Date: Mon, 19 Mar 2001 20:58:54 +0100 From: Thierry Herbelot <thierry@herbelot.com> To: Alfred Perlstein <bright@wintelcom.net> Cc: hackers@FreeBSD.ORG Subject: Re: scheduling frequency for threaded applications ? Message-ID: <3AB664FE.32CD18CD@herbelot.com> References: <3AB66167.7DE93AB2@herbelot.com> <20010319114625.Z29888@fw.wintelcom.net>
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Alfred Perlstein wrote:
>
> * Thierry Herbelot <thierry@herbelot.com> [010319 11:43] wrote:
> > Hello,
> >
> > I'm developping a network benchmark application ("packet blaster").
> >
> > The current version uses many processes, to send and receive packets,
> > and collate statistics.
> > when I look at top(1), I see most of the time taken is in the "system"
> > category. I assume this is due to the many context switches between the
> > collaborating processes.
>
> You're incorrect. System means just about any time spent inside the
> kernel (except interrupts), so basically syscalls count towards this
> meaning that your application is driving the kernel pretty hard.
>
> This is easy for a team of processes, but nearly impossible with
> a thread based approach.
could you please elaborate ? (indeed, if you could also shed some light
on the first question : how frequently are threads rescheduled ?)
>
> You don't want to use threads.
>
> --
> -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
PS : the TI-RPC commit was a nice one !
--
Thierry Herbelot
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