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 *
33 * @run main MemoryTest 2
34 */
35
36 /*
37 * NOTE: This expected result is hardcoded in this test and this test
38 * will be affected if the heap memory layout is changed in
39 * the future implementation.
40 */
41
42 import java.lang.management.*;
43 import java.util.*;
44
45 public class MemoryTest {
46 private static boolean testFailed = false;
47 private static MemoryMXBean mm = ManagementFactory.getMemoryMXBean();
48 private static final int HEAP = 0;
49 private static final int NONHEAP = 1;
50 private static final int NUM_TYPES = 2;
51
52 // WARNING: if the number of pools changes in the future,
53 // this test needs to be modified to handle different version of VMs.
54
55 // Hotspot VM 1.5 expected to have
56 // heap memory pools = 3 (Eden, Survivor spaces, Old gen)
57 // non-heap memory pools = 2 (Perm gen, Code cache)
58 // or 4 if Class Sharing is enabled.
59 // Number of memory managers = 3
60 // They are: Copy/Scavenger + MSC + CodeCache manager
61 // (or equivalent for other collectors)
62 // Number of GC memory managers = 2
63
64 // Hotspot VM 1.8+ after perm gen removal is expected to have between two
65 // or five non-heap memory pools:
66 // - Code cache (between one and three depending on the -XX:SegmentedCodeCache option)
67 // - Metaspace
68 // - Compressed Class Space (if compressed class pointers are used)
69 private static int[] expectedMinNumPools = {3, 2};
70 private static int[] expectedMaxNumPools = {3, 5};
71 private static int expectedNumGCMgrs = 2;
72 private static int expectedNumMgrs = expectedNumGCMgrs + 2;
73 private static String[] types = { "heap", "non-heap" };
74
75 public static void main(String args[]) throws Exception {
76 Integer value = new Integer(args[0]);
77 expectedNumGCMgrs = value.intValue();
78 expectedNumMgrs = expectedNumGCMgrs + 2;
79
80 checkMemoryPools();
81 checkMemoryManagers();
82 if (testFailed)
83 throw new RuntimeException("TEST FAILED.");
84
85 System.out.println("Test passed.");
86
87 }
88
89 private static void checkMemoryPools() throws Exception {
90 List pools = ManagementFactory.getMemoryPoolMXBeans();
91 boolean hasPerm = false;
92
93 int[] numPools = new int[NUM_TYPES];
94 for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
95 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
96 if (pool.getType() == MemoryType.HEAP) {
97 numPools[HEAP]++;
98 }
99 if (pool.getType() == MemoryType.NON_HEAP) {
100 numPools[NONHEAP]++;
101 }
102 if (pool.getName().toLowerCase().contains("perm")) {
103 hasPerm = true;
104 }
105 }
106
107 if (hasPerm) {
108 // If the VM has perm gen there will be between 2 and 4 non heap
109 // pools (4 if class data sharing is used)
110 expectedMinNumPools[NONHEAP] = 2;
111 expectedMaxNumPools[NONHEAP] = 4;
112 }
113
114 // Check the number of Memory pools
115 for (int i = 0; i < NUM_TYPES; i++) {
116 if (numPools[i] < expectedMinNumPools[i] ||
117 numPools[i] > expectedMaxNumPools[i]) {
118 throw new RuntimeException("TEST FAILED: " +
119 "Number of " + types[i] + " pools = " + numPools[i] +
120 " but expected <= " + expectedMaxNumPools[i] +
121 " and >= " + expectedMinNumPools[i]);
122 }
123 }
124 }
125
126 private static void checkMemoryManagers() throws Exception {
127 List mgrs = ManagementFactory.getMemoryManagerMXBeans();
128
129 int numGCMgr = 0;
130
131 // Check the number of Memory Managers
132 for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
133 MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
134 String[] poolNames = mgr.getMemoryPoolNames();
135 if (poolNames == null || poolNames.length == 0) {
136 throw new RuntimeException("TEST FAILED: " +
137 "Expected to have one or more pools for " +
138 mgr.getName() + "manager.");
139 }
140
141 if (mgr instanceof GarbageCollectorMXBean) {
142 numGCMgr++;
143 } else {
144 for (int i = 0; i < poolNames.length; i++) {
145 checkPoolType(poolNames[i], MemoryType.NON_HEAP);
146 }
147 }
148 }
149
150 if (mgrs.size() != expectedNumMgrs) {
151 throw new RuntimeException("TEST FAILED: " +
152 "Number of memory managers = " + mgrs.size() +
153 " but expected = " + expectedNumMgrs);
154 }
155 if (numGCMgr != expectedNumGCMgrs) {
156 throw new RuntimeException("TEST FAILED: " +
157 "Number of GC managers = " + numGCMgr + " but expected = " +
158 expectedNumGCMgrs);
159 }
160 }
161 private static List pools = ManagementFactory.getMemoryPoolMXBeans();
162 private static void checkPoolType(String name, MemoryType type)
163 throws Exception {
164 for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
165 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
166 if (pool.getName().equals(name)) {
167 if (pool.getType() != type) {
168 throw new RuntimeException("TEST FAILED: " +
169 "Pool " + pool.getName() + " is of type " +
170 pool.getType() + " but expected to be " + type);
171 } else {
172 return;
173 }
174 }
175 }
176 throw new RuntimeException("TEST FAILED: " +
177 "Pool " + name + " is of type " + type +
178 " not found");
179 }
180 }