In a continued effort to keep this site online all the time I’m looking for some help in tuning apache2. Earlier today we ran into some serious performance issues based on what I had it tuned to, which caused 3/4 of the total swap to be used. NOT a good idea.
In the meantime I have turned things down a bit in the prefork MPM section, but I’m wondering what other tips the community has. What values do you suggest in prefork MPM for performance tuning?
The box is a quad-core xen vps with 512M. I have 5,000+ unique visitors a day on this site in addition to the dozen other blogs hosted (none near as popular). What can I do to keep up with the traffic, yet keep the load down on the machine for performance?