[opencms-dev] I'm still having stability issues with OpenCMS

[Brendon Price]

Hi John,

A couple of possible idea's on what could be happening:

1. We had a similar problem on our production Oracle 9i database server. Due to a misconfiguration of the switch it was connected to, the Linux machine negotiated a 100Mb Half-duplex connection which meant we experienced a huge number of collisions and dropped packets. When the server was under load it would lose and have to recreate the Oracle connections. This caused the front end server running Apache and Tomcat to spawn hundreds of Apache threads to deal with the backlog of requests. When we re-configured the network interface to be 100Mb full duplex the server recovered immediately and the 500 Apache threads dropped back to a manageable 40 threads.
I was surprised at the Huge impact this network setting had on the server. This may not be your issue but would be worth checking.

2. Oracle 9i and OpenCMS 5.0.0 had a deadlock issue that caused it to hang when creating new Oracle connections. The only way around this for us was to re-write the Data interaction layer using Oracle native connection pooling. Im not sure if the issue continued on into OpenCMS 5.0.1 but the whole data integration layer was re-written in OpenCMS 6.0 (so I think it has since been resolved in the newest version of the product).

I hope this provides some other things to look at.

Regards
Brendon

-----Original Message-----
From: opencms-dev-bounces at opencms.org
[mailto:opencms-dev-bounces at opencms.org]On Behalf Of John Giammarche
Sent: Thursday, 16 December 2004 7:53 a.m.
To: The OpenCms mailing list
Subject: [opencms-dev] I'm still having stability issues with OpenCMS


Hello everyone...I'm still having problems with my
production server, but I'm closer to finding a
solution.

The last words in catalina.out are:

SEVERE: All threads (175) are currently busy, waiting.
Increase maxThreads (175) or check the servlet status

Then the java process remains active, but OpenCMS
doesn't respond to any requests. As you see, I changed
the max number of processors from 75 to 600, but the
problem persists.

I've tried to run tomcat wrapped in the Java Servide
Wrapper from Tanuki Software, but it doesn't restar
the JVM when I need it. Today OpenCMS stopped
responding and I didn't even get the SEVERE error
message...I don't know if that is the real problem, or
wwhat to do...

I paste below again my machine specs:

 CPU: Pentium IV 2.8 Ghz, HT enabled
 RAM: 256 MB
 Swap: 1 GB
 Kernel:  2.4.21-15.0.3.ELsmp
 OpenCMS version: 5.0.1 (Kaitain)
 Oracle version: Oracle9i Release 9.2.0.4.0 -
 Production
 Tomcat version: 4.1.31
 Apache version: 2.0.50

I hope someone can help me, because this is a
production server and I have no clue...

regards,

John


		
__________________________________ 
Do you Yahoo!? 
All your favorites on one personal page - Try My Yahoo!
http://my.yahoo.com 


_______________________________________________
This mail is send to you from the opencms-dev mailing list
To change your list options, or to unsubscribe from the list, please visit
http://mail.opencms.org/mailman/listinfo/opencms-dev