Some code in guix-package* is somehow reached multiple times without any clear reason?

Some code in guix-package* is somehow reached multiple times without any clear reason?

[Evan Cooney]

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Hello guix developers,

I was profiling each expression in guix-package* trying to find which
expression takes the most time to evaluate when I noticed the profiling
command displaying data multiple times despite wrapping an expression that
looks like it's only evaluated one time. Here is the code:
https://paste.debian.net/1334468/. I checked the definition of
call-build-hander and only invokes its thunk argument one time, so I have
no idea what's going on here. Could someone explain why this might be
happening?

Here is the output produced when installing librewolf:
https://paste.debian.net/1334470/

It's mostly profiling data, but the point is that there is more than one
report from the profiler, meaning  that it was called more than one time.

Thank you,
Evan Cooney

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Re: Some code in guix-package* is somehow reached multiple times without any clear reason?

[Ludovic Courtès]

Hi Evan,

Evan Cooney <evancooney71@gmail.com> skribis:

> I was profiling each expression in guix-package* trying to find which
> expression takes the most time to evaluate when I noticed the profiling
> command displaying data multiple times despite wrapping an expression that
> looks like it's only evaluated one time. Here is the code:
> https://paste.debian.net/1334468/. I checked the definition of
> call-build-hander and only invokes its thunk argument one time, so I have
> no idea what's going on here. Could someone explain why this might be
> happening?
>
> Here is the output produced when installing librewolf:
> https://paste.debian.net/1334470/

You pastes have expired; maybe have it inline next time?

‘with-build-handler’ etc. is a mechanism used for grafts and described
in this post:

  https://guix.gnu.org/en/blog/2020/grafts-continued/

In the presence of grafts, the “build handler” may be called several
times, indeed.

Ludo’.