Re: readlink system calls

[Maxime Devos <maximedevos@telenet.be>]

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Op 22-08-2023 om 21:03 schreef Olivier Dion:
> On Tue, 22 Aug 2023, Christopher Baines <mail@cbaines.net> wrote:
>> When looking at strace for various Guile things, I'm seeing a lot of
>> readlink system calls for directories in the load path, e.g.
> 
> Is this not more a side effect of using Guix (the GNU store) than Guile
> itself?

I'm pretty sure that, store or not, there is probably not a good reason 
Guile is 'readlink'-ing the same directories multiple times.  Even if it 
were a side effect of using Guix, it appears to be something that needs 
to be addressed in Guile.

> Any idea what leads to this behaviour?

Hypothesis:

  * Guile is searching for .go/.scm files in the load paths
  * as part of that this process, it readlinks stuff
    (don't know why Guile would need this information though)
  * it doesn't cache any of this readlink information, so if
    you load N .go/.scm files from the same directory, then the
    number of readlink calls is multiplied by N.

Assuming this hypothesis true, a potential solution could be to cache 
the readlink information.  Whether that's a correct solution depends on 
what the purpose of these readlink calls are ...

Best regards,
Maxime.

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