bug#38167: guix pull takes over 8 GiB of memory to finish if there are no substitutes

[Ludovic Courtès]

Hi!

Danny Milosavljevic <address@hidden> skribis:

> USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
> dannym   19221 20.8 87.4 9404812 6884184 pts/0 Tl   20:34   2:40 
> /gnu/store/sc7z07gim1iq5zvfz1amdwf2irxrzifg-guile-2.2.6/bin/guile 
> --no-auto-compile /home/dannym/.config/guix/current/bin/guix pull

Oh, that’s an RSS of 6 GiB for ‘guix pull’ itself?  Weird, I don’t see
how that can happen.

Could it be that ~/.cache/guix/checkouts/THE-THING is too big, which in
turn causes libgit2 to consume too much memory somehow?

What happens if you attach strace to this process at the moment where
it’s consuming a lot of memory?  Is it traversing Git pack files or
something like that?

TIA,
Ludo’.