Re: Guix pull speed

[Simon Tournier]

Hi Josselin,

On Wed, 06 Sep 2023 at 11:45, Josselin Poiret <dev@jpoiret.xyz> wrote:

>> Well, on my machine, the bigger bottleneck seems the procedure name
>> ’proxy’ which copies stuff around, IIUC. See [1].
>
> Proxy is on the helper script side, it's just waiting for the actual
> build script to do its thing.

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

>> Hum, is this ’graphml’ something you have not submitted?  Or am I
>> missing a point?  Last time I played with “guix graph”, I wrote a small
>> script for bridging with networkx.  See [2].
>
> I've committed it pretty recently, and should work OOTB now.

Cool!


>>> You can compare with a compiled check-out of guix by just running the
>>> following in a `guix repl`:
>>> --8<---------------cut here---------------start------------->8---
>>> (use-modules (guix self) (guix monad-repl))
>>> ,run-in-store (guix-derivation (getcwd) "0.0-git" #:pull-version 1)
>>> --8<---------------cut here---------------end--------------->8---
>>> which takes at most 5 seconds on my laptop.
>>
>> Yeah, that’s fast. :-)
>>
>> For comparing, what would be the corresponding derivations that “guix
>> pull” is building?
>
> 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?


Cheers,
simon