Date: Wed, 6 Jul 2011 09:28:11 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: "O. Hartmann" <ohartman@zedat.fu-berlin.de> Cc: FreeBSD Current <freebsd-current@freebsd.org>, arrowdodger <6yearold@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Heavy I/O blocks FreeBSD box for several seconds Message-ID: <20110706162811.GA68436@troutmask.apl.washington.edu> In-Reply-To: <4E147F54.40908@zedat.fu-berlin.de> References: <4E1421D9.7080808@zedat.fu-berlin.de> <CALH631=F4bSgNDE4w0qcXGMgGxZRRwCP9n-H4M0c%2B1UEaqWr7Q@mail.gmail.com> <4E147F54.40908@zedat.fu-berlin.de>
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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 -- Steve
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