From owner-freebsd-questions@FreeBSD.ORG Wed Jul 6 22:13:21 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 94AD2106566B; Wed, 6 Jul 2011 22:13:21 +0000 (UTC) (envelope-from oliver.pntr@gmail.com) Received: from mail-wy0-f182.google.com (mail-wy0-f182.google.com [74.125.82.182]) by mx1.freebsd.org (Postfix) with ESMTP id 025EC8FC0A; Wed, 6 Jul 2011 22:13:20 +0000 (UTC) Received: by wyg24 with SMTP id 24so366252wyg.13 for ; Wed, 06 Jul 2011 15:13:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=XY+VmAoMpY+1O8UkR/S28RxGOdNlEaBvSuOhmPwartU=; b=E6YxG2RT4AUrKkuNacez7AoSbYlLsoXPnKJxUu3kzT8ZWM6IshlC+cL2qpUZu5um0K L+N6ctlmDJaERYT5Paj3kZyICk/s+u/zNDCEiu+BcVBubgv1WL3DN0XTnk1nOVHThP0f VHdTSPsCEdRuoAKCTOhcNn1mgRlzLQQy2iOnM= MIME-Version: 1.0 Received: by 10.227.32.76 with SMTP id b12mr61518wbd.45.1309988997612; Wed, 06 Jul 2011 14:49:57 -0700 (PDT) Received: by 10.227.209.209 with HTTP; Wed, 6 Jul 2011 14:49:57 -0700 (PDT) In-Reply-To: <4E14CCE5.4050906@zedat.fu-berlin.de> References: <4E1421D9.7080808@zedat.fu-berlin.de> <4E147F54.40908@zedat.fu-berlin.de> <20110706162811.GA68436@troutmask.apl.washington.edu> <20110706193636.GA69550@troutmask.apl.washington.edu> <4E14CCE5.4050906@zedat.fu-berlin.de> Date: Wed, 6 Jul 2011 23:49:57 +0200 Message-ID: From: Oliver Pinter To: "Hartmann, O." Content-Type: text/plain; charset=ISO-8859-1 X-Mailman-Approved-At: Wed, 06 Jul 2011 22:52:48 +0000 Cc: Arnaud Lacombe , FreeBSD Current , arrowdodger <6yearold@gmail.com>, Steve Kargl , 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 22:13:21 -0000 On 7/6/11, Hartmann, O. 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 >>> 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