GNU bug report logs - #66288
29.1; Performance regression using pipe for subprocess

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Package: emacs;

Reported by: Chris Hanson <cph <at> chris-hanson.org>

Date: Sun, 1 Oct 2023 00:59:02 UTC

Severity: normal

Found in version 29.1

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Paul Eggert <eggert <at> cs.ucla.edu>, Eli Zaretskii <eliz <at> gnu.org>, Chris Hanson <cph <at> chris-hanson.org>
Cc: gerd.moellmann <at> gmail.com, 66288 <at> debbugs.gnu.org, gregory <at> heytings.org
Subject: bug#66288: 29.1; Performance regression using pipe for subprocess
Date: Thu, 5 Oct 2023 01:54:43 +0300

On 05/10/2023 01:49, Paul Eggert wrote:
>> +      fcntl (inchannel, F_SETPIPE_SZ, readmax);
> 
> This call can fail if you aren't root and you exceed the system limit in 
> /proc/sys/fs/pipe-max-size. So I suggest that if this fnctl fails with 
> EPERM, trying it again after clipping to that limit.

Perhaps we'd rather fail loudly, so the user is aware that their 
customized value cannot be applied.
This bug report was last modified 1 year and 229 days ago.

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