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Re: How/When will guix pull stop to compile the 616 files?

From: Ricardo Wurmus
Subject: Re: How/When will guix pull stop to compile the 616 files?
Date: Wed, 09 Aug 2017 10:08:29 +0200
User-agent: mu4e 0.9.18; emacs 25.2.1

Jack Hill <address@hidden> writes:

> On Tue, 8 Aug 2017, Ricardo Wurmus wrote:
>> Paul Dufresne <address@hidden> writes:
>>> It takes 45 mins. on my relatively old dual core to guix-pull
>> Yeah, this isn’t great.  Since 0.13.0 compilation is slower and requires
>> a whole lot more memory.  That’s a known problem.
>> There are some ideas to reduce the amount of compilation that has to
>> happen locally, but it isn’t quite as simple as a first look may
>> suggest.
> Could building be avoided entirely with substitutes? Are substitutes not
> appropriate for some reason, or is it just that substitutes are not
> produced on Hydra for every guix commit?

Before a substitute can be requested, Guix will have to compute a
derivation locally.  In the case of Guix itself this is rather

Once we have the derivation we can ask substitute servers if they have a
binary substitute for performing the work the derivation describes.

So, local *computation* cannot be avoided, but local building should be
avoidable for most packages — here the problem is that hydra isn’t fast
enough yet.  I’ve been preparing an alternative build farm at the
institute where I work, which will hopefully soon be powerful enough to
build packages more quickly than our current Hydra does.


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