From owner-freebsd-questions@FreeBSD.ORG Wed Jul 6 16:38:27 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F3A421065679; Wed, 6 Jul 2011 16:38:26 +0000 (UTC) (envelope-from ohartman@zedat.fu-berlin.de) Received: from outpost1.zedat.fu-berlin.de (outpost1.zedat.fu-berlin.de [130.133.4.66]) by mx1.freebsd.org (Postfix) with ESMTP id AD7368FC1F; Wed, 6 Jul 2011 16:38:26 +0000 (UTC) Received: from inpost2.zedat.fu-berlin.de ([130.133.4.69]) by outpost1.zedat.fu-berlin.de (Exim 4.69) with esmtp (envelope-from ) id <1QeV7J-00017N-Cf>; Wed, 06 Jul 2011 18:38:25 +0200 Received: from e178039240.adsl.alicedsl.de ([85.178.39.240] helo=thor.walstatt.dyndns.org) by inpost2.zedat.fu-berlin.de (Exim 4.69) with esmtpsa (envelope-from ) id <1QeV7J-0003jY-8v>; Wed, 06 Jul 2011 18:38:25 +0200 Message-ID: <4E148F7F.5020209@zedat.fu-berlin.de> Date: Wed, 06 Jul 2011 18:38:23 +0200 From: "Hartmann, O." User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:5.0) Gecko/20110630 Thunderbird/5.0 MIME-Version: 1.0 To: Steve Kargl References: <4E1421D9.7080808@zedat.fu-berlin.de> <4E147F54.40908@zedat.fu-berlin.de> <20110706162811.GA68436@troutmask.apl.washington.edu> In-Reply-To: <20110706162811.GA68436@troutmask.apl.washington.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: 85.178.39.240 Cc: FreeBSD Current , arrowdodger <6yearold@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Heavy I/O blocks FreeBSD box for several seconds X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Jul 2011 16:38:27 -0000 On 07/06/11 18:28, Steve Kargl 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 > Worth a try, but most of my code I use is OpenMP, not MPI. The post is of 2008, that's three years ago and 9.0 is on the brink to become released ...