Subject: bug#40626: Poor performance on low-end ARMv7 devices

From: Julien Lepiller <[email-masked]>
Date: Tue, 14 Apr 2020 14:08:00 -0400

Le 14 avril 2020 09:59:24 GMT-04:00, "Ludovic Courtès" <[email-masked]> a écrit :
>Hello!
>
>On my Olimex OLinuXino A20, here’s what I get with Guix on Guile 3.0.2:
>
>--8<---------------cut here---------------start------------->8---
>$ guix describe
>Generation 1    Apr 11 2020 13:26:01    (current)
>  guix 6720616
>    repository URL: https://git.savannah.gnu.org/git/guix.git
>    commit: 6720616daaf711314827c157a660339990e5cb07
>$ time guix build hello -d --no-grafts
>/gnu/store/s0di07vhva95rl8p3gimlna5ffca7xlq-hello-2.10.drv
>
>real    0m9.964s
>user    0m8.660s
>sys     0m0.810s
>--8<---------------cut here---------------end--------------->8---
>
>Most of it seems to go in loading .go files:
>
>--8<---------------cut here---------------start------------->8---
>$ guix repl
>GNU Guile 3.0.2
>Copyright (C) 1995-2020 Free Software Foundation, Inc.
>
>Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
>This program is free software, and you are welcome to redistribute it
>under certain conditions; type `,show c' for details.
>
>Enter `,help' for help.
>scheme@(guix-user)> ,time (use-modules (guix) (gnu) (gnu packages
>base))
>;; 8.104000s real time, 6.879000s run time.  0.755000s spent in GC.
>scheme@(guix-user)> (define s (open-connection))
>scheme@(guix-user)> ,time (package-derivation s hello #:graft? #f)
>$1 = #<derivation
>/gnu/store/s0di07vhva95rl8p3gimlna5ffca7xlq-hello-2.10.drv =>
>/gnu/store/z4ig2v79x3y7r5w1gs7rg7cgyvja4dn1-hello-2.10 31a5bb8>
>;; 3.101000s real time, 2.493000s run time.  0.324000s spent in GC.
>--8<---------------cut here---------------end--------------->8---
>
>Ludo’.

In case it helps, I observe the same kind of timing on my cubietruck (same guile, but guix from april 1st). It's slightly faster than you, the processor is a cortex-a7.