From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Bavier Subject: Re: [PATCH 4/4] gnu: matplotlib: Add gtk3 backends. Date: Tue, 23 Dec 2014 13:27:26 -0600 Message-ID: <87mw6edv4x.fsf@gmail.com> References: <878ui8edzl.fsf@gnu.org> <87vblahv6n.fsf@gnu.org> <878uhzkynx.fsf@gnu.org> <87fvc6jked.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:48094) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y3V6n-0000Ae-Fe for guix-devel@gnu.org; Tue, 23 Dec 2014 14:27:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Y3V6h-0003wr-GC for guix-devel@gnu.org; Tue, 23 Dec 2014 14:27:05 -0500 In-reply-to: <87fvc6jked.fsf@gnu.org> List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org To: =?utf-8?Q?Ludovic_Court=C3=A8s?= Cc: Guix-devel , Federico Beffa Ludovic Courtès writes: > Federico Beffa skribis: > >> The build does finish as I've tested it on my machine before >> committing the package. However, for some reason, guix needs very long >> to generate the derivation. On my machine (quad-core Xeon E5520) >> python2-matplotlib takes ca. 31 mins to start building. >> Python2-scipy, which includes python2-matplotlib, takes ca. 80 mins.! > > Eric Bavier skribis: > >> I wonder if this could this be a result of package-with-python2's >> behavior of recursively creating new package objects for each input in a >> package. As Ludovic suggested, this could easily create very large DAGs >> that then need to be processed. >> >> This behavior of package-with-python2 was giving me a nightmare when >> trying to code some improvements to `guix refresh -l`, since there would >> easily become tens or hundreds of logically identical python package >> objects floating through the package dependency DAG. > > Ouch, thanks for putting me on the right track. Basically > ‘package-with-explicit-python’ was recursing way too much, leading to > hundreds of unique package objects, and thus defeating memoization of > ‘package-derivation’. > > Commit 78a2745 fixes that. ‘guix build python2-matplotlib -n > --no-substitutes’ takes ~5 seconds on my laptop (which is still too much > IMO, but that’s another story.) I’ve thus reinstated numpy, scipy, > etc. Great. > Eric: the good news is that you can now resume work on ‘guix refresh > -l’. ;-) Will do. Thanks for the help! -- Eric Bavier Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html