GNU bug report logs - #18626
24.3.94; communication with subprocess is slow

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 18626 <at> debbugs.gnu.org, stephen_leake <at> stephe-leake.org
Subject: bug#18626: 24.3.94; communication with subprocess is slow
Date: Sun, 05 Oct 2014 05:46:12 +0300

> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Cc: Stephen Leake <stephen_leake <at> stephe-leake.org>,  18626 <at> debbugs.gnu.org
> Date: Sat, 04 Oct 2014 18:29:42 -0400
> 
> > Anyway, for 24.4 all I can suggest is a variable to replace the fixed
> > 20 msec value.
> 
> But why is this needed in 24.4?  What has changed w.r.t 24.3?

Unlike in 24.3, we now set the write end of the pipe to be in no-wait
mode, and use the EWOULDBLOCK machinery in send_process to send large
amounts of material down the pipe.  This evidently makes the writing
slower.

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