From owner-freebsd-current@FreeBSD.ORG Mon Dec 6 06:19:14 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 434E6106566B; Mon, 6 Dec 2010 06:19:14 +0000 (UTC) (envelope-from yanegomi@gmail.com) Received: from mail-ww0-f50.google.com (mail-ww0-f50.google.com [74.125.82.50]) by mx1.freebsd.org (Postfix) with ESMTP id 9FA588FC15; Mon, 6 Dec 2010 06:19:13 +0000 (UTC) Received: by wwf26 with SMTP id 26so7486648wwf.31 for ; Sun, 05 Dec 2010 22:19:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:cc:content-type:content-transfer-encoding; bh=QyvzREL/NO9Th1BugKaqU07Dgnfa14p3tO4eWQrKWYM=; b=u24fUjgzILJG+tGIal53eed0W3b1OC6G4b1txPOSinFzNmtFv8aJ+4s9j0o6Q1FBaJ l7K1BqKnVp6mSMSuQGElTATajWO2VYYwFOuwuyzThGD0IP4vjqQGuEhXKJzfMmA8efUi kxhjDlq1JvG9TEOyJHYipE3P9CfXqhuiZmNsU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=WpxE9uGtHv77Weq5jV3X2UCi9nKLxxufBqRIVwcsgcUMZvwLK4NrW2dwQzl+ztOPeV sofO+f+1cb6t8WVK6l7gU+Hs4VFIplaqlVRxIAaG9q6jB/HPP2mmmHKBaGaBW0izC/Gg wPBnoXR9A74BSe4xjK1V5kqnGbx+QuyB6smwI= MIME-Version: 1.0 Received: by 10.216.168.136 with SMTP id k8mr1255904wel.45.1291616352560; Sun, 05 Dec 2010 22:19:12 -0800 (PST) Sender: yanegomi@gmail.com Received: by 10.216.198.27 with HTTP; Sun, 5 Dec 2010 22:19:12 -0800 (PST) In-Reply-To: <20101206061230.GA69477@troutmask.apl.washington.edu> References: <20101205231829.GA68156@troutmask.apl.washington.edu> <4CFC27A0.8000406@freebsd.org> <20101206061230.GA69477@troutmask.apl.washington.edu> Date: Sun, 5 Dec 2010 22:19:12 -0800 X-Google-Sender-Auth: lCDhp5_cIZP0Sr-20T1Y6T9bfvI Message-ID: From: Garrett Cooper To: Steve Kargl Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-current@freebsd.org Subject: Re: Process accounting/timing has broken recently X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Dec 2010 06:19:14 -0000 On Sun, Dec 5, 2010 at 10:12 PM, Steve Kargl wrote: > On Sun, Dec 05, 2010 at 04:00:32PM -0800, Julian Elischer wrote: >> On 12/5/10 3:18 PM, Steve Kargl wrote: >> >Sometime in the last 7-10 days, some one made a >> >change that has broken process accounting/timing. >> > >> >laptop:kargl[42] foreach i ( 0 1 2 3 4 5 6 7 8 9 ) >> >foreach? time ./testf >> >foreach? end >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A069.55 real =A0 =A0 =A0 =A038.39 user =A0 =A0 =A0 =A030.= 94 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A068.82 real =A0 =A0 =A0 =A040.95 user =A0 =A0 =A0 =A027.= 60 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A069.14 real =A0 =A0 =A0 =A038.90 user =A0 =A0 =A0 =A030.= 02 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A068.79 real =A0 =A0 =A0 =A040.59 user =A0 =A0 =A0 =A027.= 99 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A068.93 real =A0 =A0 =A0 =A039.76 user =A0 =A0 =A0 =A028.= 96 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A068.71 real =A0 =A0 =A0 =A041.21 user =A0 =A0 =A0 =A027.= 29 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A069.05 real =A0 =A0 =A0 =A039.68 user =A0 =A0 =A0 =A029.= 15 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A068.99 real =A0 =A0 =A0 =A039.98 user =A0 =A0 =A0 =A028.= 80 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A069.02 real =A0 =A0 =A0 =A039.64 user =A0 =A0 =A0 =A029.= 16 sys >> >Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx =3D 1.067100e= -04 >> > =A0 =A0 =A0 =A069.38 real =A0 =A0 =A0 =A037.49 user =A0 =A0 =A0 =A031.= 67 sys >> > >> >testf is a numerically intensive program that tests the >> >accuracy of expf() in a tight loop. =A0User time varies >> >by ~3 seconds on my lightly loaded 2 GHz core2 duo processor. >> >I'm fairly certain that the code does not suddenly grow/loose >> >6 GFLOP of operations. >> > >> I know it's a lot to ask but it may be something that you can help >> with if you >> had the time to triangulate in on the change that did it.. >> I presume that since you are an "old hand" you can check out sources >> at different revisions.. > > I was hoping that someone (possibly the person responsible) would > recognize the symptoms and recommend a revision or two to revert. > Otherwise, doing a binary search will take some time in that it > takes 4+ hours for a buildworld/kernel cycle on my laptop. If you can provide the source for the application you're running above and instructions on how to compile it, I can at least give you a bit of a head start :). Thanks, -Garrett