From: "Chris Friesen" <cfriesen@nortel.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Dmitry Adamushko <dmitry.adamushko@gmail.com>,
Peter Williams <pwil3058@bigpond.net.au>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch] CFS scheduler, -v12
Date: Tue, 22 May 2007 10:48:54 -0600 [thread overview]
Message-ID: <46531EF6.3020204@nortel.com> (raw)
In-Reply-To: <20070521085703.GA18755@elte.hu>
Ingo Molnar wrote:
> CFS is fair even on SMP. Consider for example the worst-case
> 3-tasks-on-2-CPUs workload on a 2-CPU box:
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 2658 mingo 20 0 1580 248 200 R 67 0.0 0:56.30 loop
> 2656 mingo 20 0 1580 252 200 R 66 0.0 0:55.55 loop
> 2657 mingo 20 0 1576 248 200 R 66 0.0 0:55.24 loop
>
> 66% of CPU time for each task. The 'TIME+' column shows a 2% spread
> between the slowest and the fastest loop after just 1 minute of runtime
> (and the spread gets narrower with time).
Is there a way in CFS to tune the amount of time over which the load
balancer is fair? (Of course there would be some overhead involved.)
Chris
next prev parent reply other threads:[~2007-05-22 16:49 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-13 15:38 [patch] CFS scheduler, -v12 Ingo Molnar
2007-05-16 2:04 ` Peter Williams
2007-05-16 8:08 ` Ingo Molnar
2007-05-16 23:42 ` Peter Williams
[not found] ` <20070516063625.GA9058@elte.hu>
2007-05-17 23:45 ` Peter Williams
[not found] ` <20070518071325.GB28702@elte.hu>
2007-05-18 13:11 ` Peter Williams
2007-05-18 13:26 ` Peter Williams
2007-05-19 13:27 ` Dmitry Adamushko
2007-05-20 1:41 ` Peter Williams
2007-05-21 8:29 ` William Lee Irwin III
2007-05-21 8:57 ` Ingo Molnar
2007-05-21 12:08 ` William Lee Irwin III
2007-05-22 16:48 ` Chris Friesen [this message]
2007-05-22 20:15 ` Ingo Molnar
2007-05-22 20:49 ` Chris Friesen
2007-05-21 15:25 ` Dmitry Adamushko
2007-05-21 23:51 ` Peter Williams
2007-05-22 4:47 ` Peter Williams
2007-05-22 12:03 ` Peter Williams
2007-05-24 7:43 ` Peter Williams
2007-05-24 16:45 ` Siddha, Suresh B
2007-05-24 23:23 ` Peter Williams
2007-05-29 20:45 ` Siddha, Suresh B
2007-05-29 23:54 ` Peter Williams
2007-05-30 0:50 ` Siddha, Suresh B
2007-05-30 2:18 ` Peter Williams
2007-05-30 4:42 ` Siddha, Suresh B
2007-05-30 6:28 ` Peter Williams
2007-05-31 1:49 ` Peter Williams
2007-05-22 11:52 ` Dmitry Adamushko
2007-05-23 0:10 ` Peter Williams
2007-05-18 0:18 ` Bill Huey
2007-05-18 1:01 ` Bill Huey
2007-05-18 4:13 ` William Lee Irwin III
2007-05-18 7:31 ` Ingo Molnar
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