1 /*
2 * Copyright (c) 2003, 2004, 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 private static int[] expectedMinNumPools = {3, 2};
62 private static int[] expectedMaxNumPools = {3, 4};
63 private static int expectedNumGCMgrs = 2;
64 private static int expectedNumMgrs = expectedNumGCMgrs + 1;
65 private static String[] types = { "heap", "non-heap" };
66
67 public static void main(String args[]) throws Exception {
68 Integer value = new Integer(args[0]);
69 expectedNumGCMgrs = value.intValue();
70 expectedNumMgrs = expectedNumGCMgrs + 1;
71
72 checkMemoryPools();
73 checkMemoryManagers();
74 if (testFailed)
75 throw new RuntimeException("TEST FAILED.");
76
77 System.out.println("Test passed.");
78
79 }
80
81 private static void checkMemoryPools() throws Exception {
82 List pools = ManagementFactory.getMemoryPoolMXBeans();
83 boolean hasPerm = false;
84
85 int[] numPools = new int[NUM_TYPES];
86 for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
87 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
88 if (pool.getType() == MemoryType.HEAP) {
89 numPools[HEAP]++;
90 }
91 if (pool.getType() == MemoryType.NON_HEAP) {
92 numPools[NONHEAP]++;
93 }
94 if (pool.getName().toLowerCase().contains("perm")) {
95 hasPerm = true;
96 }
97 }
98
99 if (!hasPerm) {
100 // If the VM does not have a perm gen there will be only one non heap pool
101 expectedMinNumPools[NONHEAP] = 1;
102 expectedMaxNumPools[NONHEAP] = 1;
103 }
104
105 // Check the number of Memory pools
106 for (int i = 0; i < NUM_TYPES; i++) {
107 if (numPools[i] < expectedMinNumPools[i] ||
108 numPools[i] > expectedMaxNumPools[i]) {
109 throw new RuntimeException("TEST FAILED: " +
110 "Number of " + types[i] + " pools = " + numPools[i] +
111 " but expected <= " + expectedMaxNumPools[i] +
112 " and >= " + expectedMinNumPools[i]);
113 }
114 }
115 }
116
117 private static void checkMemoryManagers() throws Exception {
118 List mgrs = ManagementFactory.getMemoryManagerMXBeans();
119
120 int numGCMgr = 0;
121
122 // Check the number of Memory Managers
123 for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
124 MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
125 String[] poolNames = mgr.getMemoryPoolNames();
126 if (poolNames == null || poolNames.length == 0) {
127 throw new RuntimeException("TEST FAILED: " +
128 "Expected to have one or more pools for " +
129 mgr.getName() + "manager.");
130 }
131
132 if (mgr instanceof GarbageCollectorMXBean) {
133 numGCMgr++;
134 } else {
135 for (int i = 0; i < poolNames.length; i++) {
136 checkPoolType(poolNames[i], MemoryType.NON_HEAP);
137 }
138 }
139 }
140
141 if (mgrs.size() != expectedNumMgrs) {
142 throw new RuntimeException("TEST FAILED: " +
143 "Number of memory managers = " + mgrs.size() +
144 " but expected = " + expectedNumMgrs);
145 }
146 if (numGCMgr != expectedNumGCMgrs) {
147 throw new RuntimeException("TEST FAILED: " +
148 "Number of GC managers = " + numGCMgr + " but expected = " +
149 expectedNumGCMgrs);
150 }
151 }
152 private static List pools = ManagementFactory.getMemoryPoolMXBeans();
153 private static void checkPoolType(String name, MemoryType type)
154 throws Exception {
155 for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
156 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
157 if (pool.getName().equals(name)) {
158 if (pool.getType() != type) {
159 throw new RuntimeException("TEST FAILED: " +
160 "Pool " + pool.getName() + " is of type " +
161 pool.getType() + " but expected to be " + type);
162 } else {
163 return;
164 }
165 }
166 }
167 throw new RuntimeException("TEST FAILED: " +
168 "Pool " + name + " is of type " + type +
169 " not found");
170 }
171 }