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 6338874
27 * @summary Check that notification dispatch is not linear in number of MBeans.
28 * @author Eamonn McManus
29 *
30 * @library /lib/testlibrary
31 *
32 * @run build jdk.testlibrary.* ListenerScaleTest
33 * @run main ListenerScaleTest
34 */
35
36 /*
37 * The notification dispatch logic in the connector server used to be
38 * linear in the number of listeners there were on any MBean. For
39 * example, if there were 1000 MBeans, each with one listener, then
40 * every time a notification was sent it would be compared against
41 * every one of the 1000 MBeans, even though its source ObjectName was
42 * known and could not possibly match the name of 999 of the MBeans.
43 * This test checks that we no longer have linear behaviour. We do
44 * this by registering just one MBean and measuring the time it takes
45 * to send and receive a certain number of notifications from that
46 * MBean. Then we register many other MBeans, each with a listener,
47 * and we make the same measurement as before. The presence of the
48 * extra MBeans with their listeners should not impact the dispatch
49 * time significantly. If it does, the test fails.
50 *
51 * As usual with timing-sensitive tests, we could potentially get
52 * sporadic failures. We fail if the ratio of the time with many
54 * fix in place, it is usually less than 1, presumably because some
55 * code was being interpreted during the first measurement but had
56 * been compiled by the second.
57 */
58
59 import java.util.concurrent.Semaphore;
60 import javax.management.MBeanServer;
61 import javax.management.MBeanServerConnection;
62 import javax.management.MBeanServerFactory;
63 import javax.management.MalformedObjectNameException;
64 import javax.management.Notification;
65 import javax.management.NotificationBroadcasterSupport;
66 import javax.management.NotificationListener;
67 import javax.management.ObjectName;
68 import javax.management.remote.JMXConnector;
69 import javax.management.remote.JMXConnectorFactory;
70 import javax.management.remote.JMXConnectorServer;
71 import javax.management.remote.JMXConnectorServerFactory;
72 import javax.management.remote.JMXServiceURL;
73
74 import jdk.testlibrary.Platform;
75
76 public class ListenerScaleTest {
77 private static final int WARMUP_WITH_ONE_MBEAN = 1000;
78 private static final int NOTIFS_TO_TIME = 100;
79 private static final int EXTRA_MBEANS = 20000;
80
81 private static final ObjectName testObjectName;
82 static {
83 try {
84 testObjectName = new ObjectName("test:type=Sender,number=-1");
85 } catch (MalformedObjectNameException e) {
86 throw new RuntimeException(e);
87 }
88 }
89
90 private static volatile int nnotifs;
91 private static volatile long startTime;
92 private static volatile long elapsed;
93 private static final Semaphore sema = new Semaphore(0);
94
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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 6338874
27 * @summary Check that notification dispatch is not linear in number of MBeans.
28 * @author Eamonn McManus
29 *
30 * @library /test/lib
31 *
32 * @run build jdk.test.lib.Platform ListenerScaleTest
33 * @run main ListenerScaleTest
34 */
35
36 /*
37 * The notification dispatch logic in the connector server used to be
38 * linear in the number of listeners there were on any MBean. For
39 * example, if there were 1000 MBeans, each with one listener, then
40 * every time a notification was sent it would be compared against
41 * every one of the 1000 MBeans, even though its source ObjectName was
42 * known and could not possibly match the name of 999 of the MBeans.
43 * This test checks that we no longer have linear behaviour. We do
44 * this by registering just one MBean and measuring the time it takes
45 * to send and receive a certain number of notifications from that
46 * MBean. Then we register many other MBeans, each with a listener,
47 * and we make the same measurement as before. The presence of the
48 * extra MBeans with their listeners should not impact the dispatch
49 * time significantly. If it does, the test fails.
50 *
51 * As usual with timing-sensitive tests, we could potentially get
52 * sporadic failures. We fail if the ratio of the time with many
54 * fix in place, it is usually less than 1, presumably because some
55 * code was being interpreted during the first measurement but had
56 * been compiled by the second.
57 */
58
59 import java.util.concurrent.Semaphore;
60 import javax.management.MBeanServer;
61 import javax.management.MBeanServerConnection;
62 import javax.management.MBeanServerFactory;
63 import javax.management.MalformedObjectNameException;
64 import javax.management.Notification;
65 import javax.management.NotificationBroadcasterSupport;
66 import javax.management.NotificationListener;
67 import javax.management.ObjectName;
68 import javax.management.remote.JMXConnector;
69 import javax.management.remote.JMXConnectorFactory;
70 import javax.management.remote.JMXConnectorServer;
71 import javax.management.remote.JMXConnectorServerFactory;
72 import javax.management.remote.JMXServiceURL;
73
74 import jdk.test.lib.Platform;
75
76 public class ListenerScaleTest {
77 private static final int WARMUP_WITH_ONE_MBEAN = 1000;
78 private static final int NOTIFS_TO_TIME = 100;
79 private static final int EXTRA_MBEANS = 20000;
80
81 private static final ObjectName testObjectName;
82 static {
83 try {
84 testObjectName = new ObjectName("test:type=Sender,number=-1");
85 } catch (MalformedObjectNameException e) {
86 throw new RuntimeException(e);
87 }
88 }
89
90 private static volatile int nnotifs;
91 private static volatile long startTime;
92 private static volatile long elapsed;
93 private static final Semaphore sema = new Semaphore(0);
94
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