Date: Wed, 06 Jul 2011 23:00:21 +0200 From: "Hartmann, O." <ohartman@zedat.fu-berlin.de> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: FreeBSD Current <freebsd-current@freebsd.org>, arrowdodger <6yearold@gmail.com>, Arnaud Lacombe <lacombar@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Heavy I/O blocks FreeBSD box for several seconds Message-ID: <4E14CCE5.4050906@zedat.fu-berlin.de> In-Reply-To: <20110706193636.GA69550@troutmask.apl.washington.edu> 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>
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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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