Cache CPU utilisation problems on Tomcat 5.5.7 on Windows 2003

2005-05-23 Thread Andrew Stevens 
Hi,

 

I am a complete newbie to Tomcat so please forgive me...

 

I have two problems:

 

1.  Cache - Tomcat will cache everything to /temp and even when the
underlying content (images or pages) are changed, it will not refresh. I
have to stop the server, delete all files in the /temp directory and
then restart Tomcat to get the new content delivered to the browser.
This cache can build in size to gigabytes.

 

2.  CPU utilisation - Tomcat often hits 99% CPU and just stays there
until the server just comes to a grinding halt. This could of course be
a coding issue in a JSP or what have you, but my error logs are not
pointing to anything unusual.

 

Has anyone else had similar experiences? Do you have any tips for me?

 

Thank you, your help is appreciated.

 

Cheers,

 

Andrew

Re: Cache CPU utilisation problems on Tomcat 5.5.7 on Windows 2003

2005-05-23 Thread Will Hartung 
 From: Andrew Stevens [EMAIL PROTECTED]
 Sent: Monday, May 23, 2005 6:43 PM

 1. Cache -

Can't help here, sorry...

 2. CPU utilisation - Tomcat often hits 99% CPU and just stays there
 until the server just comes to a grinding halt. This could of course be
 a coding issue in a JSP or what have you, but my error logs are not
 pointing to anything unusual.

What do your GC stats look like? (-verbose:gc) Is TC out of memory and
fighting itself? Even worse, is Tomcat swapping? (Java no like swapping, no
sir. Bad. Really Bad.) Remember that your Java will allocate more memory
than what you may specify on the command line, that only limits the heap
size for the JVM, not how much Java takes overall.

I've had Tomcat when hammered go into a thrashing spin lock on Solaris, this
was 4.1.x, though. It was rare, we only caught it once, and it was obviously
fighting among itself for some locks. That wasn't pretty. But it eventually
sorted itself out. No idea what caused it, and I can't consistently
duplicate it.

Regards,

Will Hartung
([EMAIL PROTECTED])


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