Advice I've found on the internet recommends calculating your Apache
MaxClients based on how much RAM your average Apache process takes up. Just glancing at
top, for my site that seems to be around 650KB. I have 32GB of RAM, with MySQL using about 20GB. If I gave Apache just half the remaining, 6GB, then I could supposedly handle ~9231 Apache processes.
But each Apache process spawns a PHP process, doesn't it? And my average PHP process is about 40MB. If I account for that, I get about 147 processes. Vastly different numbers. Can anyone shed any light on this question?