GNU bug report logs - #50755
[PATCH] import: Generate list of importers based on available modules

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From: pinoaffe <pinoaffe <at> airmail.cc>
To: Maxime Devos <maximedevos <at> telenet.be>
Cc: 50755 <at> debbugs.gnu.org, zimoun <zimon.toutoune <at> gmail.com>
Subject: [bug#50755] [PATCH v3] import: Generate list of importers based on available modules
Date: Tue, 28 Sep 2021 16:39:16 +0200

Hi, 

Maxime Devos writes:
> To only measure the time required for defiing 'importers', wrap
> delete-duplicates in a call to 'time' from (ice-9 time).

Running

(time (for-each (lambda (_)
                  (delete-duplicates (filter-map (lambda (module)
                    (match (module-name module)
                           (`(guix scripts import ,importer)
                            (symbol->string importer))
                            (#t #f)))
                    (all-modules (map (lambda (entry)
                                   `(,entry . "guix/scripts/import"))
                                   %load-path)))))
                (iota 1000)))

in a guix repl on my system results in

clock utime stime cutime cstime gctime
 0.96  1.67  0.07   0.00   0.00   1.19

If I'm interpreting that correctly that would amount to a couple of
thousands of a second per run

Kind regards,
pinoaffe

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