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 }