From owner-freebsd-current@FreeBSD.ORG Sun Dec 5 23:18:31 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 A8C1C1065679 for ; Sun, 5 Dec 2010 23:18:31 +0000 (UTC) (envelope-from sgk@troutmask.apl.washington.edu) Received: from troutmask.apl.washington.edu (troutmask.apl.washington.edu [128.208.78.105]) by mx1.freebsd.org (Postfix) with ESMTP id 8BE4E8FC18 for ; Sun, 5 Dec 2010 23:18:31 +0000 (UTC) Received: from troutmask.apl.washington.edu (localhost.apl.washington.edu [127.0.0.1]) by troutmask.apl.washington.edu (8.14.4/8.14.4) with ESMTP id oB5NIU3V068167 for ; Sun, 5 Dec 2010 15:18:30 -0800 (PST) (envelope-from sgk@troutmask.apl.washington.edu) Received: (from sgk@localhost) by troutmask.apl.washington.edu (8.14.4/8.14.4/Submit) id oB5NITJL068166 for freebsd-current@freebsd.org; Sun, 5 Dec 2010 15:18:29 -0800 (PST) (envelope-from sgk) Date: Sun, 5 Dec 2010 15:18:29 -0800 From: Steve Kargl To: freebsd-current@freebsd.org Message-ID: <20101205231829.GA68156@troutmask.apl.washington.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.3i Subject: 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: Sun, 05 Dec 2010 23:18:31 -0000 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 = 1.067100e-04 69.55 real 38.39 user 30.94 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 68.82 real 40.95 user 27.60 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 69.14 real 38.90 user 30.02 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 68.79 real 40.59 user 27.99 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 68.93 real 39.76 user 28.96 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 68.71 real 41.21 user 27.29 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 69.05 real 39.68 user 29.15 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 68.99 real 39.98 user 28.80 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 69.02 real 39.64 user 29.16 sys Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04 69.38 real 37.49 user 31.67 sys testf is a numerically intensive program that tests the accuracy of expf() in a tight loop. User 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. -- Steve