Andy Wingo <wingo@igalia.com> writes:

> On Thu 20 Apr 2017 14:35, ludo@gnu.org (Ludovic Courtès) writes:
>
>> ludo@gnu.org (Ludovic Courtès) skribis:
>>
>>> ;; 2.724686s real time, 3.117062s run time.  0.880827s spent in GC.
>>> scheme@(guile-user)> (version)
>>> $1 = "2.0.13"
>>>
>> scheme@(guile-user)> ,use(guix scripts build)
>> scheme@(guile-user)> ,time (guix-build "libreoffice" "certbot" "xmonad" "-n" "--no-substitutes" "--no-build-hook")
>>
>> [...]
>>
>> ;; 1.826528s real time, 1.994426s run time.  0.382750s spent in GC.
>> scheme@(guile-user)> (version)
>> $1 = "2.2.1"
>>
>> That’s a 33% speedup compared to 2.0.
>
> That is a 50% speedup compared to 2.0 :)  If we consider its speed as
> being how many times you could do this per second, then 2.0 speed is
> 1/2.72, and 2.2.1 speed is 1/1.82.  Speed ratio is then
> 2.72/1.82=1.4945.  So 2.2.1 is 1.5x the speed of 2.0, or 50% faster :)
>
> Andy, who is not looking for praise, but who likes perf numbers :)

Impressive :). Is there a blog post/article/information somewhere about
what went in Guile to make it that faster?

Thank you for your work!

Maxim