Re: [tlug] Re: [RFC] Outline of the fast HTTP talk (PHP benchmark)

[Edward Middleton <emiddleton@example.com>]

Francois Cartegnie wrote:
> > I'm not clear what all this means. FastCGI from lighttpd does not issue
> > multiple simultaneous requests to an FCGI server, so one generally has
> > hundreds of FCGI servers runnning on a reasonably well loaded machine.
> > These processes certainly are preemptible, and while the individual
> > back-ends are FIFO, neither the group as a whole nor lighttpd is.
> >
> > I'm also not sure on what CPU affinity is being set; with this many
> > processes, one would think that the automatic CPU affinity would be
> > fine.
> >     
>
> There's the cpu affinity, which sets wich process runs on which cpu (the 
> dynamic you mention) but he uses the affinity tool function that changes the 
> process scheduler SCHED_FIFO (realtime) for the lighttpd process.

Are you confusing "-a 1" with  "-1" according to the manual[1] "-a 1" 
sets the process affinity to CPU0, and "-1" or  "-F" to SCHED_FIFO

Edward

1. http://linux.die.net/man/8/schedtool