
119 throw new RuntimeException("collection count <= 0");
120 }
121 if (collector.getCollectionTime() > 0) {
122 collectorsWithTime++;
123 }
124 }
125 }
126 // verify:
127 if (poolsWithStats < poolsFound) {
128 throw new RuntimeException("pools found with zero stats");
129 }
130
131 if (collectorsWithTime<collectorsFound) {
132 throw new RuntimeException("collectors found with zero time");
133 }
134 System.out.println("Test passed.");
135 }
136
137 public void allocationWork(long target) {
138
139 long sizeAllocated = 0;
140 List list = new LinkedList();
141 long delay = 50;
142 long count = 0;
143
144 while (sizeAllocated < target) {
145 int size = 1024*1024;
146 byte [] alloc = new byte[size];
147 if (count % 2 == 0) {
148 list.add(alloc);
149 sizeAllocated+=size;
150 System.out.print(".");
151 }
152 try { Thread.sleep(delay); } catch (InterruptedException ie) { }
153 count++;
154 }
155 }
156
157 }