1 /*
2 * Copyright (c) 2003, 2012, 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 only
63 // one non-heap memory pool
64 private static int[] expectedMinNumPools = {3, 1};
65 private static int[] expectedMaxNumPools = {3, 1};
66 private static int expectedNumGCMgrs = 2;
67 private static int expectedNumMgrs = expectedNumGCMgrs + 1;
68 private static String[] types = { "heap", "non-heap" };
69
70 public static void main(String args[]) throws Exception {
71 Integer value = new Integer(args[0]);
72 expectedNumGCMgrs = value.intValue();
73 expectedNumMgrs = expectedNumGCMgrs + 1;
74
75 checkMemoryPools();
76 checkMemoryManagers();
77 if (testFailed)
78 throw new RuntimeException("TEST FAILED.");
79
80 System.out.println("Test passed.");
81
82 }
83
84 private static void checkMemoryPools() throws Exception {
85 List pools = ManagementFactory.getMemoryPoolMXBeans();
86 boolean hasPerm = false;
87
88 int[] numPools = new int[NUM_TYPES];
89 for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
90 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
91 if (pool.getType() == MemoryType.HEAP) {
92 numPools[HEAP]++;
93 }
94 if (pool.getType() == MemoryType.NON_HEAP) {
95 numPools[NONHEAP]++;
96 }
97 if (pool.getName().toLowerCase().contains("perm")) {
98 hasPerm = true;
99 }
100 }
101
102 if (hasPerm) {
103 // If the VM has perm gen there will be between 2 and 4 non heap
104 // pools (4 if class data sharing is used)
105 expectedMinNumPools[NONHEAP] = 2;
106 expectedMaxNumPools[NONHEAP] = 4;
107 }
108
109 // Check the number of Memory pools
110 for (int i = 0; i < NUM_TYPES; i++) {
111 if (numPools[i] < expectedMinNumPools[i] ||
112 numPools[i] > expectedMaxNumPools[i]) {
113 throw new RuntimeException("TEST FAILED: " +
114 "Number of " + types[i] + " pools = " + numPools[i] +
115 " but expected <= " + expectedMaxNumPools[i] +
116 " and >= " + expectedMinNumPools[i]);
117 }
118 }
119 }
120
121 private static void checkMemoryManagers() throws Exception {
122 List mgrs = ManagementFactory.getMemoryManagerMXBeans();
123
124 int numGCMgr = 0;
125
126 // Check the number of Memory Managers
127 for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
128 MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
129 String[] poolNames = mgr.getMemoryPoolNames();
130 if (poolNames == null || poolNames.length == 0) {
131 throw new RuntimeException("TEST FAILED: " +
132 "Expected to have one or more pools for " +
133 mgr.getName() + "manager.");
134 }
135
136 if (mgr instanceof GarbageCollectorMXBean) {
137 numGCMgr++;
138 } else {
139 for (int i = 0; i < poolNames.length; i++) {
140 checkPoolType(poolNames[i], MemoryType.NON_HEAP);
141 }
142 }
143 }
144
145 if (mgrs.size() != expectedNumMgrs) {
146 throw new RuntimeException("TEST FAILED: " +
147 "Number of memory managers = " + mgrs.size() +
148 " but expected = " + expectedNumMgrs);
149 }
150 if (numGCMgr != expectedNumGCMgrs) {
151 throw new RuntimeException("TEST FAILED: " +
152 "Number of GC managers = " + numGCMgr + " but expected = " +
153 expectedNumGCMgrs);
154 }
155 }
156 private static List pools = ManagementFactory.getMemoryPoolMXBeans();
157 private static void checkPoolType(String name, MemoryType type)
158 throws Exception {
159 for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
160 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
161 if (pool.getName().equals(name)) {
162 if (pool.getType() != type) {
163 throw new RuntimeException("TEST FAILED: " +
164 "Pool " + pool.getName() + " is of type " +
165 pool.getType() + " but expected to be " + type);
166 } else {
167 return;
168 }
169 }
170 }
171 throw new RuntimeException("TEST FAILED: " +
172 "Pool " + name + " is of type " + type +
173 " not found");
174 }
175 }