Re: apc improvements

On Fri, Jun 10, 2005 at 02:19:21PM -0700, Rasmus Lerdorf wrote: > > > Gonzalo Arana wrote: > > Hi, > > > > I've tested apc in one of my apaches, and I've got this results: > > > > context switches (from vmstat) > > w/out apc: 4k/sec > > with apc: 200k/sec > > > > running processes (from 'vmstat 1') > > w/out apc: 0-9 > > with apc: 20-100 > > Wait a second, why do you have more running processes with APC? That > makes no sense to me and makes all your other numbers rather meaningless In fact, yes it does (at least I think). I gues this is a 'thunerding herd' problem (too many processes waiting for a rwlock, the lock is released, and all processes are awaked, but only one gets the lock). This would explain why the number of context switches have increased drastically. > since it doesn't look like you are comparing similar Apache configurations. Actually the figures are from the same web server, same apache configuration, and same http traffic. The only difference is with apc turned on and turned off. Regards, G.