1 /*
2 * Copyright (c) 2003, 2016, 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 * @modules jdk.management
32 * @run main MemoryTest 2
33 */
34
35 /*
36 * NOTE: This expected result is hardcoded in this test and this test
37 * will be affected if the heap memory layout is changed in
38 * the future implementation.
39 */
40
41 import java.lang.management.*;
42 import java.util.*;
43
44 public class MemoryTest {
45 private static boolean testFailed = false;
46 private static MemoryMXBean mm = ManagementFactory.getMemoryMXBean();
47 private static final int HEAP = 0;
48 private static final int NONHEAP = 1;
49 private static final int NUM_TYPES = 2;
50
51 // WARNING: if the number of pools changes in the future,
52 // this test needs to be modified to handle different version of VMs.
53
54 // Hotspot VM 1.5 expected to have
55 // heap memory pools = 3 (Eden, Survivor spaces, Old gen)
56 // non-heap memory pools = 2 (Perm gen, Code cache)
57 // or 4 if Class Sharing is enabled.
58 // Number of memory managers = 3
59 // They are: Copy/Scavenger + MSC + CodeCache manager
60 // (or equivalent for other collectors)
61 // Number of GC memory managers = 2
62
63 // Hotspot VM 1.8+ after perm gen removal is expected to have between two
64 // or five non-heap memory pools:
65 // - Code cache (between one and three depending on the -XX:SegmentedCodeCache option)
66 // - Metaspace
67 // - Compressed Class Space (if compressed class pointers are used)
68 private static int[] expectedMinNumPools = {3, 2};
69 private static int[] expectedMaxNumPools = {3, 5};
70 private static int expectedNumGCMgrs = 2;
71 private static int expectedNumMgrs = expectedNumGCMgrs + 2;
72 private static String[] types = { "heap", "non-heap" };
73
74 public static void main(String args[]) throws Exception {
75 Integer value = new Integer(args[0]);
76 expectedNumGCMgrs = value.intValue();
77 expectedNumMgrs = expectedNumGCMgrs + 2;
78
79 checkMemoryPools();
80 checkMemoryManagers();
81 if (testFailed)
82 throw new RuntimeException("TEST FAILED.");
83
84 System.out.println("Test passed.");
85
86 }
87
88 private static void checkMemoryPools() throws Exception {
89 List pools = ManagementFactory.getMemoryPoolMXBeans();
90 boolean hasPerm = false;
91
92 int[] numPools = new int[NUM_TYPES];
93 for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
94 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
95 if (pool.getType() == MemoryType.HEAP) {
96 numPools[HEAP]++;
97 }
98 if (pool.getType() == MemoryType.NON_HEAP) {
99 numPools[NONHEAP]++;
100 }
101 if (pool.getName().toLowerCase().contains("perm")) {
102 hasPerm = true;
103 }
104 }
105
106 if (hasPerm) {
107 // If the VM has perm gen there will be between 2 and 4 non heap
108 // pools (4 if class data sharing is used)
109 expectedMinNumPools[NONHEAP] = 2;
110 expectedMaxNumPools[NONHEAP] = 4;
111 }
112
113 // Check the number of Memory pools
114 for (int i = 0; i < NUM_TYPES; i++) {
115 if (numPools[i] < expectedMinNumPools[i] ||
116 numPools[i] > expectedMaxNumPools[i]) {
117 throw new RuntimeException("TEST FAILED: " +
118 "Number of " + types[i] + " pools = " + numPools[i] +
119 " but expected <= " + expectedMaxNumPools[i] +
120 " and >= " + expectedMinNumPools[i]);
121 }
122 }
123 }
124
125 private static void checkMemoryManagers() throws Exception {
126 List mgrs = ManagementFactory.getMemoryManagerMXBeans();
127
128 int numGCMgr = 0;
129
130 // Check the number of Memory Managers
131 for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
132 MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
133 String[] poolNames = mgr.getMemoryPoolNames();
134 if (poolNames == null || poolNames.length == 0) {
135 throw new RuntimeException("TEST FAILED: " +
136 "Expected to have one or more pools for " +
137 mgr.getName() + "manager.");
138 }
139
140 if (mgr instanceof GarbageCollectorMXBean) {
141 numGCMgr++;
142 } else {
143 for (int i = 0; i < poolNames.length; i++) {
144 checkPoolType(poolNames[i], MemoryType.NON_HEAP);
145 }
146 }
147 }
148
149 if (mgrs.size() != expectedNumMgrs) {
150 throw new RuntimeException("TEST FAILED: " +
151 "Number of memory managers = " + mgrs.size() +
152 " but expected = " + expectedNumMgrs);
153 }
154 if (numGCMgr != expectedNumGCMgrs) {
155 throw new RuntimeException("TEST FAILED: " +
156 "Number of GC managers = " + numGCMgr + " but expected = " +
157 expectedNumGCMgrs);
158 }
159 }
160 private static List pools = ManagementFactory.getMemoryPoolMXBeans();
161 private static void checkPoolType(String name, MemoryType type)
162 throws Exception {
163 for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
164 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
165 if (pool.getName().equals(name)) {
166 if (pool.getType() != type) {
167 throw new RuntimeException("TEST FAILED: " +
168 "Pool " + pool.getName() + " is of type " +
169 pool.getType() + " but expected to be " + type);
170 } else {
171 return;
172 }
173 }
174 }
175 throw new RuntimeException("TEST FAILED: " +
176 "Pool " + name + " is of type " + type +
177 " not found");
178 }
179 }