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Re: CVS emacs is sometimes terribly sluggish


From: Kim F. Storm
Subject: Re: CVS emacs is sometimes terribly sluggish
Date: Fri, 17 Dec 2004 16:56:53 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/21.3.50 (gnu/linux)

Klaus Zeitler <address@hidden> writes:

> Every so often (so far I haven't seen any pattern) CVS emacs becomes really
> slow, even though I'm performing only really simple tasks (entering a few
> characters, switching windows or frames, positioning the pointer, all these
> commands then take a few seconds).  A ps command then shows me that emacs is
> running somewhere between 30% and 50% CPU for no apparent reason. I have a
> sneaking suspicion that it may have to do something with multiple frames. I
> use typically from 3 to 5 or 6 frames and I've noticed that, when I delete all
> frames but one, emacs CPU usage goes down drastically. I'm using emacs under
> Solaris 5.8.
>
> Has anybody seen something similar and how would I go about investigating this
> behavior? 
>

Run emacs under gdb, and break it when it starts use up cpu cycles for
no apparent reason.

Then look at the output of

bt
xbacktrace

If that doesn't give you a clue, try stepping through some code
to see where it is semi-looping.

For more instructions look at etc/DEBUG.

-- 
Kim F. Storm <address@hidden> http://www.cua.dk





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