From unknown Mon Jun 23 23:49:31 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#6600 <6600@debbugs.gnu.org> To: bug#6600 <6600@debbugs.gnu.org> Subject: Status: [PATCH] sort: add --threads option to parallelize internal sort. Reply-To: bug#6600 <6600@debbugs.gnu.org> Date: Tue, 24 Jun 2025 06:49:31 +0000 retitle 6600 [PATCH] sort: add --threads option to parallelize internal sor= t. reassign 6600 coreutils submitter 6600 P=C3=A1draig Brady severity 6600 normal tag 6600 patch thanks From debbugs-submit-bounces@debbugs.gnu.org Fri Jul 09 21:08:46 2010 Received: (at submit) by debbugs.gnu.org; 10 Jul 2010 01:08:46 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXOYf-0000iR-AP for submit@debbugs.gnu.org; Fri, 09 Jul 2010 21:08:45 -0400 Received: from mx10.gnu.org ([199.232.76.166]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXOYc-0000iK-TE for submit@debbugs.gnu.org; Fri, 09 Jul 2010 21:08:43 -0400 Received: from lists.gnu.org ([199.232.76.165]:49413) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1OXOYZ-0003lg-0E for submit@debbugs.gnu.org; Fri, 09 Jul 2010 21:08:39 -0400 Received: from [140.186.70.92] (port=57143 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OXOYX-0000Wc-Hi for bug-coreutils@gnu.org; Fri, 09 Jul 2010 21:08:38 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable version=3.3.1 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OXOYW-0003qp-5r for bug-coreutils@gnu.org; Fri, 09 Jul 2010 21:08:37 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]:1061) by eggs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1OXOYV-0003qL-SU for bug-coreutils@gnu.org; Fri, 09 Jul 2010 21:08:36 -0400 Received: (qmail 45007 invoked from network); 10 Jul 2010 01:08:33 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 10 Jul 2010 01:08:33 -0000 Message-ID: <4C37C7D9.2030909@draigBrady.com> Date: Sat, 10 Jul 2010 02:07:37 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: Chen Guo Subject: Re: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> In-Reply-To: <535984.88146.qm@web180006.mail.gq1.yahoo.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: FreeBSD 4.6-4.9 X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-Spam-Score: -3.5 (---) X-Debbugs-Envelope-To: submit Cc: Paul Eggert , Bug Coreutils , Glen Lenker , Mike Nichols , Gene Auyeung , Chris Dickens X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -4.8 (----) On 08/03/10 10:39, Chen Guo wrote: > Hi Padraig, > >> You previously mentioned a thread bug with memcoll. Is that worked around? > > That happened when more than one instance of memcoll is called on the same > line at once, since memcoll replaces the eolchar with '\0'. Under our approach, > the same line shouldn't ever be compared at the same time, so we're fine. > On top of that, Professor Eggert suggested NUL delimiting all lines as they're > read in, so memcoll doesn't have to; hence the patch to gnulib, which introduces > xmemcoll_nul and memcoll_nul, for when input is known to be NUL delimited, thus > no replacement of the eolchar is needed, making memcoll threadsafe. Note the current xmemcoll0() in gnulib requires the length _including_ the terminating NUL to be passed, whereas one usually does not include the terminating char in the length passed to xmemcoll(). I accordingly updated the lengths passed to xmemcoll0() by your latest patch. However there are still writes done to the source text in the keycompare() function. So I'm thinking of dropping the whole xmemcoll0() thing altogether assuming your statement above is correct, that a particular line will not be used at the same time by multiple threads. I did try to copy the text to the stack before comparing, but that introduced a significant overhead noted below. Your patch is still performing well on a single core machine: ----------- before --------------------- $ time ./src/sort < nums.list >/dev/null real 0m8.644s user 0m8.307s sys 0m0.292s $ time ./src/sort -g < nums.list >/dev/null real 0m11.046s user 0m10.652s sys 0m0.295s $ time ./src/sort -n < nums.list >/dev/null real 0m4.909s user 0m4.567s sys 0m0.298s $ time LANG=C ./src/sort < nums.list >/dev/null real 0m1.959s user 0m1.657s sys 0m0.285s ------------ after --------------------- $ time ./src/sort < nums.list >/dev/null real 0m8.686s user 0m8.300s sys 0m0.232s $ time ./src/sort -g < nums.list >/dev/null real 0m10.196s user 0m9.850s sys 0m0.221s $ time ./src/sort -n < nums.list >/dev/null real 0m2.958s user 0m2.664s sys 0m0.221s $ time LANG=C ./src/sort < nums.list >/dev/null real 0m1.985s user 0m1.750s sys 0m0.217s After copying the text to the stack as mentioned above there is a significant performance drop: $ time ./src/sort -n < nums.list >/dev/null real 0m4.086s user 0m3.848s sys 0m0.218s cheers, Pádraig. From debbugs-submit-bounces@debbugs.gnu.org Fri Jul 09 22:54:44 2010 Received: (at submit) by debbugs.gnu.org; 10 Jul 2010 02:54:44 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXQDD-0001OL-NQ for submit@debbugs.gnu.org; Fri, 09 Jul 2010 22:54:44 -0400 Received: from mail.gnu.org ([199.232.76.166] helo=mx10.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXQDB-0001OG-3d for submit@debbugs.gnu.org; Fri, 09 Jul 2010 22:54:41 -0400 Received: from lists.gnu.org ([199.232.76.165]:39317) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1OXQD7-0004nO-Lo for submit@debbugs.gnu.org; Fri, 09 Jul 2010 22:54:37 -0400 Received: from [140.186.70.92] (port=55389 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OXQD6-000704-8o for bug-coreutils@gnu.org; Fri, 09 Jul 2010 22:54:37 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_RP_MATCHES_RCVD autolearn=unavailable version=3.3.1 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OXQD5-0005WR-4Z for bug-coreutils@gnu.org; Fri, 09 Jul 2010 22:54:36 -0400 Received: from kiwi.cs.ucla.edu ([131.179.128.19]:52653) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXQD4-0005W5-PV for bug-coreutils@gnu.org; Fri, 09 Jul 2010 22:54:35 -0400 Received: from [131.179.64.200] (Penguin.CS.UCLA.EDU [131.179.64.200]) by kiwi.cs.ucla.edu (8.13.8+Sun/8.13.8/UCLACS-6.0) with ESMTP id o6A2sQoF002843; Fri, 9 Jul 2010 19:54:27 -0700 (PDT) Message-ID: <4C37E0E2.3060205@cs.ucla.edu> Date: Fri, 09 Jul 2010 19:54:26 -0700 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.10) Gecko/20100527 Thunderbird/3.0.5 MIME-Version: 1.0 To: =?ISO-8859-1?Q?P=E1draig_Brady?= Subject: Re: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> In-Reply-To: <4C37C7D9.2030909@draigBrady.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by kiwi.cs.ucla.edu id o6A2sQoF002843 X-detected-operating-system: by eggs.gnu.org: Solaris 10 (beta) X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-Spam-Score: -4.8 (----) X-Debbugs-Envelope-To: submit Cc: Bug Coreutils , Chen Guo , Glen Lenker , Mike Nichols , Gene Auyeung , Chris Dickens X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -4.8 (----) On 07/09/10 18:07, P=E1draig Brady wrote: > Chen Guo wrote: >> That happened when more than one instance of memcoll is called on the = same >> line at once, since memcoll replaces the eolchar with '\0'. Under our = approach, >> the same line shouldn't ever be compared at the same time, so we're fi= ne. Ah, sorry, I wasn't aware of that. > I'm thinking of dropping > the whole xmemcoll0() thing altogether assuming your > statement above is correct, that a particular line will > not be used at the same time by multiple threads. Yes, that makes sense. We can revert that change from gnulib, since it makes gnulib bigger unnecessarily. From debbugs-submit-bounces@debbugs.gnu.org Sat Jul 10 05:30:16 2010 Received: (at submit) by debbugs.gnu.org; 10 Jul 2010 09:30:16 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXWO0-0003vH-Il for submit@debbugs.gnu.org; Sat, 10 Jul 2010 05:30:16 -0400 Received: from mail.gnu.org ([199.232.76.166] helo=mx10.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXWNx-0003vC-7J for submit@debbugs.gnu.org; Sat, 10 Jul 2010 05:30:14 -0400 Received: from lists.gnu.org ([199.232.76.165]:47815) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1OXWNt-00010x-AB for submit@debbugs.gnu.org; Sat, 10 Jul 2010 05:30:09 -0400 Received: from [140.186.70.92] (port=53408 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OXWNp-00032U-LJ for bug-coreutils@gnu.org; Sat, 10 Jul 2010 05:30:07 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable version=3.3.1 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OXWNn-00053f-UJ for bug-coreutils@gnu.org; Sat, 10 Jul 2010 05:30:05 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]:13450) by eggs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1OXWNn-00053F-LS for bug-coreutils@gnu.org; Sat, 10 Jul 2010 05:30:03 -0400 Received: (qmail 96387 invoked from network); 10 Jul 2010 09:30:01 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 10 Jul 2010 09:30:01 -0000 Message-ID: <4C383D5F.4090703@draigBrady.com> Date: Sat, 10 Jul 2010 10:29:03 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: Chen Guo Subject: Re: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> In-Reply-To: X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: FreeBSD 4.6-4.9 X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-Spam-Score: -4.8 (----) X-Debbugs-Envelope-To: submit Cc: Paul Eggert , Bug Coreutils , Glen Lenker , Mike Nichols , Gene Auyeung , Chris Dickens X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -4.8 (----) On 10/07/10 05:23, Chen Guo wrote: > 2010/7/9 Paul Eggert : >> On 07/09/10 18:07, Pádraig Brady wrote: >>> Chen Guo wrote: >>>> That happened when more than one instance of memcoll is called on the same >>>> line at once, since memcoll replaces the eolchar with '\0'. Under our approach, >>>> the same line shouldn't ever be compared at the same time, so we're fine. >> >> Ah, sorry, I wasn't aware of that. >> >>> I'm thinking of dropping >>> the whole xmemcoll0() thing altogether assuming your >>> statement above is correct, that a particular line will >>> not be used at the same time by multiple threads. >> >> Yes, that makes sense. We can revert that change from gnulib, since it >> makes gnulib bigger unnecessarily. >> > > Actually, the '\0' saves about 5% off runtime last I checked. This is because > EACH TIME sort compares two lines memcoll would replace the last byte. If we > set them all to NUL anyway at the start, memcoll_nul wouldn't need to do that > replacement for each compare. When we output, we'd simply put the \n back. > > I could be wrong though, this is going off memory from 4-5 months ago. But 5% > is about what I remember, when sorting 1M lines on 8 cores. Well for the whole line comparison where it works it's 2.9% faster (or 2.3% adding in the NUL checks to xmemcoll0). Also xmemcoll0() is probably generally useful since it's a readonly function. So I'll leave it and fix up the keycompare() calls to it (while documenting that keycompare() needs to work on a particular line in line one thread. thanks, Pádraig. From debbugs-submit-bounces@debbugs.gnu.org Sat Jul 10 12:29:03 2010 Received: (at submit) by debbugs.gnu.org; 10 Jul 2010 16:29:04 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXcvH-0007VL-0o for submit@debbugs.gnu.org; Sat, 10 Jul 2010 12:29:03 -0400 Received: from mx10.gnu.org ([199.232.76.166]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXRbW-0001vV-OS for submit@debbugs.gnu.org; Sat, 10 Jul 2010 00:23:55 -0400 Received: from lists.gnu.org ([199.232.76.165]:39306) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1OXRbT-0005gB-8u for submit@debbugs.gnu.org; Sat, 10 Jul 2010 00:23:51 -0400 Received: from [140.186.70.92] (port=52869 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OXRbR-0001Zb-DY for bug-coreutils@gnu.org; Sat, 10 Jul 2010 00:23:50 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, T_DKIM_INVALID autolearn=no version=3.3.1 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OXRbQ-0005sK-3s for bug-coreutils@gnu.org; Sat, 10 Jul 2010 00:23:49 -0400 Received: from mail-pv0-f169.google.com ([74.125.83.169]:33082) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OXRbP-0005sG-T2 for bug-coreutils@gnu.org; Sat, 10 Jul 2010 00:23:48 -0400 Received: by pvc30 with SMTP id 30so2510326pvc.0 for ; Fri, 09 Jul 2010 21:23:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=AocMZLpSpYOpiyP9DgmzJn42whcvPIoDCOSGecskCMI=; b=grt7ovdCLMC3bnsyh6O6/GfoWXmrM4qoIwj+yrRITjp6kPmUEcm2Vl+kxL/hu5zOC9 b0rERZ9QOhTrXBq40ktf/jX672mvaeFq8X060xmtNrqGhAQyEmKHu1vlfXVUlLB123L7 NjS4t4PO3CrsSAskN2H+1oEJgZsDVihmxUtlI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=HRMEZg+CctXiLfjn8GciyoqJbgZmzLCveTdTc9khskP0WfuLK/MBs9B9LexpoaHsLY G11OIz+qNnx2KD7njpkO62w5TI3UQod5qNQb7WUoFkXwDsDDRqH4B5PhC6XdAJ2D4gzP 12LBOBo2WVS0Mv9m1c8QvoFMtr7f/qVULpV4k= MIME-Version: 1.0 Received: by 10.142.170.2 with SMTP id s2mr12850973wfe.243.1278735826309; Fri, 09 Jul 2010 21:23:46 -0700 (PDT) Received: by 10.142.192.12 with HTTP; Fri, 9 Jul 2010 21:23:46 -0700 (PDT) In-Reply-To: <4C37E0E2.3060205@cs.ucla.edu> References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> Date: Fri, 9 Jul 2010 21:23:46 -0700 Message-ID: Subject: Re: [PATCH] sort: add --threads option to parallelize internal sort. From: Chen Guo To: Paul Eggert Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-Spam-Score: -5.9 (-----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Sat, 10 Jul 2010 12:29:01 -0400 Cc: Bug Coreutils , Glen Lenker , Mike Nichols , Gene Auyeung , Chris Dickens , =?ISO-8859-1?Q?P=E1draig_Brady?= X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -5.9 (-----) 2010/7/9 Paul Eggert : > On 07/09/10 18:07, P=E1draig Brady wrote: >> Chen Guo wrote: >>> That happened when more than one instance of memcoll is called on the s= ame >>> line at once, since memcoll replaces the eolchar with '\0'. Under our a= pproach, >>> the same line shouldn't ever be compared at the same time, so we're fin= e. > > Ah, sorry, I wasn't aware of that. > >> I'm thinking of dropping >> the whole xmemcoll0() thing altogether assuming your >> statement above is correct, that a particular line will >> not be used at the same time by multiple threads. > > Yes, that makes sense. =A0We can revert that change from gnulib, since it > makes gnulib bigger unnecessarily. > Actually, the '\0' saves about 5% off runtime last I checked. This is becau= se EACH TIME sort compares two lines memcoll would replace the last byte. If w= e set them all to NUL anyway at the start, memcoll_nul wouldn't need to do th= at replacement for each compare. When we output, we'd simply put the \n back. I could be wrong though, this is going off memory from 4-5 months ago. But = 5% is about what I remember, when sorting 1M lines on 8 cores. From debbugs-submit-bounces@debbugs.gnu.org Mon Jul 12 21:00:22 2010 Received: (at 6600-done) by debbugs.gnu.org; 13 Jul 2010 01:00:22 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYTrC-00058O-7I for submit@debbugs.gnu.org; Mon, 12 Jul 2010 21:00:22 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1OYTr9-00058J-MX for 6600-done@debbugs.gnu.org; Mon, 12 Jul 2010 21:00:20 -0400 Received: (qmail 15223 invoked from network); 13 Jul 2010 01:00:22 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 13 Jul 2010 01:00:22 -0000 Message-ID: <4C3BBA60.9020201@draigBrady.com> Date: Tue, 13 Jul 2010 01:59:12 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: 6600-done@debbugs.gnu.org Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> In-Reply-To: <4C383D5F.4090703@draigBrady.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.8 (--) X-Debbugs-Envelope-To: 6600-done Cc: Paul Eggert , Chen Guo , Glen Lenker , Mike Nichols , Gene Auyeung , Chris Dickens X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.8 (--) I've finally applied the patch. http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=commit;h=9face836 I made a few comment tweaks and added some dependencies for the heap module. I also removed the xmemcoll0() calls which are separate to this concurrent functionality. I will add those back in Chen's name after updating to the latest gnulib. Thanks everyone for their work on this! Pádraig. From debbugs-submit-bounces@debbugs.gnu.org Tue Jul 13 05:14:52 2010 Received: (at 6600) by debbugs.gnu.org; 13 Jul 2010 09:14:52 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYbZj-0008O9-UR for submit@debbugs.gnu.org; Tue, 13 Jul 2010 05:14:52 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1OYbZh-0008O4-05 for 6600@debbugs.gnu.org; Tue, 13 Jul 2010 05:14:50 -0400 Received: (qmail 78612 invoked from network); 13 Jul 2010 09:14:53 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 13 Jul 2010 09:14:53 -0000 Message-ID: <4C3C2E44.9050009@draigBrady.com> Date: Tue, 13 Jul 2010 10:13:40 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: 6600@debbugs.gnu.org Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> In-Reply-To: <4C3BBA60.9020201@draigBrady.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.8 (--) X-Debbugs-Envelope-To: 6600 Cc: Gene Auyeung , Paul Eggert , Chen Guo X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.8 (--) Here's a small cleanup I missed. Alternatively one could make heap() return NULL rather than aborting, but since it already used xmalloc, I'm tending to this.. commit cec33eb226df63f406f7eb70cd46d960ee02a060 Author: Pádraig Brady Date: Tue Jul 13 08:23:52 2010 +0100 maint: heap.c: simplify heap_alloc * gl/lib/heap.c (heap_alloc): Use the fact that the xalloc routines will not return NULL. Also remove the redundant temporary variables. diff --git a/gl/lib/heap.c b/gl/lib/heap.c index a37224f..f148434 100644 --- a/gl/lib/heap.c +++ b/gl/lib/heap.c @@ -36,22 +36,12 @@ static void heapify_up (void **, size_t, struct heap * heap_alloc (int (*compare)(const void *, const void *), size_t n_reserve) { - struct heap *heap; - void *xmalloc_ret = xmalloc (sizeof *heap); - heap = (struct heap *) xmalloc_ret; - if (!heap) - return NULL; + struct heap *heap = xmalloc (sizeof *heap); - if (n_reserve <= 0) + if (n_reserve == 0) n_reserve = 1; - xmalloc_ret = xmalloc (n_reserve * sizeof *(heap->array)); - heap->array = (void **) xmalloc_ret; - if (!heap->array) - { - free (heap); - return NULL; - } + heap->array = xmalloc (n_reserve * sizeof *(heap->array)); heap->array[0] = NULL; heap->capacity = n_reserve; @@ -84,8 +74,7 @@ heap_insert (struct heap *heap, void *item) if (heap->capacity - 1 <= heap->count) { size_t new_size = (2 + heap->count) * sizeof *(heap->array); - void *realloc_ret = xrealloc (heap->array, new_size); - heap->array = (void **) realloc_ret; + heap->array = xrealloc (heap->array, new_size); From debbugs-submit-bounces@debbugs.gnu.org Tue Jul 13 10:35:29 2010 Received: (at 6600) by debbugs.gnu.org; 13 Jul 2010 14:35:29 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYga0-0002qv-QY for submit@debbugs.gnu.org; Tue, 13 Jul 2010 10:35:29 -0400 Received: from smtp1-g21.free.fr ([212.27.42.1]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYgZy-0002ql-6V for 6600@debbugs.gnu.org; Tue, 13 Jul 2010 10:35:27 -0400 Received: from mx.meyering.net (unknown [82.230.74.64]) by smtp1-g21.free.fr (Postfix) with ESMTP id 5D78A94012A; Tue, 13 Jul 2010 16:35:26 +0200 (CEST) Received: by rho.meyering.net (Acme Bit-Twister, from userid 1000) id E677EDEBA; Tue, 13 Jul 2010 16:35:24 +0200 (CEST) From: Jim Meyering To: =?utf-8?Q?P=C3=A1draig?= Brady Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. In-Reply-To: <4C3C2E44.9050009@draigBrady.com> (=?utf-8?Q?=22P=C3=A1draig?= Brady"'s message of "Tue, 13 Jul 2010 10:13:40 +0100") References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3C2E44.9050009@draigBrady.com> Date: Tue, 13 Jul 2010 16:35:24 +0200 Message-ID: <87hbk34fgz.fsf@meyering.net> Lines: 83 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -3.3 (---) X-Debbugs-Envelope-To: 6600 Cc: Gene Auyeung , 6600@debbugs.gnu.org, Paul Eggert , Chen Guo X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -3.3 (---) P=C3=A1draig Brady wrote: > Here's a small cleanup I missed. > Alternatively one could make heap() return NULL rather than aborting, > but since it already used xmalloc, I'm tending to this.. > > commit cec33eb226df63f406f7eb70cd46d960ee02a060 > Author: P=C3=A1draig Brady > Date: Tue Jul 13 08:23:52 2010 +0100 > > maint: heap.c: simplify heap_alloc > > * gl/lib/heap.c (heap_alloc): Use the fact that the xalloc > routines will not return NULL. Also remove the redundant > temporary variables. > > diff --git a/gl/lib/heap.c b/gl/lib/heap.c > index a37224f..f148434 100644 > --- a/gl/lib/heap.c > +++ b/gl/lib/heap.c > @@ -36,22 +36,12 @@ static void heapify_up (void **, size_t, > struct heap * > heap_alloc (int (*compare)(const void *, const void *), size_t n_reserve) > { > - struct heap *heap; > - void *xmalloc_ret =3D xmalloc (sizeof *heap); > - heap =3D (struct heap *) xmalloc_ret; > - if (!heap) > - return NULL; > + struct heap *heap =3D xmalloc (sizeof *heap); > > - if (n_reserve <=3D 0) > + if (n_reserve =3D=3D 0) > n_reserve =3D 1; > > - xmalloc_ret =3D xmalloc (n_reserve * sizeof *(heap->array)); > - heap->array =3D (void **) xmalloc_ret; > - if (!heap->array) > - { > - free (heap); > - return NULL; > - } > + heap->array =3D xmalloc (n_reserve * sizeof *(heap->array)); > > heap->array[0] =3D NULL; > heap->capacity =3D n_reserve; > @@ -84,8 +74,7 @@ heap_insert (struct heap *heap, void *item) > if (heap->capacity - 1 <=3D heap->count) > { > size_t new_size =3D (2 + heap->count) * sizeof *(heap->array); > - void *realloc_ret =3D xrealloc (heap->array, new_size); > - heap->array =3D (void **) realloc_ret; > + heap->array =3D xrealloc (heap->array, new_size); Thanks. That looks good. Please push. I noticed that heap_insert's reallocation was awkward and inefficient. Using x2nrealloc rather than xrealloc makes the code cleaner as well as more efficient in the face of a growing heap, and also handles integer overflow. diff --git a/gl/lib/heap.c b/gl/lib/heap.c index a37224f..12a7767 100644 --- a/gl/lib/heap.c +++ b/gl/lib/heap.c @@ -82,15 +82,8 @@ int heap_insert (struct heap *heap, void *item) { if (heap->capacity - 1 <=3D heap->count) - { - size_t new_size =3D (2 + heap->count) * sizeof *(heap->array); - void *realloc_ret =3D xrealloc (heap->array, new_size); - heap->array =3D (void **) realloc_ret; - heap->capacity =3D (2 + heap->count); - - if (!heap->array) - return -1; - } + heap->array =3D x2nrealloc (heap->array, &heap->capacity, + sizeof *(heap->array)); heap->array[++heap->count] =3D item; heapify_up (heap->array, heap->count, heap->compare); From debbugs-submit-bounces@debbugs.gnu.org Tue Jul 13 11:10:20 2010 Received: (at 6600) by debbugs.gnu.org; 13 Jul 2010 15:10:20 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYh7k-00036V-BH for submit@debbugs.gnu.org; Tue, 13 Jul 2010 11:10:20 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1OYh7h-00036O-Dk for 6600@debbugs.gnu.org; Tue, 13 Jul 2010 11:10:18 -0400 Received: (qmail 50470 invoked from network); 13 Jul 2010 15:10:22 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 13 Jul 2010 15:10:22 -0000 Message-ID: <4C3C8194.9020008@draigBrady.com> Date: Tue, 13 Jul 2010 16:09:08 +0100 From: =?UTF-8?B?UMOhZHJhaWcgQnJhZHk=?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: Jim Meyering Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3C2E44.9050009@draigBrady.com> <87hbk34fgz.fsf@meyering.net> In-Reply-To: <87hbk34fgz.fsf@meyering.net> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.8 (--) X-Debbugs-Envelope-To: 6600 Cc: Gene Auyeung , 6600@debbugs.gnu.org, Paul Eggert , Chen Guo X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.8 (--) On 13/07/10 15:35, Jim Meyering wrote: > I noticed that heap_insert's reallocation was awkward and inefficient. > Using x2nrealloc rather than xrealloc makes the code > cleaner as well as more efficient in the face of a growing > heap, and also handles integer overflow. > > diff --git a/gl/lib/heap.c b/gl/lib/heap.c > index a37224f..12a7767 100644 > --- a/gl/lib/heap.c > +++ b/gl/lib/heap.c > @@ -82,15 +82,8 @@ int > heap_insert (struct heap *heap, void *item) > { > if (heap->capacity - 1 <= heap->count) > - { > - size_t new_size = (2 + heap->count) * sizeof *(heap->array); > - void *realloc_ret = xrealloc (heap->array, new_size); > - heap->array = (void **) realloc_ret; > - heap->capacity = (2 + heap->count); > - > - if (!heap->array) > - return -1; > - } > + heap->array = x2nrealloc (heap->array, &heap->capacity, > + sizeof *(heap->array)); > > heap->array[++heap->count] = item; > heapify_up (heap->array, heap->count, heap->compare); Much cleaner and increases with n *= 1.5 rather than n += 2 Testing here shows no change in performance. Do you want me to roll that into my patch? cheers, Pádraig. From debbugs-submit-bounces@debbugs.gnu.org Tue Jul 13 11:16:24 2010 Received: (at 6600) by debbugs.gnu.org; 13 Jul 2010 15:16:24 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYhDc-00039J-2F for submit@debbugs.gnu.org; Tue, 13 Jul 2010 11:16:24 -0400 Received: from smtp1-g21.free.fr ([212.27.42.1]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYhDY-00039E-US for 6600@debbugs.gnu.org; Tue, 13 Jul 2010 11:16:22 -0400 Received: from mx.meyering.net (unknown [82.230.74.64]) by smtp1-g21.free.fr (Postfix) with ESMTP id 5A9AC940051; Tue, 13 Jul 2010 17:16:21 +0200 (CEST) Received: by rho.meyering.net (Acme Bit-Twister, from userid 1000) id 2EE87E12C; Tue, 13 Jul 2010 17:16:20 +0200 (CEST) From: Jim Meyering To: =?utf-8?Q?P=C3=A1draig?= Brady Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. In-Reply-To: <4C3C8194.9020008@draigBrady.com> (=?utf-8?Q?=22P=C3=A1draig?= Brady"'s message of "Tue, 13 Jul 2010 16:09:08 +0100") References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3C2E44.9050009@draigBrady.com> <87hbk34fgz.fsf@meyering.net> <4C3C8194.9020008@draigBrady.com> Date: Tue, 13 Jul 2010 17:16:20 +0200 Message-ID: <87aapv4dkr.fsf@meyering.net> Lines: 38 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -3.3 (---) X-Debbugs-Envelope-To: 6600 Cc: Gene Auyeung , 6600@debbugs.gnu.org, Paul Eggert , Chen Guo X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -3.3 (---) P=C3=A1draig Brady wrote: > On 13/07/10 15:35, Jim Meyering wrote: >> I noticed that heap_insert's reallocation was awkward and inefficient. >> Using x2nrealloc rather than xrealloc makes the code >> cleaner as well as more efficient in the face of a growing >> heap, and also handles integer overflow. >> >> diff --git a/gl/lib/heap.c b/gl/lib/heap.c >> index a37224f..12a7767 100644 >> --- a/gl/lib/heap.c >> +++ b/gl/lib/heap.c >> @@ -82,15 +82,8 @@ int >> heap_insert (struct heap *heap, void *item) >> { >> if (heap->capacity - 1 <=3D heap->count) >> - { >> - size_t new_size =3D (2 + heap->count) * sizeof *(heap->array); >> - void *realloc_ret =3D xrealloc (heap->array, new_size); >> - heap->array =3D (void **) realloc_ret; >> - heap->capacity =3D (2 + heap->count); >> - >> - if (!heap->array) >> - return -1; >> - } >> + heap->array =3D x2nrealloc (heap->array, &heap->capacity, >> + sizeof *(heap->array)); >> >> heap->array[++heap->count] =3D item; >> heapify_up (heap->array, heap->count, heap->compare); > > Much cleaner and increases with n *=3D 1.5 rather than n +=3D 2 > Testing here shows no change in performance. Thanks for the perf. testing. > Do you want me to roll that into my patch? Sure, thanks. From debbugs-submit-bounces@debbugs.gnu.org Tue Jul 13 23:14:31 2010 Received: (at 6600) by debbugs.gnu.org; 14 Jul 2010 03:14:31 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYsQY-0003Vr-JQ for submit@debbugs.gnu.org; Tue, 13 Jul 2010 23:14:30 -0400 Received: from mail-px0-f172.google.com ([209.85.212.172]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OYsQX-0003VS-2k for 6600@debbugs.gnu.org; Tue, 13 Jul 2010 23:14:29 -0400 Received: by pxi20 with SMTP id 20so2477168pxi.3 for <6600@debbugs.gnu.org>; Tue, 13 Jul 2010 20:14:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=QVLioVOqoNqbfQlvIbykD4xqldO3cuNQyyrqNNnqA68=; b=AbhGZI0O8z6S9ln84eZ/0TzwONiw0zOywmJDXM8+6aJIguFC1VY2oFOJvKXGeN6nuu QWLkz6JDVKtzou9RGGYpuuaAXs+GudwKiEMG7EyK1FhXnLegipFSPpU5l5PXroTeV//Z 2e4Y9vh6+GuTlFyRNc5bk1wTUP1pSX5JSprOA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=EauTYLKEORJLSdjb0htvbpPHrxXRCfdEJiQrYtYUyVFS8JFQ6M8eT9KtgHWjsXpu6F DZr+qwpCIfxVwWPUS3O9xUUgF8JfBl/EuPReghH9D9c1i2OHRhMLHA1nqAQGFgzDpIhr 6qOcXBRpjK5Ke1Gznm2rd2OdYVOkJIkOefY0U= MIME-Version: 1.0 Received: by 10.142.134.13 with SMTP id h13mr20461638wfd.119.1279077275341; Tue, 13 Jul 2010 20:14:35 -0700 (PDT) Received: by 10.142.241.3 with HTTP; Tue, 13 Jul 2010 20:14:35 -0700 (PDT) In-Reply-To: <87aapv4dkr.fsf@meyering.net> References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3C2E44.9050009@draigBrady.com> <87hbk34fgz.fsf@meyering.net> <4C3C8194.9020008@draigBrady.com> <87aapv4dkr.fsf@meyering.net> Date: Tue, 13 Jul 2010 20:14:35 -0700 Message-ID: Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. From: Chen Guo To: Jim Meyering Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.6 (--) X-Debbugs-Envelope-To: 6600 Cc: Gene Auyeung , 6600@debbugs.gnu.org, Paul Eggert , =?ISO-8859-1?Q?P=E1draig_Brady?= X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.6 (--) Thanks a lot for all the hard work reviewing and revising this, P=E1draig. From debbugs-submit-bounces@debbugs.gnu.org Wed Jul 14 20:08:31 2010 Received: (at 6600) by debbugs.gnu.org; 15 Jul 2010 00:08:31 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OZC07-00041Y-4d for submit@debbugs.gnu.org; Wed, 14 Jul 2010 20:08:31 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1OZC04-00041P-Cv for 6600@debbugs.gnu.org; Wed, 14 Jul 2010 20:08:29 -0400 Received: (qmail 76922 invoked from network); 15 Jul 2010 00:08:36 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 15 Jul 2010 00:08:36 -0000 Message-ID: <4C3E5134.3040700@draigBrady.com> Date: Thu, 15 Jul 2010 01:07:16 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: 6600@debbugs.gnu.org Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> In-Reply-To: <4C3BBA60.9020201@draigBrady.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.7 (--) X-Debbugs-Envelope-To: 6600 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.7 (--) On 13/07/10 01:59, Pádraig Brady wrote: > I've finally applied the patch. > http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=commit;h=9face836 > > I made a few comment tweaks and added > some dependencies for the heap module. > > I also removed the xmemcoll0() calls > which are separate to this concurrent functionality. > I will add those back in Chen's name after updating to > the latest gnulib. > > Thanks everyone for their work on this! > > Pádraig. > > > > Here's the xmemcoll0 follow up: From: Chen Guo Date: Wed, 14 Jul 2010 07:41:05 +0100 Subject: [PATCH] sort: speed up default full line sorting Don't write NUL after the comparison buffers on each compare, which increases performance by about 3% for short lines on a pentium-m with gcc-4.4.1 * src/sort.c: (fillbuf): Delimit input items with NUL. (write_bytes): Restore the item delimiter char which was replaced with NUL in fillbuf(). --- src/sort.c | 18 +++++++++++++++--- 1 files changed, 15 insertions(+), 3 deletions(-) diff --git a/src/sort.c b/src/sort.c index 5ea1b34..45cb78f 100644 --- a/src/sort.c +++ b/src/sort.c @@ -1743,13 +1743,17 @@ fillbuf (struct buffer *buf, FILE *fp, char const *file) if (buf->buf == ptrlim) return false; if (ptrlim[-1] != eol) - *ptrlim++ = eol; + *ptrlim++ = '\0'; } } /* Find and record each line in the just-read input. */ while ((p = memchr (ptr, eol, ptrlim - ptr))) { + /* Delimit the line with NUL. This eliminates the need to + temporarily replace the last byte with NUL when calling + xmemcoll(), which increases performance. */ + *p = '\0'; ptr = p + 1; line--; line->text = line_start; @@ -2642,7 +2646,13 @@ compare (const struct line *a, const struct line *b, bool show_debug) else if (blen == 0) diff = 1; else if (hard_LC_COLLATE) - diff = xmemcoll (a->text, alen, b->text, blen); + { + /* Note xmemcoll0 is a performance enhancement as + it will not unconditionally write '\0' after the + passed in buffers, which was seen to give around + a 3% increase in performance for short lines. */ + diff = xmemcoll0 (a->text, alen + 1, b->text, blen + 1); + } else if (! (diff = memcmp (a->text, b->text, MIN (alen, blen)))) diff = alen < blen ? -1 : alen != blen; @@ -2652,9 +2662,11 @@ compare (const struct line *a, const struct line *b, bool show_debug) static void write_bytes (struct line const *line, FILE *fp, char const *output_file) { - char const *buf = line->text; + char *buf = line->text; size_t n_bytes = line->length; + *(buf + n_bytes - 1) = eolchar; + /* Convert TABs to '>' and \0 to \n when -z specified. */ if (debug && fp == stdout) { -- 1.6.2.5 From debbugs-submit-bounces@debbugs.gnu.org Thu Jul 15 07:12:38 2010 Received: (at 6600) by debbugs.gnu.org; 15 Jul 2010 11:12:38 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OZMMn-0000cy-01 for submit@debbugs.gnu.org; Thu, 15 Jul 2010 07:12:38 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1OZMMl-0000cq-Ho for 6600@debbugs.gnu.org; Thu, 15 Jul 2010 07:12:36 -0400 Received: (qmail 65705 invoked from network); 15 Jul 2010 11:12:45 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 15 Jul 2010 11:12:45 -0000 Message-ID: <4C3EECDB.9030907@draigBrady.com> Date: Thu, 15 Jul 2010 12:11:23 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: 6600@debbugs.gnu.org, =?ISO-8859-1?Q?Ludovic_Court=E8s?= Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3E5134.3040700@draigBrady.com> In-Reply-To: <4C3E5134.3040700@draigBrady.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.7 (--) X-Debbugs-Envelope-To: 6600 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.7 (--) On 15/07/10 01:07, Pádraig Brady wrote: > On 13/07/10 01:59, Pádraig Brady wrote: >> I've finally applied the patch. >> http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=commit;h=9face836 >> >> I made a few comment tweaks and added >> some dependencies for the heap module. >> >> I also removed the xmemcoll0() calls >> which are separate to this concurrent functionality. >> I will add those back in Chen's name after updating to >> the latest gnulib. >> >> Thanks everyone for their work on this! >> >> Pádraig. > > Here's the xmemcoll0 follow up: And a follow up fix to that which fixes 2 test failures noticed on our integration server: http://hydra.nixos.org/build/486508 commit aadc67dfdb47f28bb8d1fa5e0fe0f52e2a8c51bf Author: Pádraig Brady Date: Thu Jul 15 12:06:04 2010 +0100 sort: fix a bug when sorting unterminated lines * src/sort.c (fillbuf): The previous commit incorrectly terminated the buffer when the last line of input didn't contain a terminating character. diff --git a/src/sort.c b/src/sort.c index 45cb78f..7d31878 100644 --- a/src/sort.c +++ b/src/sort.c @@ -1743,7 +1743,7 @@ fillbuf (struct buffer *buf, FILE *fp, char const *file) if (buf->buf == ptrlim) return false; if (ptrlim[-1] != eol) - *ptrlim++ = '\0'; + *ptrlim++ = eol; } } From debbugs-submit-bounces@debbugs.gnu.org Thu Jul 15 10:08:28 2010 Received: (at 6600) by debbugs.gnu.org; 15 Jul 2010 14:08:28 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OZP6y-0002To-2k for submit@debbugs.gnu.org; Thu, 15 Jul 2010 10:08:28 -0400 Received: from smtp1-g21.free.fr ([212.27.42.1]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OZP6u-0002Td-PJ for 6600@debbugs.gnu.org; Thu, 15 Jul 2010 10:08:26 -0400 Received: from mx.meyering.net (unknown [82.230.74.64]) by smtp1-g21.free.fr (Postfix) with ESMTP id A7D4894012E; Thu, 15 Jul 2010 16:08:30 +0200 (CEST) Received: by rho.meyering.net (Acme Bit-Twister, from userid 1000) id 47850E267; Thu, 15 Jul 2010 16:08:29 +0200 (CEST) From: Jim Meyering To: =?utf-8?Q?P=C3=A1draig?= Brady Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. In-Reply-To: <4C3EECDB.9030907@draigBrady.com> (=?utf-8?Q?=22P=C3=A1draig?= Brady"'s message of "Thu, 15 Jul 2010 12:11:23 +0100") References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3E5134.3040700@draigBrady.com> <4C3EECDB.9030907@draigBrady.com> Date: Thu, 15 Jul 2010 16:08:29 +0200 Message-ID: <87oce8u9b6.fsf_-_@meyering.net> Lines: 51 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -3.3 (---) X-Debbugs-Envelope-To: 6600 Cc: 6600@debbugs.gnu.org, Ludovic =?utf-8?Q?Court=C3=A8s?= X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -3.3 (---) P=C3=A1draig Brady wrote: > On 15/07/10 01:07, P=C3=A1draig Brady wrote: >> On 13/07/10 01:59, P=C3=A1draig Brady wrote: >>> I've finally applied the patch. >>> http://git.savannah.gnu.org/gitweb/?p=3Dcoreutils.git;a=3Dcommit;h=3D9f= ace836 >>> >>> I made a few comment tweaks and added >>> some dependencies for the heap module. >>> >>> I also removed the xmemcoll0() calls >>> which are separate to this concurrent functionality. >>> I will add those back in Chen's name after updating to >>> the latest gnulib. >>> >>> Thanks everyone for their work on this! >>> >>> P=C3=A1draig. >> >> Here's the xmemcoll0 follow up: > > And a follow up fix to that which > fixes 2 test failures noticed on our integration server: > http://hydra.nixos.org/build/486508 > > commit aadc67dfdb47f28bb8d1fa5e0fe0f52e2a8c51bf > Author: P=C3=A1draig Brady > Date: Thu Jul 15 12:06:04 2010 +0100 > > sort: fix a bug when sorting unterminated lines > > * src/sort.c (fillbuf): The previous commit incorrectly > terminated the buffer when the last line of input > didn't contain a terminating character. > > diff --git a/src/sort.c b/src/sort.c > index 45cb78f..7d31878 100644 > --- a/src/sort.c > +++ b/src/sort.c > @@ -1743,7 +1743,7 @@ fillbuf (struct buffer *buf, FILE *fp, char const *= file) > if (buf->buf =3D=3D ptrlim) > return false; > if (ptrlim[-1] !=3D eol) > - *ptrlim++ =3D '\0'; > + *ptrlim++ =3D eol; Thanks. FYI, here's a simple demo of that bug: $ printf a |src/sort src/sort: memory exhausted From debbugs-submit-bounces@debbugs.gnu.org Wed Jul 21 04:13:27 2010 Received: (at 6600) by debbugs.gnu.org; 21 Jul 2010 08:13:28 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1ObUQg-0001QZ-PX for submit@debbugs.gnu.org; Wed, 21 Jul 2010 04:13:27 -0400 Received: from mail-pv0-f172.google.com ([74.125.83.172]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1ObUQf-0001QU-DG for 6600@debbugs.gnu.org; Wed, 21 Jul 2010 04:13:25 -0400 Received: by pvd12 with SMTP id 12so2590403pvd.3 for <6600@debbugs.gnu.org>; Wed, 21 Jul 2010 01:13:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=74TACI6lPpY2ym3KSrkY7zBWztoghKjmizLn97t+OC8=; b=d5/e/vPaZICl9DnLilPZci1gwT2KxjhGFsTmU7DlifHvXDXgWr4i4s0S0wngyAzik6 5x4fFfsqvzP0H0Jdls+udDQg5DKtohGELn1oEk44AEdWDy8NZRMEd0OVQSgC1TfgIm6G Q0sgsCduV3jh2OtaU5Dk5x21z/w8rtpC5YakU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=wkAggI1WM3VD7/tZLVU8UBY49/OGCw7hi9AV5wvG5AiAK6YidLQSC5G1mXxENTWvUc 0gg/sFnTGwzB5ZGtkci1GzWLywMcMOLUEje3y4Wd5qXAqskF7Ee8srCaIOMYH86TwKS6 Sc8lbX6pb8+6Licp+plmoTHkY7HUtIZcA0z7c= MIME-Version: 1.0 Received: by 10.142.157.8 with SMTP id f8mr11575685wfe.85.1279700030841; Wed, 21 Jul 2010 01:13:50 -0700 (PDT) Received: by 10.142.216.2 with HTTP; Wed, 21 Jul 2010 01:13:50 -0700 (PDT) In-Reply-To: <87oce8u9b6.fsf_-_@meyering.net> References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3E5134.3040700@draigBrady.com> <4C3EECDB.9030907@draigBrady.com> <87oce8u9b6.fsf_-_@meyering.net> Date: Wed, 21 Jul 2010 01:13:50 -0700 Message-ID: Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. From: Chen Guo To: 6600@debbugs.gnu.org Content-Type: text/plain; charset=ISO-8859-1 X-Spam-Score: -3.0 (---) X-Debbugs-Envelope-To: 6600 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -3.3 (---) Hi all, So the gcc compile farm just got a 24 core donation from AMD (2x12 at 1.5 GHz), so I couldn't help but run some results. As a way of isolating sort time versus I/O time, I installed a timer output, such that sort prints to stderr the elapsed time during sort()'s call to sortlines(). There are other people using the machine, so the timings wont be the most accurate, but I figure you guys may still be interested. On 24 threads, the pure sort runs in about 15% of the single threaded time, while with I/O that figure's 17.5%. $ for i in 1 2 4 8 12 16 24; do echo "T=$i: "; /usr/bin/time -f "%e" sort --parallel=$i 1M > /dev/null; echo ""; done T=1: Sort without I/O: 11.074463 11.38 T=2: Sort without I/O: 5.672202 5.96 T=4: Sort without I/O: 3.453562 3.71 T=8: Sort without I/O: 2.351003 2.65 T=12: Sort without I/O: 2.100730 2.39 T=16: Sort without I/O: 1.821079 2.09 T=24: Sort without I/O: 1.674106 1.99 From debbugs-submit-bounces@debbugs.gnu.org Wed Jul 21 04:58:13 2010 Received: (at 6600) by debbugs.gnu.org; 21 Jul 2010 08:58:14 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1ObV81-0001jF-0Q for submit@debbugs.gnu.org; Wed, 21 Jul 2010 04:58:13 -0400 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1ObV7y-0001j6-8N for 6600@debbugs.gnu.org; Wed, 21 Jul 2010 04:58:11 -0400 Received: (qmail 93967 invoked from network); 21 Jul 2010 08:58:35 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 21 Jul 2010 08:58:35 -0000 Message-ID: <4C46B6A4.4020301@draigBrady.com> Date: Wed, 21 Jul 2010 09:58:12 +0100 From: =?ISO-8859-1?Q?P=E1draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: Chen Guo Subject: Re: bug#6600: [PATCH] sort: add --threads option to parallelize internal sort. References: <362522.89643.qm@web180012.mail.gq1.yahoo.com> <4B94CAE0.6000106@draigBrady.com> <535984.88146.qm@web180006.mail.gq1.yahoo.com> <4C37C7D9.2030909@draigBrady.com> <4C37E0E2.3060205@cs.ucla.edu> <4C383D5F.4090703@draigBrady.com> <4C3BBA60.9020201@draigBrady.com> <4C3E5134.3040700@draigBrady.com> <4C3EECDB.9030907@draigBrady.com> <87oce8u9b6.fsf_-_@meyering.net> In-Reply-To: X-Enigmail-Version: 1.0.1 Content-Type: multipart/mixed; boundary="------------020600060901050801070203" X-Spam-Score: -2.4 (--) X-Debbugs-Envelope-To: 6600 Cc: 6600@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.4 (--) This is a multi-part message in MIME format. --------------020600060901050801070203 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit On 21/07/10 09:13, Chen Guo wrote: > Hi all, > So the gcc compile farm just got a 24 core donation > from AMD (2x12 at 1.5 GHz), so I couldn't help but run > some results. > As a way of isolating sort time versus I/O time, I installed > a timer output, such that sort prints to stderr the elapsed > time during sort()'s call to sortlines(). > There are other people using the machine, so the > timings wont be the most accurate, but I figure you guys > may still be interested. On 24 threads, the pure sort runs > in about 15% of the single threaded time, while with I/O > that figure's 17.5%. > > $ for i in 1 2 4 8 12 16 24; do echo "T=$i: "; /usr/bin/time -f "%e" > sort --parallel=$i 1M > /dev/null; echo ""; done Cool! I had intended to do this at the weekend on the gcc niagra (32 processor) machine but my DSL died. I also intended to plot the cumulative CPU used, and also with using mutexes rather than spinlocks. Reformatting your results as: 1 11.074463 11.38 2 5.672202 5.96 4 3.453562 3.71 8 2.351003 2.65 12 2.100730 2.39 16 1.821079 2.09 24 1.674106 1.99 And using this gnuplot script: set term pngcairo font 'Sans,10' size 640,480 set output 'sort-amd-24way.png' set title "Multicore sort time on 12x2 AMD" set ylabel "time (seconds)" set xlabel "processors" set xtics (2,4,6,8,12,16,24,32) set xrange [0:32] plot "amd" using 1:2 with lines title "no I/O", \ "amd" using 1:3 with lines title "with I/O" Gives the attached plot. cheers, Pádraig. --------------020600060901050801070203 Content-Type: image/png; name="sort-amd-24way.png" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="sort-amd-24way.png" iVBORw0KGgoAAAANSUhEUgAAAoAAAAHgCAYAAAA10dzkAAAABmJLR0QA/wD/AP+gvaeTAAAg AElEQVR4nOzdeVzVVf7H8ddlExBwg7ugmSJupablBqVZ1tjkNLZppeWomWM5LZZmZWXm2JjL 5LTbtO/aT8s0R80yLRNHLcMyEUHDFNcUIdn5/v5gvGmAAn7v/V7ufT953IfwXT/3jozvzvme 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Date: Wed, 18 Aug 2010 11:24:03 +0000 User-Agent: Fakemail v42.6.9 # This is a fake control message. # # The action: # bug archived. thanks # This fakemail brought to you by your local debbugs # administrator