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Woah. OK, what's that mean?
ab is ApacheBench – it will keep 5 connections to our site open, continously, for the next 300 seconds.
RSS (Resident Set Size) ~= “how much RAM does each of these processes take.”
We're eating ~45MB per Apache child, we have 7974MB of RAM, and we want to reserve 1GB or so for the system and for cache. That leaves:
7000MB / 45MB/child = 155 Children