in your screenshot of "top", all are php process, no mysql process seen.
if mysql is on the same machine, so likely mysql is not the bottle-neck.
also, check mysql slow query log, if any query take long time.
when WaitQ is high, check
to see if many mysql query piling there.
>So no way to get more than the 2000 limit? Or are you saying I should never hit the 2000 limit?
yes, per my experience. if there is 1000 lsphp5 process running(let alone 2000), and WaitQ is keeping high, something must be wrong(for example, database blocking there), increasing the number of process number won't help at all.
Last edited by NiteWave; 05-09-2013 at 12:27 AM..