From: Ion Badulescu <ionut@moisil.cs.columbia.edu>
To: root@chaos.analogic.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: how to let all others run
Date: Thu, 5 Apr 2001 15:29:54 -0700 [thread overview]
Message-ID: <200104052229.f35MTse22138@moisil.dev.hydraweb.com> (raw)
In-Reply-To: <Pine.LNX.3.95.1010405124737.15946A-100000@chaos.analogic.com>
On Thu, 5 Apr 2001 12:52:28 -0400 (EDT), Richard B. Johnson <root@chaos.analogic.com> wrote:
> Only an observation:
>
>
> main()
> {
> nice(19);
> for(;;)
> sched_yield();
> }
>
> does...
>
[...]
>
> It consumes 99.1 percent CPU, just spinning.
And, umm, what *exactly* would you expect it to do? It's the only process
consuming cpu, and sched_yield() certainly doesn't yield to the idle
task. So it's basically the same as a "for(;;);" program, except it
spends more time in kernel space and schedules faster when something
else needs the cpu.
It's 100% expected behavior.
Ion
--
It is better to keep your mouth shut and be thought a fool,
than to open it and remove all doubt.
prev parent reply other threads:[~2001-04-05 22:31 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-02 14:05 how to let all others run Oliver Neukum
2001-04-04 20:11 ` John Fremlin
2001-04-04 21:00 ` Richard B. Johnson
2001-04-05 15:55 ` John Fremlin
2001-04-05 16:52 ` Richard B. Johnson
2001-04-05 20:41 ` Oliver.Neukum
2001-04-05 21:08 ` Richard B. Johnson
2001-04-05 22:29 ` Ion Badulescu [this message]
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