Stefano Lattarini <stefano.lattarini@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 12620) by debbugs.gnu.org; 26 Dec 2013 16:46:59 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Dec 26 11:46:59 2013 Received: from localhost ([127.0.0.1]:44130 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1VwE5L-00029h-Cs for submit <at> debbugs.gnu.org; Thu, 26 Dec 2013 11:46:59 -0500 Received: from mail-ee0-f42.google.com ([74.125.83.42]:65465) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <stefano.lattarini@HIDDEN>) id 1VwE5I-00029T-Py; Thu, 26 Dec 2013 11:46:57 -0500 Received: by mail-ee0-f42.google.com with SMTP id e53so3776623eek.29 for <multiple recipients>; Thu, 26 Dec 2013 08:46:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:mime-version:to:cc:subject:content-type :content-transfer-encoding; bh=Do07e+vDgl+T5P9XNLvqI/8UIsuL9HjDGM1/Zz72PJ0=; b=os48ecGC4L31+DeoJlVC5HDVEVQlOflN+/5NHVpoHyNzZA+5YlJSvHxknDRFMta9xx SaeYFhqHCvBpRY2YFDYeC8gwB1dYcedjoi/EgKMvJ549J7FF4r74x7HSzLG0PlyEKLT1 mWzOUgO6JLm++TOsA2qQ049lkrGUo6hNmKudipKVmnnnf+WkqqEUTWQhpMbqhkNI3ZnB tlizhG3iQ1xlLcvZ5k1UNx1rZnqlk5ByzlbTbDP2JbLZVR7JKe0hHpDJrTyY91vu9N0x a+aKbxT34Z+zclr+Doy7/akG/WbOhshQ991A6qKS9IAlNOebFgIk0QSWf1LxBlGnz9uY KIcg== X-Received: by 10.15.45.135 with SMTP id b7mr8408407eew.88.1388076415906; Thu, 26 Dec 2013 08:46:55 -0800 (PST) Received: from [192.168.0.101] (host143-4-dynamic.5-87-r.retail.telecomitalia.it. [87.5.4.143]) by mx.google.com with ESMTPSA id b41sm74201656eef.16.2013.12.26.08.46.51 for <multiple recipients> (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 26 Dec 2013 08:46:55 -0800 (PST) Message-ID: <52BC5D78.6000006@HIDDEN> Date: Thu, 26 Dec 2013 17:46:48 +0100 From: Stefano Lattarini <stefano.lattarini@HIDDEN> MIME-Version: 1.0 To: 12620 <at> debbugs.gnu.org Subject: Re: Parallel tests vs fast tests (and beyond) Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 12620 Cc: Reuben Thomas <rrt@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) severity 12620 wishlist stop Reference: <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12620> Marking this as a "wishlist" rather than a bug, since the current implementation of parallel tests is working correctly and is mostly "good enough", and your proposal is thus geared towards improving an already decent situation rather than fixing errors or misbehaviors (this doesn't mean I'm denying or belittling the merits of your proposal, of course). Just one nit: Reuben Thomas wrote: > > The implication of the 1.12 release notes is that serial-tests > will be dropped at some point post-1.13. > I've been convinced that any idea I had in such a direction was misguided; the old serial harness is now marked merely as "discouraged", but there no plans to deprecate pr remove it in the foreseeable future. Thanks, Stefano
bug-automake@HIDDEN:bug#12620; Package automake.
Full text available.Received: (at 12620) by debbugs.gnu.org; 11 Oct 2012 21:41:11 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Oct 11 17:41:11 2012 Received: from localhost ([127.0.0.1]:39997 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1TMQVA-0005b0-F2 for submit <at> debbugs.gnu.org; Thu, 11 Oct 2012 17:41:08 -0400 Received: from exprod7og116.obsmtp.com ([64.18.2.219]:47340) by debbugs.gnu.org with smtp (Exim 4.72) (envelope-from <rrt@HIDDEN>) id 1TMQV7-0005aq-GQ for 12620 <at> debbugs.gnu.org; Thu, 11 Oct 2012 17:41:08 -0400 Received: from mail-wg0-f72.google.com ([74.125.82.72]) (using TLSv1) by exprod7ob116.postini.com ([64.18.6.12]) with SMTP ID DSNKUHc8wVuIJ+IKgpjIBNDAHnCRWw1a82hq@HIDDEN; Thu, 11 Oct 2012 14:40:18 PDT Received: by mail-wg0-f72.google.com with SMTP id dr12so1259045wgb.3 for <12620 <at> debbugs.gnu.org>; Thu, 11 Oct 2012 14:40:16 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:x-gm-message-state; bh=id1NYDndggefKQr5olXXl9k51OzYmpgeSFVxpQ+fEfQ=; b=lGCkv/flgMuJgTqryiw79OUJoBeXi/Udv+1+YSQ8m+pB8+OpVjfWItHC4wZDEhbqiv 2N4JMp+Ntyf3xf5G5565YtOK3GYAYK/pw0datJhpFB/EiOpqm9g1rAKk9xrbfiUJA+1L XyIC/rjMzX48hi4blWjZoxtZKtSRA43D2jMwfIreINUlzUZfKkxybnTqQGScPV61+5lR KR31eCFPZ4xZ9q7wvLc7vgRkngdoIPkuz15Mw8AVNIjw/qvyd52gtJL54uYdl1UZG6dJ tRlGaXTRVaqJ5qtthcDXRVk92tdm1WxUrx9ouUvJEJpPW1X46gUpPW/a/S/R9E0qRsJH MgeQ== Received: by 10.14.4.198 with SMTP id 46mr4118321eej.11.1349991616362; Thu, 11 Oct 2012 14:40:16 -0700 (PDT) MIME-Version: 1.0 Received: by 10.14.4.198 with SMTP id 46mr4118315eej.11.1349991616277; Thu, 11 Oct 2012 14:40:16 -0700 (PDT) Received: by 10.14.133.201 with HTTP; Thu, 11 Oct 2012 14:40:16 -0700 (PDT) In-Reply-To: <CAEnY7O-rikuU3_W_6HTGoy6Q_zedHsFhNXoX=_wFm45eu24AWA@HIDDEN> References: <CAOnWdoix5PAoUrXPwyq8zeTjpgkpGEnz4VwWVxFUebhKk+pg9g@HIDDEN> <CAEnY7O-rikuU3_W_6HTGoy6Q_zedHsFhNXoX=_wFm45eu24AWA@HIDDEN> Date: Thu, 11 Oct 2012 22:40:16 +0100 Message-ID: <CAOnWdoiX4mGp1Z+vppDJ=DswceGZWutH_HgjK5wM4g86Tt_Ncg@HIDDEN> Subject: Re: bug#12620: Parallel tests vs fast tests (and beyond) From: Reuben Thomas <rrt@HIDDEN> To: Jack Kelly <jack@HIDDEN> Content-Type: text/plain; charset=ISO-8859-1 X-Gm-Message-State: ALoCoQlNipcE+u7URF+XuOR48DPxslEobOgHqc2tnLHS1rIuXcU7sw65RQPiHCfPbukTIHFGWMf4JL+6ZfbcBl1Ni8vwF6mzKD2XVZLpn3dIhWmElP0PaKBZGP+rD54ms6sRXC4GlMgQlyfIhysg5/L5Wh23pkaBEGz2wUBU5v5zcneSyy4PHA0= X-Spam-Score: -1.5 (-) X-Debbugs-Envelope-To: 12620 Cc: 12620 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -1.5 (-) On 11 October 2012 22:12, Jack Kelly <jack@HIDDEN> wrote: > > We had a discussion along these lines when refactoring elisp > compilation: in the past it was all done in one big batch. Now it's > done with an emacs invocation per .el file. The result of that > discussion was that while you slow down single core machines, the new > way of doing things fits make's model much better: instead of fiddling > around with stamp files, the Makefile just has a suffix rule. That's very interesting, of course that's the way make works naturally for C programs, and I never thought of changing it (although I read about how much faster for compiling several files it is, but it only ever occurred to me that it would be nice to batch up compilations for building from source, not for development where typically you may only need to recompile one file). -- http://rrt.sc3d.org
bug-automake@HIDDEN:bug#12620; Package automake.
Full text available.Received: (at 12620) by debbugs.gnu.org; 11 Oct 2012 21:13:56 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Oct 11 17:13:56 2012 Received: from localhost ([127.0.0.1]:39989 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1TMQ4q-0004zV-4n for submit <at> debbugs.gnu.org; Thu, 11 Oct 2012 17:13:56 -0400 Received: from mail-wi0-f174.google.com ([209.85.212.174]:47471) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from <endgame.dos@HIDDEN>) id 1TMQ4l-0004zF-KO for 12620 <at> debbugs.gnu.org; Thu, 11 Oct 2012 17:13:54 -0400 Received: by mail-wi0-f174.google.com with SMTP id hq7so7669418wib.15 for <12620 <at> debbugs.gnu.org>; Thu, 11 Oct 2012 14:12:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=+mPkPwqLnnQbWZz+FLFpD2FIj7f4PgplmCp07ZuOH2g=; b=vOMpb4Q087rrDDRrsyiTDrlFlfwoHarT8xcJALb0XmYlncEaLWr3ObGXey0sbrSLV7 H7/5bSNCTQWWnIwuarG/xrVstm3Dk0+UreFby2KzRdhqy3i0lvS4vDWhRe63LvNUlufO +0JYd9fYKG3maKMgi6pRLQEHY2bxYZHml+S62/1jyA1hK6/ZbSAVW937r+Iy4Xnt4VY3 QmoOIN/w1W5DvrIikRM86NfsF8+rFmjasTXPTvobK6dr+8j1E4HEajleVWLa9mtbFmQS cVGaVg3JT40DnF0pNbLoaYJYs12j/s385rlgDOUakFUEHmuv35x6PMia6KIIctuHfck7 6LTw== MIME-Version: 1.0 Received: by 10.180.79.103 with SMTP id i7mr773621wix.13.1349989979434; Thu, 11 Oct 2012 14:12:59 -0700 (PDT) Received: by 10.194.61.116 with HTTP; Thu, 11 Oct 2012 14:12:59 -0700 (PDT) In-Reply-To: <CAOnWdoix5PAoUrXPwyq8zeTjpgkpGEnz4VwWVxFUebhKk+pg9g@HIDDEN> References: <CAOnWdoix5PAoUrXPwyq8zeTjpgkpGEnz4VwWVxFUebhKk+pg9g@HIDDEN> Date: Fri, 12 Oct 2012 08:12:59 +1100 X-Google-Sender-Auth: CYSH8IE-dgQMJSDeRzskGrtyhb0 Message-ID: <CAEnY7O-rikuU3_W_6HTGoy6Q_zedHsFhNXoX=_wFm45eu24AWA@HIDDEN> Subject: Re: bug#12620: Parallel tests vs fast tests (and beyond) From: Jack Kelly <jack@HIDDEN> To: Reuben Thomas <rrt@HIDDEN> Content-Type: text/plain; charset=ISO-8859-1 X-Spam-Score: 0.1 (/) X-Debbugs-Envelope-To: 12620 Cc: 12620 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: 0.1 (/) On Thu, Oct 11, 2012 at 6:53 AM, Reuben Thomas <rrt@HIDDEN> wrote: > This whole problem is an instance of a more general problem, of which > another example is parallel make: for best performance, it should > probably batch up calls to gcc, for example, so that multiple source > files are compiled by each invocation. We had a discussion along these lines when refactoring elisp compilation: in the past it was all done in one big batch. Now it's done with an emacs invocation per .el file. The result of that discussion was that while you slow down single core machines, the new way of doing things fits make's model much better: instead of fiddling around with stamp files, the Makefile just has a suffix rule. IMHO, your point is valid, but to do it safely would require a tool smarter than make. -- Jack
bug-automake@HIDDEN:bug#12620; Package automake.
Full text available.Received: (at submit) by debbugs.gnu.org; 10 Oct 2012 19:54:44 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Oct 10 15:54:44 2012 Received: from localhost ([127.0.0.1]:38078 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1TM2Md-0003Lw-Fo for submit <at> debbugs.gnu.org; Wed, 10 Oct 2012 15:54:43 -0400 Received: from eggs.gnu.org ([208.118.235.92]:46756) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from <rrt@HIDDEN>) id 1TM2Ma-0003Li-Ee for submit <at> debbugs.gnu.org; Wed, 10 Oct 2012 15:54:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <rrt@HIDDEN>) id 1TM2Lp-0000qC-OS for submit <at> debbugs.gnu.org; Wed, 10 Oct 2012 15:53:54 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_HI, T_FRT_LOLITA1 autolearn=unavailable version=3.3.2 Received: from lists.gnu.org ([208.118.235.17]:53450) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <rrt@HIDDEN>) id 1TM2Lp-0000q7-Ko for submit <at> debbugs.gnu.org; Wed, 10 Oct 2012 15:53:53 -0400 Received: from eggs.gnu.org ([208.118.235.92]:33822) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <rrt@HIDDEN>) id 1TM2Ln-000333-GT for bug-automake@HIDDEN; Wed, 10 Oct 2012 15:53:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <rrt@HIDDEN>) id 1TM2Ll-0000pD-Pg for bug-automake@HIDDEN; Wed, 10 Oct 2012 15:53:51 -0400 Received: from exprod7og118.obsmtp.com ([64.18.2.8]:57858) by eggs.gnu.org with smtp (Exim 4.71) (envelope-from <rrt@HIDDEN>) id 1TM2Ll-0000on-Gl for bug-automake@HIDDEN; Wed, 10 Oct 2012 15:53:49 -0400 Received: from mail-ie0-f169.google.com ([209.85.223.169]) (using TLSv1) by exprod7ob118.postini.com ([64.18.6.12]) with SMTP ID DSNKUHXSSmQ+r+9FVttIbH1+kJJ/AsXWKm3o@HIDDEN; Wed, 10 Oct 2012 12:53:49 PDT Received: by mail-ie0-f169.google.com with SMTP id 10so2111228ied.0 for <bug-automake@HIDDEN>; Wed, 10 Oct 2012 12:53:46 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type :x-gm-message-state; bh=qne/laEsrwO0ypx3E6Xr8G5EeDO72zij6jAo9bhFXl4=; b=RX/BS9+asJwv3pFsQvKo/1OqJZOBRCaob7KtG9l9CORNTjQFlXAQetrZnp+ZLS0rMg RU7LLNKx9xRsWEHtcZfBB8OqUjwFl5d0RA2GGFj2T+o1i1Pk/791hAEPu3LBEigEoHrA y/+GTnqvP3kpjC42TUFRkdpc1sSN2O1/2Lr5aYmne0WQY97WUSwD7XUEaUwD4GrcACbG JUcUyAoo8QyRoo4VGKjEDiE+jbAnppencXalkfmjQBtJfMbtYULuvtKMfdeGWbif+Mik egY9SLTXjGNP/CKHl5ETtaLci5AHLDboN3RpStuHjwz2nq3qNIr1XALgbEURwV+h6yXw iKbw== MIME-Version: 1.0 Received: by 10.42.156.1 with SMTP id x1mr19280187icw.51.1349898826565; Wed, 10 Oct 2012 12:53:46 -0700 (PDT) Received: by 10.231.240.1 with HTTP; Wed, 10 Oct 2012 12:53:46 -0700 (PDT) Date: Wed, 10 Oct 2012 20:53:46 +0100 Message-ID: <CAOnWdoix5PAoUrXPwyq8zeTjpgkpGEnz4VwWVxFUebhKk+pg9g@HIDDEN> Subject: Parallel tests vs fast tests (and beyond) From: Reuben Thomas <rrt@HIDDEN> To: bug-automake <bug-automake@HIDDEN> Content-Type: text/plain; charset=ISO-8859-1 X-Gm-Message-State: ALoCoQnO5K8RMGdnn2G50YXZBB1wjo5ZTR8G5zP37ZdP+uhrBex1+WbaI67GZNU9f1IuMcAByQhf X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 208.118.235.17 X-Spam-Score: -3.5 (---) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -3.5 (---) With the recent work on parallel tests in automake I thought it was time to give them a spin, so I did, for the "zee" branch of GNU Zile. This has about 100 tests, the total wall clock time being around 8s on my 2.5GHz 4-core Sandy Bridge machine, with the following target: check-local: $(builddir)/src/zee echo $(TESTS) | $(LUA_ENV) $(LUA_TESTS_ENVIRONMENT) xargs $(RUNLUATESTS) So, I rewrote it as: LOG_COMPILER = $(LUA_ENV) $(LUA_TESTS_ENVIRONMENT) $(RUNLUATESTS) and lo! it ran in 2/3 of the time. Not bad for a few minutes' work. But then I looked closer, and noticed that although the wall-clock time had gone down, the user+system time had almost doubled. Oops: I was only winning because I had four cores. Developers using single-core or dual-core machines might well lose out with parallel tests. The test harness is a Lua script, so the parallel tests were starting an extra Lua interpreter per test, so this is not a huge surprise, but it is a pity. In the end, I found I got a much bigger speed up (down to under 3s), with: check-local: $(builddir)/src/zee NPROC=`nproc`; \ echo $(LUA_TESTS) | $(LUA_ENV) $(LUA_TESTS_ENVIRONMENT) xargs --max-procs=$$NPROC --max-args=$$(( `echo $(LUA_TESTS) | wc -w` / $$NPROC + 1 )) $(RUNLUATESTS) > /dev/null That would be relatively straightforward to make portable (or rather, bail out if non-GNU xargs is used, but it's still much clumsier than parallel-tests, and of course uses the old serial-tests. (I'm working with automake 1.11.6, in case it matters.) The implication of the 1.12 release notes is that serial-tests will be dropped at some point post-1.13. This whole problem is an instance of a more general problem, of which another example is parallel make: for best performance, it should probably batch up calls to gcc, for example, so that multiple source files are compiled by each invocation. I can imagine a view that we're rapidly increasing the number of cores, so in fact there's little point working on these intermediate solutions, but it seems to me that it's not just less-well-off developers who could benefit, but also compile farms. Comments? Solutions I've missed? -- http://rrt.sc3d.org
Reuben Thomas <rrt@HIDDEN>:bug-automake@HIDDEN.
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