Re: Guix pull speed

[Josselin Poiret <dev@jpoiret.xyz>]

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Simon Tournier <zimon.toutoune@gmail.com> writes:

> Do it copy on the fly?  I mean, is it first written somewhere then moved?

It just copies the output of the building process, which shouldn't be
too big.  It's waiting for build output though, hence why it's taking so
much time.

>> It's building the same!  Just that building the derivation takes way
>> longer because it has first to load a bunch of uncompiled guile files.
>
> Well, I am not sure to follow.  Is your point not about why it
> takes longer?
>
> If it is the same, these 5 seconds is not why “guix pull” is slow, no?

It's the same process, but in one case it's done with an already
compiled tree, so loading the files is instantaneous, but on `guix pull`
the tree is not compiled yet (that's the whole point of `guix pull`!)
and so loading these 300+ guile files is extremely slow.

Best,
-- 
Josselin Poiret

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