Heavy I/O blocks FreeBSD box for several seconds

Oliver Pinter oliver.pntr at gmail.com
Wed Jul 6 22:13:21 UTC 2011

On 7/6/11, Hartmann, O. <ohartman at 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 at 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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