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 * @requires vm.gc != "Z"
30 * @author Mandy Chung
31 *
32 * @modules jdk.management
33 * @run main MemoryTest 2 3
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
70 private static int[] expectedMinNumPools = new int[2];
71 private static int[] expectedMaxNumPools = new int[2];
72 private static int expectedNumGCMgrs;
73 private static int expectedNumMgrs;
74 private static String[] types = { "heap", "non-heap" };
75
76 public static void main(String args[]) throws Exception {
77 expectedNumGCMgrs = Integer.valueOf(args[0]);
78 expectedNumMgrs = expectedNumGCMgrs + 2;
79
80 int expectedNumPools = Integer.valueOf(args[1]);
81 expectedMinNumPools[HEAP] = expectedNumPools;
82 expectedMaxNumPools[HEAP] = expectedNumPools;
83
84 expectedMinNumPools[NONHEAP] = 2;
85 expectedMaxNumPools[NONHEAP] = 5;
86
87 checkMemoryPools();
88 checkMemoryManagers();
89 if (testFailed)
90 throw new RuntimeException("TEST FAILED.");
91
92 System.out.println("Test passed.");
93
94 }
95
96 private static void checkMemoryPools() throws Exception {
97 List pools = ManagementFactory.getMemoryPoolMXBeans();
98 boolean hasPerm = false;
99
100 int[] numPools = new int[NUM_TYPES];
101 for (ListIterator iter = pools.listIterator(); iter.hasNext();) {
102 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
103 if (pool.getType() == MemoryType.HEAP) {
104 numPools[HEAP]++;
105 }
106 if (pool.getType() == MemoryType.NON_HEAP) {
107 numPools[NONHEAP]++;
108 }
109 if (pool.getName().toLowerCase().contains("perm")) {
110 hasPerm = true;
111 }
112 }
113
114 if (hasPerm) {
115 // If the VM has perm gen there will be between 2 and 4 non heap
116 // pools (4 if class data sharing is used)
117 expectedMinNumPools[NONHEAP] = 2;
118 expectedMaxNumPools[NONHEAP] = 4;
119 }
120
121 // Check the number of Memory pools
122 for (int i = 0; i < NUM_TYPES; i++) {
123 if (numPools[i] < expectedMinNumPools[i] ||
124 numPools[i] > expectedMaxNumPools[i]) {
125 throw new RuntimeException("TEST FAILED: " +
126 "Number of " + types[i] + " pools = " + numPools[i] +
127 " but expected <= " + expectedMaxNumPools[i] +
128 " and >= " + expectedMinNumPools[i]);
129 }
130 }
131 }
132
133 private static void checkMemoryManagers() throws Exception {
134 List mgrs = ManagementFactory.getMemoryManagerMXBeans();
135
136 int numGCMgr = 0;
137
138 // Check the number of Memory Managers
139 for (ListIterator iter = mgrs.listIterator(); iter.hasNext();) {
140 MemoryManagerMXBean mgr = (MemoryManagerMXBean) iter.next();
141 String[] poolNames = mgr.getMemoryPoolNames();
142 if (poolNames == null || poolNames.length == 0) {
143 throw new RuntimeException("TEST FAILED: " +
144 "Expected to have one or more pools for " +
145 mgr.getName() + "manager.");
146 }
147
148 if (mgr instanceof GarbageCollectorMXBean) {
149 numGCMgr++;
150 } else {
151 for (int i = 0; i < poolNames.length; i++) {
152 checkPoolType(poolNames[i], MemoryType.NON_HEAP);
153 }
154 }
155 }
156
157 if (mgrs.size() != expectedNumMgrs) {
158 throw new RuntimeException("TEST FAILED: " +
159 "Number of memory managers = " + mgrs.size() +
160 " but expected = " + expectedNumMgrs);
161 }
162 if (numGCMgr != expectedNumGCMgrs) {
163 throw new RuntimeException("TEST FAILED: " +
164 "Number of GC managers = " + numGCMgr + " but expected = " +
165 expectedNumGCMgrs);
166 }
167 }
168 private static List pools = ManagementFactory.getMemoryPoolMXBeans();
169 private static void checkPoolType(String name, MemoryType type)
170 throws Exception {
171 for (ListIterator iter = pools.listIterator(); iter.hasNext(); ) {
172 MemoryPoolMXBean pool = (MemoryPoolMXBean) iter.next();
173 if (pool.getName().equals(name)) {
174 if (pool.getType() != type) {
175 throw new RuntimeException("TEST FAILED: " +
176 "Pool " + pool.getName() + " is of type " +
177 pool.getType() + " but expected to be " + type);
178 } else {
179 return;
180 }
181 }
182 }
183 throw new RuntimeException("TEST FAILED: " +
184 "Pool " + name + " is of type " + type +
185 " not found");
186 }
187 }