J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 4892507 |
| 27 | * @summary Basic Test for MemoryPool.resetPeakUsage() |
| 28 | * @author Mandy Chung |
| 29 | * |
| 30 | * @build ResetPeakMemoryUsage MemoryUtil |
| 31 | * @run main ResetPeakMemoryUsage |
| 32 | */ |
| 33 | |
| 34 | import java.lang.management.*; |
| 35 | import java.util.*; |
| 36 | |
| 37 | public class ResetPeakMemoryUsage { |
| 38 | private static MemoryMXBean mbean = ManagementFactory.getMemoryMXBean(); |
| 39 | private static List pools = ManagementFactory.getMemoryPoolMXBeans(); |
| 40 | private static MemoryPoolMXBean mpool = null; |
| 41 | |
| 42 | public static void main(String[] argv) { |
| 43 | ListIterator iter = pools.listIterator(); |
| 44 | while (iter.hasNext()) { |
| 45 | MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next(); |
| 46 | if (p.getType() == MemoryType.HEAP && |
| 47 | p.isUsageThresholdSupported()) { |
| 48 | mpool = p; |
| 49 | System.out.println("Selected memory pool: "); |
| 50 | MemoryUtil.printMemoryPool(mpool); |
| 51 | break; |
| 52 | } |
| 53 | } |
| 54 | if (mpool == null) { |
| 55 | throw new RuntimeException("No heap pool found with threshold != -1"); |
| 56 | } |
| 57 | |
| 58 | MemoryUsage usage0 = mpool.getUsage(); |
| 59 | MemoryUsage peak0 = mpool.getPeakUsage(); |
| 60 | final long largeArraySize = (usage0.getMax() - usage0.getUsed()) / 10; |
| 61 | |
| 62 | System.out.println("Before big object is allocated: "); |
| 63 | printMemoryUsage(); |
| 64 | |
| 65 | // Allocate a big array - need to allocate from the old gen |
| 66 | Object[][][] obj = new Object[1][1][(int) largeArraySize]; |
| 67 | |
| 68 | System.out.println("After the object is allocated: "); |
| 69 | printMemoryUsage(); |
| 70 | |
| 71 | MemoryUsage usage1 = mpool.getUsage(); |
| 72 | MemoryUsage peak1 = mpool.getPeakUsage(); |
| 73 | |
| 74 | if (usage1.getUsed() <= usage0.getUsed()) { |
| 75 | throw new RuntimeException( |
| 76 | formatSize("Before allocation: used", usage0.getUsed()) + |
| 77 | " expected to be > " + |
| 78 | formatSize("After allocation: used", usage1.getUsed())); |
| 79 | } |
| 80 | |
| 81 | if (peak1.getUsed() <= peak0.getUsed()) { |
| 82 | throw new RuntimeException( |
| 83 | formatSize("Before allocation: peak", peak0.getUsed()) + |
| 84 | " expected to be > " + |
| 85 | formatSize("After allocation: peak", peak1.getUsed())); |
| 86 | } |
| 87 | |
| 88 | |
| 89 | // The object is now garbage and do a GC |
| 90 | // memory usage should drop |
| 91 | obj = null; |
| 92 | mbean.gc(); |
| 93 | |
| 94 | System.out.println("After GC: "); |
| 95 | printMemoryUsage(); |
| 96 | |
| 97 | MemoryUsage usage2 = mpool.getUsage(); |
| 98 | MemoryUsage peak2 = mpool.getPeakUsage(); |
| 99 | |
| 100 | if (usage2.getUsed() >= usage1.getUsed()) { |
| 101 | throw new RuntimeException( |
| 102 | formatSize("Before GC: used", usage1.getUsed()) + " " + |
| 103 | " expected to be > " + |
| 104 | formatSize("After GC: used", usage2.getUsed())); |
| 105 | } |
| 106 | |
| 107 | if (peak2.getUsed() != peak1.getUsed()) { |
| 108 | throw new RuntimeException( |
| 109 | formatSize("Before GC: peak", peak1.getUsed()) + " " + |
| 110 | " expected to be equal to " + |
| 111 | formatSize("After GC: peak", peak2.getUsed())); |
| 112 | } |
| 113 | |
| 114 | mpool.resetPeakUsage(); |
| 115 | |
| 116 | System.out.println("After resetPeakUsage: "); |
| 117 | printMemoryUsage(); |
| 118 | |
| 119 | MemoryUsage usage3 = mpool.getUsage(); |
| 120 | MemoryUsage peak3 = mpool.getPeakUsage(); |
| 121 | |
| 122 | if (peak3.getUsed() != usage3.getUsed()) { |
| 123 | throw new RuntimeException( |
| 124 | formatSize("After resetting peak: peak", peak3.getUsed()) + " " + |
| 125 | " expected to be equal to " + |
| 126 | formatSize("current used", usage3.getUsed())); |
| 127 | } |
| 128 | |
| 129 | if (peak3.getUsed() >= peak2.getUsed()) { |
| 130 | throw new RuntimeException( |
| 131 | formatSize("After resetting peak: peak", peak3.getUsed()) + " " + |
| 132 | " expected to be < " + |
| 133 | formatSize("previous peak", peak2.getUsed())); |
| 134 | } |
| 135 | |
| 136 | System.out.println("Test passed."); |
| 137 | } |
| 138 | |
| 139 | private static String INDENT = " "; |
| 140 | private static void printMemoryUsage() { |
| 141 | MemoryUsage current = mpool.getUsage(); |
| 142 | MemoryUsage peak = mpool.getPeakUsage(); |
| 143 | System.out.println("Current Usage: "); |
| 144 | MemoryUtil.printMemoryUsage(current); |
| 145 | System.out.println("Peak Usage: "); |
| 146 | MemoryUtil.printMemoryUsage(peak); |
| 147 | |
| 148 | } |
| 149 | private static String formatSize(String name, long value) { |
| 150 | StringBuffer buf = new StringBuffer(name + " = " + value); |
| 151 | if (value > 0) { |
| 152 | buf.append(" (" + (value >> 10) + "K)"); |
| 153 | } |
| 154 | return buf.toString(); |
| 155 | } |
| 156 | } |