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Date:      Wed, 6 Jul 2011 23:49:57 +0200
From:      Oliver Pinter <oliver.pntr@gmail.com>
To:        "Hartmann, O." <ohartman@zedat.fu-berlin.de>
Cc:        Arnaud Lacombe <lacombar@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org>, arrowdodger <6yearold@gmail.com>, Steve Kargl <sgk@troutmask.apl.washington.edu>, freebsd-questions@freebsd.org
Subject:   Re: Heavy I/O blocks FreeBSD box for several seconds
Message-ID:  <CAPjTQNGg2jEJS4Kjx4ZNr6wSE_esSqEyAJaY2DJ3=JKee3=L%2Bg@mail.gmail.com>
In-Reply-To: <4E14CCE5.4050906@zedat.fu-berlin.de>
References:  <4E1421D9.7080808@zedat.fu-berlin.de> <CALH631=F4bSgNDE4w0qcXGMgGxZRRwCP9n-H4M0c%2B1UEaqWr7Q@mail.gmail.com> <4E147F54.40908@zedat.fu-berlin.de> <20110706162811.GA68436@troutmask.apl.washington.edu> <CACqU3MVLr5VXRovs1uV%2BzHazJi2rrjE9Sp3XzsCPJ0Un06pmDQ@mail.gmail.com> <20110706193636.GA69550@troutmask.apl.washington.edu> <4E14CCE5.4050906@zedat.fu-berlin.de>

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On 7/6/11, Hartmann, O. <ohartman@zedat.fu-berlin.de> wrote:
> On 07/06/11 21:36, Steve Kargl wrote:
>> On Wed, Jul 06, 2011 at 03:18:35PM -0400, Arnaud Lacombe wrote:
>>> 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. ?I've posted numerous times about ULE
>>>> and its very poor performance when using MPI.
>>>>
>>>> http://lists.freebsd.org/pipermail/freebsd-hackers/2008-October/026375.html
>>>>
>>> [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]
>>>
>> Apparently, you are privy to my private email exchanges
>> with jeffr.
>>
>> I'm also not sure why you're being sarcastic here.  The
>> issue was and AFAIK still is a problem for anyone using
>> FreeBSD in a HPC cluster.  ULE simply performs worse than
>> 4BSD.
>>
> Well, I know only very little people using FreeBSD within a HPC cluster
> or even for scientific purposes, except myself and some people around here.
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http://lists.freebsd.org/pipermail/freebsd-stable/2010-September/thread.html#58537



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