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 3
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
69 private static int[] expectedMinNumPools = new int[2];
70 private static int[] expectedMaxNumPools = new int[2];
71 private static int expectedNumGCMgrs;
72 private static int expectedNumMgrs;
73 private static String[] types = { "heap", "non-heap" };
74
75 public static void main(String args[]) throws Exception {
76 expectedNumGCMgrs = Integer.valueOf(args[0]);
77 expectedNumMgrs = expectedNumGCMgrs + 2;
78
79 int expectedNumPools = Integer.valueOf(args[1]);
80 expectedMinNumPools[HEAP] = expectedNumPools;
81 expectedMaxNumPools[HEAP] = expectedNumPools;
82
83 expectedMinNumPools[NONHEAP] = 2;
84 expectedMaxNumPools[NONHEAP] = 5;
85
86 checkMemoryPools();
87 checkMemoryManagers();
88 if (testFailed)
89 throw new RuntimeException("TEST FAILED.");
90
91 System.out.println("Test passed.");
92
93 }
94
95 private static void checkMemoryPools() throws Exception {
96 List pools = ManagementFactory.getMemoryPoolMXBeans();
97 boolean hasPerm = false;
98
99 int[] numPools = new int[NUM_TYPES];
100 for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
101 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
102 if (pool.getType() == MemoryType.HEAP) {
103 numPools[HEAP]++;
104 }
105 if (pool.getType() == MemoryType.NON_HEAP) {
106 numPools[NONHEAP]++;
107 }
108 if (pool.getName().toLowerCase().contains("perm")) {
109 hasPerm = true;
110 }
111 }
112
113 if (hasPerm) {
114 // If the VM has perm gen there will be between 2 and 4 non heap
115 // pools (4 if class data sharing is used)
116 expectedMinNumPools[NONHEAP] = 2;
117 expectedMaxNumPools[NONHEAP] = 4;
118 }
119
120 // Check the number of Memory pools
121 for (int i = 0; i < NUM_TYPES; i++) {
122 if (numPools[i] < expectedMinNumPools[i] ||
123 numPools[i] > expectedMaxNumPools[i]) {
124 throw new RuntimeException("TEST FAILED: " +
125 "Number of " + types[i] + " pools = " + numPools[i] +
126 " but expected <= " + expectedMaxNumPools[i] +
127 " and >= " + expectedMinNumPools[i]);
128 }
129 }
130 }
131
132 private static void checkMemoryManagers() throws Exception {
133 List mgrs = ManagementFactory.getMemoryManagerMXBeans();
134
135 int numGCMgr = 0;
136
137 // Check the number of Memory Managers
138 for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
139 MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
140 String[] poolNames = mgr.getMemoryPoolNames();
141 if (poolNames == null || poolNames.length == 0) {
142 throw new RuntimeException("TEST FAILED: " +
143 "Expected to have one or more pools for " +
144 mgr.getName() + "manager.");
145 }
146
147 if (mgr instanceof GarbageCollectorMXBean) {
148 numGCMgr++;
149 } else {
150 for (int i = 0; i < poolNames.length; i++) {
151 checkPoolType(poolNames[i], MemoryType.NON_HEAP);
152 }
153 }
154 }
155
156 if (mgrs.size() != expectedNumMgrs) {
157 throw new RuntimeException("TEST FAILED: " +
158 "Number of memory managers = " + mgrs.size() +
159 " but expected = " + expectedNumMgrs);
160 }
161 if (numGCMgr != expectedNumGCMgrs) {
162 throw new RuntimeException("TEST FAILED: " +
163 "Number of GC managers = " + numGCMgr + " but expected = " +
164 expectedNumGCMgrs);
165 }
166 }
167 private static List pools = ManagementFactory.getMemoryPoolMXBeans();
168 private static void checkPoolType(String name, MemoryType type)
169 throws Exception {
170 for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
171 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
172 if (pool.getName().equals(name)) {
173 if (pool.getType() != type) {
174 throw new RuntimeException("TEST FAILED: " +
175 "Pool " + pool.getName() + " is of type " +
176 pool.getType() + " but expected to be " + type);
177 } else {
178 return;
179 }
180 }
181 }
182 throw new RuntimeException("TEST FAILED: " +
183 "Pool " + name + " is of type " + type +
184 " not found");
185 }
186 }