Rostislav Svoboda schreef op wo 11-05-2022 om 17:37 [+0200]:
> [env]$ time ./pre-inst-env guix build openjdk

Did you run this after it was already built, or before?  If the former,
it probably just counts time grafting (4min seems about accurate for
openjdk in my experience) due to some new grafts since last time.

For timing build times, I recommend:

# --no-grafts: don't do grafts to avoid counting time grafting
# --check --rounds=1: build it again
$ time ./pre-inst-env guix build openjdk --no-grafts --check --rounds=1

though that only does somethin usefu

> ...
> real 4m32.993s
> user 0m26.175s
> sys 0m1.357s

I compiled it with cores=1 or cores=4 or cores=8 (not sure which).
Since apparently you have a 24 core computer, multiplying by 24 would
give an estimate of 108m ≅ 2 hours for cores=1.  Though it ran much
longer than that on my computer (at least 12h), so I don't understand,
unless there was grafting involved.

I don't think it really matters though, so maybe we can drop this?

Greetings,
Maxime.