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Date: Wed, 6 Jul 2011 15:18:35 -0400
Message-ID: <CACqU3MVLr5VXRovs1uV+zHazJi2rrjE9Sp3XzsCPJ0Un06pmDQ@mail.gmail.com>
From: Arnaud Lacombe <lacombar@gmail.com>
To: Steve Kargl <sgk@troutmask.apl.washington.edu>
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Cc: FreeBSD Current <freebsd-current@freebsd.org>,
	"O. Hartmann" <ohartman@zedat.fu-berlin.de>,
	arrowdodger <6yearold@gmail.com>, freebsd-questions@freebsd.org
Subject: Re: Heavy I/O blocks FreeBSD box for several seconds
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Hi,

On Wed, Jul 6, 2011 at 12:28 PM, Steve Kargl
<sgk@troutmask.apl.washington.edu> wrote:
> On Wed, Jul 06, 2011 at 05:29:24PM +0200, O. Hartmann wrote:
>>
>> I use SCHED_ULE on all machines, since it is supposed to be performing
>> better on multicore boxes, but there are lots of suggestions switching
>> back to the old SCHED_4BSD scheduler.
>>
>
> If you are using MPI in numerical codes, then you want
> to use SCHED_4BSD. =A0I've posted numerous times about ULE
> and its very poor performance when using MPI.
>
> http://lists.freebsd.org/pipermail/freebsd-hackers/2008-October/026375.ht=
ml
>
[sarcasm]
It is rather funny to see that the post you point out has generated
exactly 0 meaningful follow-up then and as you mention later in this
thread, the issue still remains today :-)
[/sarcasm]

 - Arnaud