From owner-freebsd-questions@FreeBSD.ORG Wed Jul 6 19:44:09 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 2B327106566B for ; Wed, 6 Jul 2011 19:44:09 +0000 (UTC) (envelope-from lacombar@gmail.com) Received: from mail-pz0-f54.google.com (mail-pz0-f54.google.com [209.85.210.54]) by mx1.freebsd.org (Postfix) with ESMTP id 01D2F8FC12 for ; Wed, 6 Jul 2011 19:44:08 +0000 (UTC) Received: by pzk27 with SMTP id 27so319486pzk.13 for ; Wed, 06 Jul 2011 12:44:08 -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:content-transfer-encoding; bh=+NLBUqwjXrBnZSYeoXGQdLtf3ZkYyKFEU/GVbuye4TY=; b=qPvT83nmcgyjM6Xnxf65YcjeHtvx0CG1GzGx2kmInwkBXniwxcmpTXPMHruHKgFYGn z1F7iXG1jMtQFUCtKwN0ZNCrryXY0s9+jz1kcdMCqu5t7NnN/RUfJAblpR6JLXRMzaW0 OlsFkh2IbEzb3zb059xkW3rRxAidSkLKyykuc= MIME-Version: 1.0 Received: by 10.68.15.67 with SMTP id v3mr3198321pbc.5.1309979915391; Wed, 06 Jul 2011 12:18:35 -0700 (PDT) Received: by 10.68.64.200 with HTTP; Wed, 6 Jul 2011 12:18:35 -0700 (PDT) In-Reply-To: <20110706162811.GA68436@troutmask.apl.washington.edu> References: <4E1421D9.7080808@zedat.fu-berlin.de> <4E147F54.40908@zedat.fu-berlin.de> <20110706162811.GA68436@troutmask.apl.washington.edu> Date: Wed, 6 Jul 2011 15:18:35 -0400 Message-ID: From: Arnaud Lacombe To: Steve Kargl Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: FreeBSD Current , "O. Hartmann" , 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 19:44:09 -0000 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. =A0I've posted numerous times about ULE > and its very poor performance when using MPI. > > http://lists.freebsd.org/pipermail/freebsd-hackers/2008-October/026375.ht= ml > [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] - Arnaud