[users@httpd] Apache with PHP scalability

[Irati Abio]

Hello

I'm defining an scalability policy for a Moodle application. I read the
information abotu worker MPM module and the configuration of Apache http
server (2.2) for this (ThreadPerChild and MaxClients parameters). Is any max
value for this parameters? If our server is having performance problems,
what is the best policy: get more RAM, better processor,...? Is any limit
for the RAM?

Thanks,

Irati