GNU bug report logs - #895
slow processing of process output

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Package: emacs;

Reported by: Dan Nicolaescu <dann <at> ics.uci.edu>

Date: Fri, 5 Sep 2008 15:50:04 UTC

Severity: normal

Done: Noam Postavsky <npostavs <at> users.sourceforge.net>

Bug is archived. No further changes may be made.

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Message #15 received at 895 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Markus Triska <markus.triska <at> gmx.at>
To: 895 <at> debbugs.gnu.org
Cc: Dan Nicolaescu <dann <at> ics.uci.edu>
Subject: Re: slow processing of process output
Date: Sun, 01 Mar 2009 15:33:14 +0100

I can reproduce the problem on OSX, and could significantly improve the
running time by setting process-connection-type to nil before doing the
rgrep. Let rgrep.el consist of:

   (grep-compute-defaults)
   (setq process-connection-type nil)
   (rgrep "emacs" "*.el" "~/emacs/lisp/")

   (while (process-status "grep")
     (sit-for 0.1))

and do:

   $ time emacs -Q --script rgrep.el

Then contrast this with retaining t for process-connection-type.

I have seen that using a pty can be a major performance problem also
when communicating with other external programs, and I recommend to
let-bind it to nil before starting the process when a pipe suffices.
This bug report was last modified 8 years and 347 days ago.

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