1 /*
2 * Copyright (c) 2003, 2013, 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
26 * @bug 4530538
27 * @summary Basic unit test of MemoryMXBean.getMemoryPools() and
28 * MemoryMXBean.getMemoryManager().
29 * @author Mandy Chung
30 *
31 * @run main MemoryTest 2
32 */
33
34 /*
35 * NOTE: This expected result is hardcoded in this test and this test
36 * will be affected if the heap memory layout is changed in
37 * the future implementation.
38 */
39
40 import java.lang.management.*;
41 import java.util.*;
42
43 public class MemoryTest {
44 private static boolean testFailed = false;
45 private static MemoryMXBean mm = ManagementFactory.getMemoryMXBean();
46 private static final int HEAP = 0;
47 private static final int NONHEAP = 1;
48 private static final int NUM_TYPES = 2;
49
50 // WARNING: if the number of pools changes in the future,
51 // this test needs to be modified to handle different version of VMs.
52
53 // Hotspot VM 1.5 expected to have
54 // heap memory pools = 3 (Eden, Survivor spaces, Old gen)
55 // non-heap memory pools = 2 (Perm gen, Code cache)
56 // or 4 if Class Sharing is enabled.
57 // Number of memory managers = 3
58 // They are: Copy/Scavenger + MSC + CodeCache manager
59 // (or equivalent for other collectors)
60 // Number of GC memory managers = 2
61
62 // Hotspot VM 1.8+ after perm gen removal is expected to have between two
63 // or five non-heap memory pools:
64 // - Code cache (between one and three depending on the -XX:SegmentedCodeCache option)
65 // - Metaspace
66 // - Compressed Class Space (if compressed class pointers are used)
67 private static int[] expectedMinNumPools = {3, 2};
68 private static int[] expectedMaxNumPools = {3, 5};
69 private static int expectedNumGCMgrs = 2;
70 private static int expectedNumMgrs = expectedNumGCMgrs + 2;
71 private static String[] types = { "heap", "non-heap" };
72
73 public static void main(String args[]) throws Exception {
74 Integer value = new Integer(args[0]);
75 expectedNumGCMgrs = value.intValue();
76 expectedNumMgrs = expectedNumGCMgrs + 2;
77
78 checkMemoryPools();
79 checkMemoryManagers();
80 if (testFailed)
81 throw new RuntimeException("TEST FAILED.");
82
83 System.out.println("Test passed.");
84
85 }
86
87 private static void checkMemoryPools() throws Exception {
88 List pools = ManagementFactory.getMemoryPoolMXBeans();
89 boolean hasPerm = false;
90
91 int[] numPools = new int[NUM_TYPES];
92 for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
93 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
94 if (pool.getType() == MemoryType.HEAP) {
95 numPools[HEAP]++;
96 }
97 if (pool.getType() == MemoryType.NON_HEAP) {
98 numPools[NONHEAP]++;
99 }
100 if (pool.getName().toLowerCase().contains("perm")) {
101 hasPerm = true;
102 }
103 }
104
105 if (hasPerm) {
106 // If the VM has perm gen there will be between 2 and 4 non heap
107 // pools (4 if class data sharing is used)
108 expectedMinNumPools[NONHEAP] = 2;
109 expectedMaxNumPools[NONHEAP] = 4;
110 }
111
112 // Check the number of Memory pools
113 for (int i = 0; i < NUM_TYPES; i++) {
114 if (numPools[i] < expectedMinNumPools[i] ||
115 numPools[i] > expectedMaxNumPools[i]) {
116 throw new RuntimeException("TEST FAILED: " +
117 "Number of " + types[i] + " pools = " + numPools[i] +
118 " but expected <= " + expectedMaxNumPools[i] +
119 " and >= " + expectedMinNumPools[i]);
120 }
121 }
122 }
123
124 private static void checkMemoryManagers() throws Exception {
125 List mgrs = ManagementFactory.getMemoryManagerMXBeans();
126
127 int numGCMgr = 0;
128
129 // Check the number of Memory Managers
130 for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
131 MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
132 String[] poolNames = mgr.getMemoryPoolNames();
133 if (poolNames == null || poolNames.length == 0) {
134 throw new RuntimeException("TEST FAILED: " +
135 "Expected to have one or more pools for " +
136 mgr.getName() + "manager.");
137 }
138
139 if (mgr instanceof GarbageCollectorMXBean) {
140 numGCMgr++;
141 } else {
142 for (int i = 0; i < poolNames.length; i++) {
143 checkPoolType(poolNames[i], MemoryType.NON_HEAP);
144 }
145 }
146 }
147
148 if (mgrs.size() != expectedNumMgrs) {
149 throw new RuntimeException("TEST FAILED: " +
150 "Number of memory managers = " + mgrs.size() +
151 " but expected = " + expectedNumMgrs);
152 }
153 if (numGCMgr != expectedNumGCMgrs) {
154 throw new RuntimeException("TEST FAILED: " +
155 "Number of GC managers = " + numGCMgr + " but expected = " +
156 expectedNumGCMgrs);
157 }
158 }
159 private static List pools = ManagementFactory.getMemoryPoolMXBeans();
160 private static void checkPoolType(String name, MemoryType type)
161 throws Exception {
162 for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
163 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
164 if (pool.getName().equals(name)) {
165 if (pool.getType() != type) {
166 throw new RuntimeException("TEST FAILED: " +
167 "Pool " + pool.getName() + " is of type " +
168 pool.getType() + " but expected to be " + type);
169 } else {
170 return;
171 }
172 }
173 }
174 throw new RuntimeException("TEST FAILED: " +
175 "Pool " + name + " is of type " + type +
176 " not found");
177 }
178 }