On Tue, Feb 1, 2011 at 10:33 PM, Caldarale, Charles R
<[email protected]> wrote:
>> From: jan gestre [mailto:[email protected]]
>> Subject: Optimize CPU Hogging Tomcat 6
>
>> We have an Apache Tomcat 6 server (HA cluster using DRBD) that is
>> hogging the CPU, this happens when there are simultaneous users
>> accessing at the same time, which should be considered normal because
>> they're only 30. How will I optimize Tomcat?
>
> Highly unlikely that you need to optimize Tomcat. Much more likely that you
> have a bug in your webapp. Take thread dumps and see who is spending time
> where.
>
> http://wiki.apache.org/tomcat/HowTo#How_do_I_obtain_a_thread_dump_of_my_running_webapp_.3F
>
> - Chuck
Hi Chuck,
Here's a snippet of the thread dump using jstack:
Deadlock Detection:
No deadlocks found.
Thread 12288: (state = BLOCKED)
Error occurred during stack walking:
Locked ownable synchronizers:
- None
Thread 12287: (state = BLOCKED)
Error occurred during stack walking:
Locked ownable synchronizers:
- None
Thread 12285: (state = BLOCKED)
Error occurred during stack walking:
Locked ownable synchronizers:
- None
Thread 12284: (state = BLOCKED)
Error occurred during stack walking:
Locked ownable synchronizers:
- None
Thread 12283: (state = BLOCKED)
Error occurred during stack walking:
Locked ownable synchronizers:
- None
Thread 12282: (state = BLOCKED)
Error occurred during stack walking:
Locked ownable synchronizers:
- None
Thread 12281: (state = BLOCKED)
Error occurred during stack walking:
Locked ownable synchronizers:
- None
----
Also, here's my catalina log:
tail -f /web/tomcat/tomcat6/logs/catalina.2011-02-01.log
Feb 1, 2011 10:19:04 PM org.apache.tomcat.util.net.JIoEndpoint$Acceptor run
SEVERE: Socket accept failed
java.net.SocketException: Too many open files
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:390)
at java.net.ServerSocket.implAccept(ServerSocket.java:453)
at java.net.ServerSocket.accept(ServerSocket.java:421)
at
org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:61)
at
org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:352)
at java.lang.Thread.run(Thread.java:619)
---
Regards,
Jan
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