J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2006 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 6338874 |
| 27 | * @summary Check that notification dispatch is not linear in number of MBeans. |
| 28 | * @author Eamonn McManus |
| 29 | */ |
| 30 | |
| 31 | /* |
| 32 | * The notification dispatch logic in the connector server used to be |
| 33 | * linear in the number of listeners there were on any MBean. For |
| 34 | * example, if there were 1000 MBeans, each with one listener, then |
| 35 | * every time a notification was sent it would be compared against |
| 36 | * every one of the 1000 MBeans, even though its source ObjectName was |
| 37 | * known and could not possibly match the name of 999 of the MBeans. |
| 38 | * This test checks that we no longer have linear behaviour. We do |
| 39 | * this by registering just one MBean and measuring the time it takes |
| 40 | * to send and receive a certain number of notifications from that |
| 41 | * MBean. Then we register many other MBeans, each with a listener, |
| 42 | * and we make the same measurement as before. The presence of the |
| 43 | * extra MBeans with their listeners should not impact the dispatch |
| 44 | * time significantly. If it does, the test fails. |
| 45 | * |
| 46 | * As usual with timing-sensitive tests, we could potentially get |
| 47 | * sporadic failures. We fail if the ratio of the time with many |
| 48 | * MBeans to the time with just one MBean is more than 100. With the |
| 49 | * fix in place, it is usually less than 1, presumably because some |
| 50 | * code was being interpreted during the first measurement but had |
| 51 | * been compiled by the second. |
| 52 | */ |
| 53 | |
| 54 | import java.lang.management.ManagementFactory; |
| 55 | import javax.management.*; |
| 56 | import javax.management.remote.*; |
| 57 | import java.util.concurrent.*; |
| 58 | |
| 59 | public class ListenerScaleTest { |
| 60 | private static final int WARMUP_WITH_ONE_MBEAN = 1000; |
| 61 | private static final int NOTIFS_TO_TIME = 100; |
| 62 | private static final int EXTRA_MBEANS = 20000; |
| 63 | |
| 64 | private static final MBeanServer mbs = |
| 65 | ManagementFactory.getPlatformMBeanServer(); |
| 66 | private static final ObjectName testObjectName; |
| 67 | static { |
| 68 | try { |
| 69 | testObjectName = new ObjectName("test:type=Sender,number=-1"); |
| 70 | } catch (MalformedObjectNameException e) { |
| 71 | throw new RuntimeException(e); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | private static volatile int nnotifs; |
| 76 | private static volatile long startTime; |
| 77 | private static volatile long elapsed; |
| 78 | private static final Semaphore sema = new Semaphore(0); |
| 79 | |
| 80 | private static final NotificationListener timingListener = |
| 81 | new NotificationListener() { |
| 82 | public void handleNotification(Notification n, Object h) { |
| 83 | if (++nnotifs == NOTIFS_TO_TIME) { |
| 84 | elapsed = System.nanoTime() - startTime; |
| 85 | sema.release(); |
| 86 | } |
| 87 | } |
| 88 | }; |
| 89 | |
| 90 | private static final long timeNotif() { |
| 91 | try { |
| 92 | startTime = System.nanoTime(); |
| 93 | nnotifs = 0; |
| 94 | mbs.invoke(testObjectName, "send", null, null); |
| 95 | sema.acquire(); |
| 96 | return elapsed; |
| 97 | } catch (Exception e) { |
| 98 | throw new RuntimeException(e); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | public static interface SenderMBean { |
| 103 | public void send(); |
| 104 | } |
| 105 | |
| 106 | public static class Sender extends NotificationBroadcasterSupport |
| 107 | implements SenderMBean { |
| 108 | public void send() { |
| 109 | for (int i = 0; i < NOTIFS_TO_TIME; i++) |
| 110 | sendNotification(new Notification("type", this, 1L)); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | private static final NotificationListener nullListener = |
| 115 | new NotificationListener() { |
| 116 | public void handleNotification(Notification n, Object h) {} |
| 117 | }; |
| 118 | |
| 119 | public static void main(String[] args) throws Exception { |
| 120 | MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); |
| 121 | Sender sender = new Sender(); |
| 122 | mbs.registerMBean(sender, testObjectName); |
| 123 | JMXServiceURL url = new JMXServiceURL("service:jmx:rmi://"); |
| 124 | JMXConnectorServer cs = |
| 125 | JMXConnectorServerFactory.newJMXConnectorServer(url, null, mbs); |
| 126 | cs.start(); |
| 127 | JMXServiceURL addr = cs.getAddress(); |
| 128 | JMXConnector cc = JMXConnectorFactory.connect(addr); |
| 129 | try { |
| 130 | test(mbs, cs, cc); |
| 131 | } finally { |
| 132 | cc.close(); |
| 133 | cs.stop(); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | private static void test(MBeanServer mbs, JMXConnectorServer cs, |
| 138 | JMXConnector cc) throws Exception { |
| 139 | MBeanServerConnection mbsc = cc.getMBeanServerConnection(); |
| 140 | mbsc.addNotificationListener(testObjectName, timingListener, null, null); |
| 141 | long singleMBeanTime = 0; |
| 142 | for (int i = 0; i < WARMUP_WITH_ONE_MBEAN; i++) |
| 143 | singleMBeanTime = timeNotif(); |
| 144 | if (singleMBeanTime == 0) |
| 145 | singleMBeanTime = 1; |
| 146 | System.out.println("Time with a single MBean: " + singleMBeanTime + "ns"); |
| 147 | System.out.println("Now registering " + EXTRA_MBEANS + " MBeans"); |
| 148 | for (int i = 0; i < EXTRA_MBEANS; i++) { |
| 149 | ObjectName on = new ObjectName("test:type=Sender,number=" + i); |
| 150 | mbs.registerMBean(new Sender(), on); |
| 151 | if (i % 1000 == 999) { |
| 152 | System.out.print("..." + (i+1)); |
| 153 | System.out.flush(); |
| 154 | } |
| 155 | } |
| 156 | System.out.println(); |
| 157 | System.out.println("Now registering " + EXTRA_MBEANS + " listeners"); |
| 158 | for (int i = 0; i < EXTRA_MBEANS; i++) { |
| 159 | ObjectName on = new ObjectName("test:type=Sender,number=" + i); |
| 160 | mbsc.addNotificationListener(on, nullListener, null, null); |
| 161 | if (i % 1000 == 999) { |
| 162 | System.out.print("..." + (i+1)); |
| 163 | System.out.flush(); |
| 164 | } |
| 165 | } |
| 166 | System.out.println(); |
| 167 | System.out.println("Timing a notification send now"); |
| 168 | long manyMBeansTime = timeNotif(); |
| 169 | System.out.println("Time with many MBeans: " + manyMBeansTime + "ns"); |
| 170 | double ratio = (double) manyMBeansTime / singleMBeanTime; |
| 171 | if (ratio > 100.0) |
| 172 | throw new Exception("Failed: ratio=" + ratio); |
| 173 | System.out.println("Test passed: ratio=" + ratio); |
| 174 | } |
| 175 | } |