From: Mark H Weaver <mhw@netris.org>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>
Subject: Re: [PATCH 4/4] gnu: matplotlib: Add gtk3 backends.
Date: Wed, 24 Dec 2014 10:34:24 -0500 [thread overview]
Message-ID: <87a92d3vun.fsf@netris.org> (raw)
In-Reply-To: <87fvc6jked.fsf@gnu.org> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\= \=\?utf-8\?Q\?s\?\= message of "Tue, 23 Dec 2014 19:22:50 +0100")
ludo@gnu.org (Ludovic Courtès) writes:
> Federico Beffa <beffa@ieee.org> 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 <ericbavier@gmail.com> 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.
This seems to have fixed Hydra as well. Previously, it was timing out
(after 3 hours) while trying to evaluate jobsets. Hydra is now building
the xorg-updates branch.
Thanks!
Mark
prev parent reply other threads:[~2014-12-24 15:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-14 19:52 [PATCH 4/4] gnu: matplotlib: Add gtk3 backends Federico Beffa
2014-12-15 22:37 ` Ludovic Courtès
2014-12-17 19:25 ` Federico Beffa
2014-12-17 20:34 ` Ludovic Courtès
2014-12-18 17:09 ` Federico Beffa
2014-12-23 0:17 ` Ludovic Courtès
2014-12-23 17:09 ` Federico Beffa
2014-12-23 17:43 ` Eric Bavier
2014-12-23 18:22 ` Ludovic Courtès
2014-12-23 19:27 ` Eric Bavier
2014-12-24 15:34 ` Mark H Weaver [this message]
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