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From: "Herman, Géza" <geza.herman@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Strange shell mode performance
Date: Wed, 14 Oct 2020 12:49:06 +0200	[thread overview]
Message-ID: <e1a9c41d-3fd5-07f7-9282-c3529d610d1e@gmail.com> (raw)

Hi all,

I'm experiencing strange shell (comint) mode performance. If I cat a 10 
MB file, it takes 1:20 to cat it. Emacs uses only 30% cpu. But, if I 
press enter after I send the cat command, it speeds up, and it only 
takes 8 sec (emacs cpu usage goes up to 100%).

Same thing: if I execute "seq 100000" in a small emacs window, it takes 
~3 seconds. But, if I press enter after executing seq, it takes only 0.4 
sec (this is not 100% reproducible, sometimes pressing enter doesn't 
make a difference).
(I executed comint-clear-buffer before measurements)

It happens with 26.3 and ~3-week-old master branch as well, without any 
extra config (emacs -Q).

Any ideas what causes this? Would it be possible to always have the 
better performance without needing to press enter?

Thanks,
Geza



             reply	other threads:[~2020-10-14 10:49 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-14 10:49 Herman, Géza [this message]
2020-10-14 17:32 ` Strange shell mode performance Stefan Monnier
2020-10-21  1:27 ` Robert Thorpe
2020-10-21 10:27   ` Herman, Géza

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