[bug#38649] [PATCH] Parallelize `guix package`

[Brett Gilio <brettg@posteo.net>]

Dec 17, 2019 8:34:25 AM Leo Prikler :

> Am Dienstag, den 17.12.2019, 14:20 +0000 schrieb Brett Gilio:
>
> >
> > Dec 17, 2019 8:19:14 AM Leo Prikler :
> >
> >
> > > Hi Guix!
> > >
> > > Yesterday I had an interesting conversation on IRC about the
> > > behaviour
> > > of multiple `guix package` processes running in parallel.
> > > Specifically, when two transactions target the same profile
> > > (usually
> > > /var/guix/profiles/per-user/$USER/guix-profile) at the same time,
> > > one
> > > of them will fail to claim the lock and abort. 0001 makes it so
> > > that
> > > the process waits for the lock. 0002 makes it so that packages
> > > specified via -i can be built in parallel.
> > >
> > > Regards,
> > > Leo
> > >
> > >
> >
> > Can we extend this to include things like environment --ad-hoc?
> >
> `guix environment` does not claim any locks, so it does not suffer from
> the problem that this patch tries to address. Perhaps my wording was
> bad: By "can be built in parallel", I meant that if one starts two
> processes, e.g. `guix install emacs` and `guix install ffmpeg`, emacs
> and ffmpeg are built in parallel. This does not mean, that
> dependencies of emacs are built in parallel ? for that you'd have to
> dig closer to the core.
>
> Regards,
> Leo
>

Ah right. My mistake. I just woke up, so I think I need more coffee. :)

Brett Gilio