Tomcat 5.0.30 OutOfMemory error

[Jack Park <ja...@thinkalong.com>]

I've done a lot of google surfing on this issue. It would seem this is a 
known issue. Some people say to raise the heap. In the manager panel, I 
did that: min=256mb, max=512mp and I gave it 512k stack size (not sure 
if that's even close enough, in fact, I have no idea what that means).

I'm running stress tests on localhost:8080. I'm using the apache 
HttpClient to rapidly access every known URL in the site I'm exercising: 
390 distinct URLs. The database is inmemory (a Hashtable) and HTML is 
painted by way of Velocity. It's a simple site: no large graphics, etc.

When HttpClient fails, I log that a URL was missed.

When I fire up 1, 2, 4, 8, or 16 threads, nothing unhappy is noted. When 
I jump to 32 threads, each running simultaneously, I start to get missed 
URLS. While it's running, I try to access a page from a browser and get 
the 500 error and out of memory.

The java process is calling up 66,500k of heap so it strikes me that the 
OutOfMemory issue isn't related to the heap.

If I try to place
set CATALINA_OPTS= "-Xms256m -Xmx512m -Xss512k"

in catalina.bat, Tomcat won't start at all.

I confess, I'm really confused.  It strikes me that 32 threads banging 
away on Tomcat 5 on a 2.5 ghz Athalon box just on localhost shouldn't be 
all that much stress.

I'll greatly appreciate any concrete suggestions available.
Thanks
Jack


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