As you would have guessed I have a server setup with mod_php and Apache2 (prefork) with APC . The site receives decent amount of traffic daily and on highest being 280-290 users at the same time. A few days back I started to notice "Can't Allocate Memory" issues with PHP, which weren't happening during low traffic.
General solution for this is to increase the memory limit for PHP in the PHP.ini file. I wanted to know how would that effect performance and overall scalability when I increase the memory limit.
Server Capacity: 8gb Ram, Quad Core i7 ( 920 )
StartServers 80 MinSpareServers 40 MaxSpareServers 60 MaxClients 250 MaxRequestsPerChild 200