Urgent! Tomcat4 closed giving Out of Memory Error 2003-12-06 - By qi zhang
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Hi,
I have stunk on this problem for almost 2 weeks. :-(
In these two weeks, I have tried many methods, but it still doesn't work.
I built a system to run TPCW benchmark. One web and application server,
with tomcat4.0 running, one database with mysql4.0 running on it and
several client machines. The Jave version is j2sdk1.4.0_03. The system
worked perfect under light load. But when the number of clients
exceeded some number (like 600), the tomcat4 didn't work anymore.
I checked catalina.out. Sometimes no error message appear, while in some
time it appeared the error:
SEVERE: Caught exception executing
org.apache.tomcat.util.net.TcpWorkerThread@(protected), terminating thread
java.lang.OutOfMemoryError  : unable to create new native thread
at java.lang.Thread (Native Method)
at
org.apache.tomcat.util.threads.ThreadPool $ControlRunnable.<init>(ThreadPool
.java:497)
at
org.apache.tomcat.util.threads.ThreadPool (ThreadPool.java:387)
at
org.apache.tomcat.util.threads.ThreadPool (ThreadPool.java:226)
at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:503)
at
org.apache.tomcat.util.threads.ThreadPool $ControlRunnable.run(ThreadPool.java
:530)
at java.lang.Thread (Thread.java:536)
But my tomcat4 is running with option -server -Xmx1536M. (I also tried to
change -Xss and -Xms, which didn't help.) And the actual memory
utilization was less than 40%. (I have 2GB memory in this machine.)
I also changed 'ulimit -n 8192' and server.xml :
<!-- Define a non-SSL Coyote HTTP/1.1 Connector on port 8080 -->
<Connector className="org.apache.coyote.tomcat4.CoyoteConnector "
port="8080" minProcessors="5" maxProcessors="1750"
enableLookups="true" redirectPort="8443"
acceptCount="1000" debug="0" connectionTimeout="-1"
useURIValidationHack="false" disableUploadTimeout="true" />
<!-- Note : To disable connection timeouts, set connectionTimeout
value to -1 -->
Why this error happened? I was trying to use strace -f -p to trace the
system call, but it only gave me one line "accept(13, " and waited at that
point. Did anyone meet this problem before? Can I get some detailed error
log besided catalina.out?
I really appreciate your kind help.
Qi
--
Qi Zhang, Ph.D Student
Department of Computer Science,
College of William and Mary
P.O. Box 8795
Williamsburg, VA 23187-8795
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