J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 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 low memory detection of non-heap memory pool. |
| 26 | * |
| 27 | * The test set a listener to be notified when any of the non-heap pools |
| 28 | * exceed 80%. It then starts a thread that continuously loads classes. |
| 29 | * In the HotSpot implementation this causes perm space to be consumed. |
| 30 | * Test completes when we the notification is received or an OutOfMemory |
| 31 | * is generated. |
| 32 | */ |
| 33 | |
| 34 | import java.lang.management.*; |
| 35 | import javax.management.*; |
| 36 | import javax.management.openmbean.CompositeData; |
| 37 | import java.util.*; |
| 38 | |
| 39 | public class LowMemoryTest2 { |
| 40 | |
| 41 | private static volatile boolean listenerInvoked = false; |
| 42 | |
| 43 | private static String INDENT = " "; |
| 44 | |
| 45 | static class SensorListener implements NotificationListener { |
| 46 | public void handleNotification(Notification notif, Object handback) { |
| 47 | String type = notif.getType(); |
| 48 | if (type.equals(MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED) || |
| 49 | type.equals(MemoryNotificationInfo. |
| 50 | MEMORY_COLLECTION_THRESHOLD_EXCEEDED)) { |
| 51 | listenerInvoked = true; |
| 52 | MemoryNotificationInfo minfo = MemoryNotificationInfo. |
| 53 | from((CompositeData) notif.getUserData()); |
| 54 | |
| 55 | System.out.print("Notification for " + minfo.getPoolName()); |
| 56 | System.out.print(" [type = " + type); |
| 57 | System.out.println(" count = " + minfo.getCount() + "]"); |
| 58 | System.out.println(INDENT + "usage = " + minfo.getUsage()); |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | // Loads classes Test100001, Test100002, .... until OutOfMemoryErrror or |
| 64 | // low memory notification |
| 65 | |
| 66 | static class BoundlessLoaderThread extends ClassLoader implements Runnable { |
| 67 | |
| 68 | static int count = 100000; |
| 69 | |
| 70 | Class loadNext() throws ClassNotFoundException { |
| 71 | |
| 72 | // public class TestNNNNNN extends java.lang.Object{ |
| 73 | // public TestNNNNNN(); |
| 74 | // Code: |
| 75 | // 0: aload_0 |
| 76 | // 1: invokespecial #1; //Method java/lang/Object."<init>":()V |
| 77 | // 4: return |
| 78 | // } |
| 79 | |
| 80 | int begin[] = { |
| 81 | 0xca, 0xfe, 0xba, 0xbe, 0x00, 0x00, 0x00, 0x30, |
| 82 | 0x00, 0x0a, 0x0a, 0x00, 0x03, 0x00, 0x07, 0x07, |
| 83 | 0x00, 0x08, 0x07, 0x00, 0x09, 0x01, 0x00, 0x06, |
| 84 | 0x3c, 0x69, 0x6e, 0x69, 0x74, 0x3e, 0x01, 0x00, |
| 85 | 0x03, 0x28, 0x29, 0x56, 0x01, 0x00, 0x04, 0x43, |
| 86 | 0x6f, 0x64, 0x65, 0x0c, 0x00, 0x04, 0x00, 0x05, |
| 87 | 0x01, 0x00, 0x0a, 0x54, 0x65, 0x73, 0x74 }; |
| 88 | |
| 89 | int end [] = { |
| 90 | 0x01, 0x00, 0x10, |
| 91 | 0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e, |
| 92 | 0x67, 0x2f, 0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74, |
| 93 | 0x00, 0x21, 0x00, 0x02, 0x00, 0x03, 0x00, 0x00, |
| 94 | 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x04, |
| 95 | 0x00, 0x05, 0x00, 0x01, 0x00, 0x06, 0x00, 0x00, |
| 96 | 0x00, 0x11, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, |
| 97 | 0x00, 0x05, 0x2a, 0xb7, 0x00, 0x01, 0xb1, 0x00, |
| 98 | 0x00, 0x00, 0x00, 0x00, 0x00 }; |
| 99 | |
| 100 | |
| 101 | // TestNNNNNN |
| 102 | |
| 103 | String name = "Test" + Integer.toString(count++); |
| 104 | |
| 105 | byte value[]; |
| 106 | try { |
| 107 | value = name.substring(4).getBytes("UTF-8"); |
| 108 | } catch (java.io.UnsupportedEncodingException x) { |
| 109 | throw new Error(); |
| 110 | } |
| 111 | |
| 112 | // construct class file |
| 113 | |
| 114 | int len = begin.length + value.length + end.length; |
| 115 | byte b[] = new byte[len]; |
| 116 | int i, pos=0; |
| 117 | for (i=0; i<begin.length; i++) { |
| 118 | b[pos++] = (byte)begin[i]; |
| 119 | } |
| 120 | for (i=0; i<value.length; i++) { |
| 121 | b[pos++] = value[i]; |
| 122 | } |
| 123 | for (i=0; i<end.length; i++) { |
| 124 | b[pos++] = (byte)end[i]; |
| 125 | } |
| 126 | |
| 127 | return defineClass(name, b, 0, b.length); |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Run method for thread that continuously loads classes. |
| 132 | * |
| 133 | * Note: Once the usage threshold has been exceeded the low memory |
| 134 | * detector thread will attempt to deliver its notification - this can |
| 135 | * potentially create a race condition with this thread contining to |
| 136 | * fill up perm space. To avoid the low memory detector getting an OutOfMemory |
| 137 | * we throttle this thread once the threshold has been exceeded. |
| 138 | */ |
| 139 | public void run() { |
| 140 | List pools = ManagementFactory.getMemoryPoolMXBeans(); |
| 141 | boolean thresholdExceeded = false; |
| 142 | |
| 143 | for (;;) { |
| 144 | try { |
| 145 | // the classes are small so we load 10 at a time |
| 146 | for (int i=0; i<10; i++) { |
| 147 | loadNext(); |
| 148 | } |
| 149 | } catch (ClassNotFoundException x) { |
| 150 | return; |
| 151 | } |
| 152 | if (listenerInvoked) { |
| 153 | return; |
| 154 | } |
| 155 | |
| 156 | // if threshold has been exceeded we put in a delay to allow |
| 157 | // the low memory detector do its job. |
| 158 | if (thresholdExceeded) { |
| 159 | try { |
| 160 | Thread.currentThread().sleep(100); |
| 161 | } catch (InterruptedException x) { } |
| 162 | } else { |
| 163 | // check if the threshold has been exceeded |
| 164 | ListIterator i = pools.listIterator(); |
| 165 | while (i.hasNext()) { |
| 166 | MemoryPoolMXBean p = (MemoryPoolMXBean) i.next(); |
| 167 | if (p.getType() == MemoryType.NON_HEAP && |
| 168 | p.isUsageThresholdSupported()) |
| 169 | { |
| 170 | thresholdExceeded = p.isUsageThresholdExceeded(); |
| 171 | } |
| 172 | } |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | public static void main(String args[]) { |
| 179 | ListIterator iter = ManagementFactory.getMemoryPoolMXBeans().listIterator(); |
| 180 | |
| 181 | // Set threshold of 80% of all NON_HEAP memory pools |
| 182 | // In the Hotspot implementation this means we should get a notification |
| 183 | // if the CodeCache or perm generation fills up. |
| 184 | |
| 185 | while (iter.hasNext()) { |
| 186 | MemoryPoolMXBean p = (MemoryPoolMXBean) iter.next(); |
| 187 | if (p.getType() == MemoryType.NON_HEAP && p.isUsageThresholdSupported()) { |
| 188 | |
| 189 | // set threshold |
| 190 | MemoryUsage mu = p.getUsage(); |
| 191 | long threshold = (mu.getMax() * 80) / 100; |
| 192 | |
| 193 | p.setUsageThreshold(threshold); |
| 194 | |
| 195 | System.out.println("Selected memory pool for low memory " + |
| 196 | "detection."); |
| 197 | MemoryUtil.printMemoryPool(p); |
| 198 | |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | |
| 203 | // Install the listener |
| 204 | |
| 205 | MemoryMXBean mm = ManagementFactory.getMemoryMXBean(); |
| 206 | SensorListener l2 = new SensorListener(); |
| 207 | |
| 208 | NotificationEmitter emitter = (NotificationEmitter) mm; |
| 209 | emitter.addNotificationListener(l2, null, null); |
| 210 | |
| 211 | // Start the thread loading classes |
| 212 | |
| 213 | Thread thr = new Thread(new BoundlessLoaderThread()); |
| 214 | thr.start(); |
| 215 | |
| 216 | // Wait for the thread to terminate |
| 217 | try { |
| 218 | thr.join(); |
| 219 | } catch (InterruptedException x) { |
| 220 | throw new RuntimeException(x); |
| 221 | } |
| 222 | |
| 223 | if (listenerInvoked) { |
| 224 | System.out.println("Notification received - test passed."); |
| 225 | } else { |
| 226 | throw new RuntimeException("Test failed - notification not received!"); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | } |