Iplanet 4.1 catastrophe error message

All,

Running an Iplanet 4.1 web server on HPUX 11.0. Web Server housing static content, Server Side JavaScript, Java Applets, Java Servlets, JSP pages and CGI. Have recently deployed new apps and believe that we have reached the capacity of the server. Server is reaching 100% CPU utilization approx every 2 hrs and requires a restart to return to a working state.

Am recieving the following lines in my Error log:

[17/Dec/2002:10:33:10] catastrophe ( 2564): pool-create-block: out of memory

[17/Dec/2002:10:33:10] catastrophe ( 2564): pool-create: out of memory

Have scoured the Internet to find information pertaining to these errors but have come up with nothing. All content seems to be geared towards the new Sun One Server (i.e. Iplanet 6.0).

Any suggestions or resources that you could offer would be greatly appreciated.

Thanks,

Steph.

[914 byte] By [705780] at [2007-11-25 8:38:50]