Subject: Re: bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

From: Ihor Radchenko <[email-masked]>
Date: Fri, 21 Jul 2023 12:25:29 +0000

Ihor Radchenko <[email-masked]> writes:

>> Hmm, this would mean to extend the file-name-handler-alist spec. Instead
>> of a regexp to check, we would need to allow a function call or
>> alike. Don't know whether this pays for optimization.
>
> The question is: what is more costly
> (a) matching complex regexp && call function or
> (b) call function (lambda (fn) (when (and foo (match-string- ... fn)) ...))

(benchmark-run-compiled 10000000 (string-match-p (caar file-name-handler-alist) "/path/to/very/deep/file"))
;; => (1.495432981 0 0.0)
(benchmark-run-compiled 10000000 (funcall (lambda (fn) (and nil (string-match-p (caar file-name-handler-alist) fn))) "/path/to/very/deep/file"))
;; => (0.42053276500000003 0 0.0)

Looks like even funcall overheads are not as bad as invoking regexp search.

-- 
Ihor Radchenko // yantar92,
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