We have an unusual memory problem. I have to reduce JBoss's heap size to keep from
running out of memory. We are running JBoss 3.2.5 on HPUX 11.11. We are using JBossMQ
and the internal Tomcat. We have a series of standalone java apps that produce and
consume messages in addition to other apps that use ejb's. JBossMQ is using an oracle
9i db for the datastore. The UNIX machine has 4GB of memory. The
machine is dedicated to JBoss and 4 standalone java jms listener apps.
The failure scenario is as follows.
App1, a standalone java app, gets information from a db table, sends the information
to a servlet running in the internal tomcat which parses and packages the data and
sends a jms message appropriate to the data. Some messages go to queue's others to
topics with durable
subscribers.
App2 is a standalone java app that durably subscribes to various topics, filters
messages, reformats selected messages and places the reformatted messages on a queue.
App3 is a standalone java application that pulls some of App2's reformatted messages
from the queue and applies business logic using ejb's.
Under moderate load, several thousand messages pending, all standalone java apps
processing messages, 4000 to 5000 messages processed in this run, we are receiving
the following error
2004-09-14 13:33:04,131 DEBUG
[org.jboss.mq.referenceable.SpyConnectionFactoryObjectFactory] The
GenericConnectionFactory is: [EMAIL PROTECTED]
connectionProperties={UIL_ADDRESS_KEY=10.101.1.10, UIL_CHUNKSIZE_KEY=1000000,
UIL_TCPNODELAY_KEY=yes, ClientILService=org.jboss.mq.il.uil2.UILClientILService,
UIL_PORT_KEY=8093, UIL_BUFFERSIZE_KEY=2048, PingPeriod=60000}]
2004-09-14 13:33:04,135 DEBUG [org.jboss.mq.il.uil2.SocketManager] Begin ReadTask.run
2004-09-14 13:33:04,137 DEBUG [org.jboss.mq.il.uil2.SocketManager] Begin WriteTask.run
2004-09-14 13:33:04,138 DEBUG [org.jboss.mq.il.uil2.SocketManager] Created
ObjectOutputStream
2004-09-14 13:33:04,138 DEBUG [org.jboss.mq.il.uil2.SocketManager] Begin ReadTask.run
2004-09-14 13:33:04,138 DEBUG [org.jboss.mq.il.uil2.SocketManager] Begin WriteTask.run
2004-09-14 13:33:04,138 DEBUG [org.jboss.mq.il.uil2.SocketManager] Created
ObjectInputStream
2004-09-14 13:33:04,138 DEBUG [org.jboss.mq.il.uil2.SocketManager] Created
ObjectOutputStream
2004-09-14 13:33:04,140 DEBUG [org.jboss.mq.il.uil2.SocketManager] Exiting on
unexpected error in read task
java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start(Native Method)
at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor.addThread(PooledExecutor.java:520)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor.execute(PooledExecutor.java:880)
at org.jboss.mq.il.uil2.SocketManager$ReadTask.run(SocketManager.java:296)
at java.lang.Thread.run(Thread.java:534)
20
JBoss is configured with 1GB of memory. When the system fails, HP GLANCE reports 40%
of physical memory free. JBoss reports 600 or so megs of free heapspace via the jboss
web-console. There
are 1300 - 2000 active threads in JBoss. It appears that JBoss threads are being
created and free'ed smoothly, the memory and thread number constantly
increase/decrease. The unix box is configured to allow 6000 threads per process. File
handles etc are greater than 20,000. The failures seem to follow a spike in threads
but it is not necessarily related to the thread high water mark. It does not get to
2000 threads and fail, it gets to 2000, drops back to 1300, spikes to 1500 and fails.
The details are
of course different for every failure.
Paradoxically, if I reduce the JBoss heap to 384 megs the entire message run processes
without error. The thread count is somewhat reduced and we dont seem to hit the wild
fluctuations that seem to proceed a failure.
I am not sure what forum to place this in. Any ideas will be greatly appreciated.
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