Date: Thu, 07 Jul 2011 07:52:42 +0200 From: "Hartmann, O." <ohartman@zedat.fu-berlin.de> To: Oliver Pinter <oliver.pntr@gmail.com> Cc: FreeBSD Current <freebsd-current@freebsd.org>, Steve Kargl <sgk@troutmask.apl.washington.edu>, 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: <4E1549AA.4060404@zedat.fu-berlin.de> In-Reply-To: <CAPjTQNGg2jEJS4Kjx4ZNr6wSE_esSqEyAJaY2DJ3=JKee3=L%2Bg@mail.gmail.com> 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> <CAPjTQNGg2jEJS4Kjx4ZNr6wSE_esSqEyAJaY2DJ3=JKee3=L%2Bg@mail.gmail.com>
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On 07/06/11 23:49, Oliver Pinter wrote: > 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. >> _______________________________________________ >> freebsd-current@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-current >> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" >> > > http://lists.freebsd.org/pipermail/freebsd-stable/2010-September/thread.html#58537 The problem is not only related to desktop boxes, it involves servers with "big" hardware as well.
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