GNU bug report logs - #40626
Poor performance on low-end ARMv7 devices

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Package: guix; Severity: important; Reported by: Ludovic Courtès <ludo@HIDDEN>; dated Tue, 14 Apr 2020 16:24:01 UTC; Maintainer for guix is bug-guix@HIDDEN.
Severity set to 'important' from 'normal' Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Danny Milosavljevic <dannym@HIDDEN>
Subject: Re: bug#40626: Poor performance on low-end ARMv7 devices
References: <87a73exj5v.fsf@HIDDEN> <20200414210859.4529c305@HIDDEN>
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Hi Danny,

Danny Milosavljevic <dannym@HIDDEN> skribis:

> root@bpi-iot-ros-ai:/# guix repl
> GNU Guile 2.2.4

This is a fairly old Guix though, so not directly comparable.

Could you try with a current Guix?

(Yeah, you=E2=80=99ll have to pull, and that takes verrrrry loong.  Be sure=
 to
pick a commit that=E2=80=99s fully built on
<https://ci.guix.gnu.org/jobset/guix-modular-master>.)

Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#40626; Package guix. Full text available.

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Date: Tue, 14 Apr 2020 21:08:59 +0200
From: Danny Milosavljevic <dannym@HIDDEN>
To: Ludovic =?ISO-8859-1?Q?Court=E8s?= <ludo@HIDDEN>
Subject: Re: bug#40626: Poor performance on low-end ARMv7 devices
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For comparison, on a Banana Pi M2 Ultra I get:

root@bpi-iot-ros-ai:/# time guix build hello -d --no-grafts
/gnu/store/yp46hszc04dx2zy6kscy1zmjfg9y8flq-hello-2.10.drv

real    0m13.481s
user    0m11.230s
sys     0m0.900s

root@bpi-iot-ros-ai:/# time guix build hello -d --no-grafts
/gnu/store/yp46hszc04dx2zy6kscy1zmjfg9y8flq-hello-2.10.drv

real    0m11.471s
user    0m10.820s
sys     0m0.380s

root@bpi-iot-ros-ai:/# guix repl
GNU Guile 2.2.4
Copyright (C) 1995-2017 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))
;; 3.360000s real time, 3.270000s run time.  0.519000s spent in GC.
scheme@(guix-user)> (define s (open-connection))
scheme@(guix-user)> ,time (package-derivation s hello #:graft? #f)
$1 =3D #<derivation /gnu/store/yp46hszc04dx2zy6kscy1zmjfg9y8flq-hello-2.10.=
drv =3D> /gnu/store/cp0qvs3vxrqiyyxfi8556n52x7ax8khf-hello-2.10 14fabb8>
;; 6.829000s real time, 6.579000s run time.  1.019000s spent in GC.

Processor is a Cortex A7.

Note:

You can do some RAM training and if RAM is connected better on your board,
you can sometimes have staggering speed gains.

See also https://linux-sunxi.org/A10_DRAM_Controller_Calibration

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Information forwarded to bug-guix@HIDDEN:
bug#40626; Package guix. Full text available.

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Subject: Re: bug#40626: Poor performance on low-end ARMv7 devices
To: =?ISO-8859-1?Q?Ludovic_Court=E8s?= <ludo@HIDDEN>,40626 <at> debbugs.gnu.org
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Le 14 avril 2020 09:59:24 GMT-04:00, "Ludovic Court=C3=A8s" <ludo@gnu=2Eorg=
> a =C3=A9crit :
>Hello!
>
>On my Olimex OLinuXino A20, here=E2=80=99s what I get with Guix on Guile =
3=2E0=2E2:
>
>--8<---------------cut here---------------start------------->8---
>$ guix describe
>Generation 1    Apr 11 2020 13:26:01    (current)
>  guix 6720616
>    repository URL: https://git=2Esavannah=2Egnu=2Eorg/git/guix=2Egit
>    commit: 6720616daaf711314827c157a660339990e5cb07
>$ time guix build hello -d --no-grafts
>/gnu/store/s0di07vhva95rl8p3gimlna5ffca7xlq-hello-2=2E10=2Edrv
>
>real    0m9=2E964s
>user    0m8=2E660s
>sys     0m0=2E810s
>--8<---------------cut here---------------end--------------->8---
>
>Most of it seems to go in loading =2Ego files:
>
>--8<---------------cut here---------------start------------->8---
>$ guix repl
>GNU Guile 3=2E0=2E2
>Copyright (C) 1995-2020 Free Software Foundation, Inc=2E
>
>Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'=2E
>This program is free software, and you are welcome to redistribute it
>under certain conditions; type `,show c' for details=2E
>
>Enter `,help' for help=2E
>scheme@(guix-user)> ,time (use-modules (guix) (gnu) (gnu packages
>base))
>;; 8=2E104000s real time, 6=2E879000s run time=2E  0=2E755000s spent in G=
C=2E
>scheme@(guix-user)> (define s (open-connection))
>scheme@(guix-user)> ,time (package-derivation s hello #:graft? #f)
>$1 =3D #<derivation
>/gnu/store/s0di07vhva95rl8p3gimlna5ffca7xlq-hello-2=2E10=2Edrv =3D>
>/gnu/store/z4ig2v79x3y7r5w1gs7rg7cgyvja4dn1-hello-2=2E10 31a5bb8>
>;; 3=2E101000s real time, 2=2E493000s run time=2E  0=2E324000s spent in G=
C=2E
>--8<---------------cut here---------------end--------------->8---
>
>Ludo=E2=80=99=2E

In case it helps, I observe the same kind of timing on my cubietruck (same=
 guile, but guix from april 1st)=2E It's slightly faster than you, the proc=
essor is a cortex-a7=2E
Information forwarded to bug-guix@HIDDEN:
bug#40626; Package guix. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: Poor performance on low-end ARMv7 devices
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Hello!

On my Olimex OLinuXino A20, here=E2=80=99s 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 =3D #<derivation /gnu/store/s0di07vhva95rl8p3gimlna5ffca7xlq-hello-2.10.=
drv =3D> /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=E2=80=99.
Acknowledgement sent to Ludovic Courtès <ludo@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#40626; Package guix. Full text available.
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Last modified: Thu, 16 Apr 2020 08:30:01 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.