apache php gd worker MPM

[csgonan]

I am trying to see whether to use worker or prefork with apache on my Solaris 10 server. One post said to set ulimit with worker but I was also told to set it for prefork (not worker) or I will run out of memory.

When I issue prstat I see

http://www is

using 21% and growing and my average

http://www process

is 48M.

5163 www 47M 30M sleep 59 0 0:00:43 0.0% httpd/2

Does ulimit apply to worker or prefork?

I'm using php and their own site says to use prefork but others say to use FastCGI with work.

I know this is a php item, but GD is build into php and some research says gd isn't thread-safe.

Any input would be appreciated.