[opencms-dev] I'm still having issues -- Check memory usage

[Paul D. Bain]

At 01:53 PM 12/15/2004, John Giammarche wrote:

>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.

         You may want to check the OpenCMS log file as well as the Tomcat 
log file. Also, determine whether Tomcat is still responding. Perhaps you 
could try to access the servlets that come with Tomcat and are deployed 
when you deploy the typical Tomcat "tarball." If the problem lies with 
Tomcat, then you should consider posting your request on the Tomcat mailing 
list rather than this one.

         Also, try to determine what processes are active and what they are 
doing, especially Tomcat and the JVM. Make sure that the JVM has enough 
memory. You could be running out of memory, especially if you are using 
Tomcat and Oracle on the same machine. I see that you have only 256 MB of 
DRAM. That could be the problem. Use tools such as, for example, the 
commands free, top, or "ps aux | grep catalina."

>  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

         You have just one CPU, but you are using hyperthreading (HT) to 
make it behave as _two_ CPU's, is that correct?

>  RAM: 256 MB

         Two hundred fifty-six (256) MB of memory may not be enough. Try 
using the command "free" to determine how Linux is using memory. If a lot 
of swap space is being using, then virtual memory could be "thrashing."

>  Swap: 1 GB
>  Kernel:  2.4.21-15.0.3.ELsmp

         You are using an SMP kernel? And your machine has only 256 MB of 
DRAM? That is an odd configuration.

>  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