GNU bug report logs - #64735
29.0.92; find invocations are ~15x slower because of ignores

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Message #434 received at 64735 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: luangruo <at> yahoo.com, sbaugh <at> janestreet.com, yantar92 <at> posteo.net,
 64735 <at> debbugs.gnu.org
Subject: Re: bug#64735: 29.0.92; find invocations are ~15x slower because of
 ignores
Date: Wed, 26 Jul 2023 04:56:20 +0300

On 25/07/2023 21:42, Eli Zaretskii wrote:
> Almost no change on Windows:
> 
>    (("built-in" . "Elapsed time: 1.218750s (0.078125s in 5 GCs)")
>     ("with-find" . "Elapsed time: 8.984375s (0.109375s in 7 GCs)")
>     ("with-find-p" . "Elapsed time: 8.718750s (0.046875s in 3 GCs)")
>     ("with-find-sync" . "Elapsed time: 8.921875s (0.046875s in 3 GCs)"))
> 
> I'm beginning to suspect the implementation of pipes (and IPC in
> general).  How else can such slowdown be explained?

Seems so (I'm not well-versed in the lower level details, alas).

Your other idea (spending time in text conversion) also sounds 
plausible, but I don't know whether this much overhead can be explained 
by it. And don't we have to convert any process's output to our internal 
encoding anyway, on any platform?

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