25.4 Emacs Using 100% CPU
Historic This seems to be a problem with emacs recently (late 2006 and into 2007). I eventually tracked down a solution that seems to fix emacs-snapshot on Debian, from http://forums.gentoo.org/viewtopic-t-501837-highlight-emacs+cpu.html. I followed the instructions but it started happening again, probably because the source code for the fix (as detailed below) is in a couple of places.
A quick fix is to set the Emacs variable
semantic-idle-scheduler-idle-time to a large number (by
default it is 2 seconds) so that the idle scheduler does not kick in
(which is what is using all the CPU)!
The actual solution below edits the file
ensures all binary copies of it are replaced (including, for me,
did not seem to have a source version).
So, first edit the file
comment out line 290:
Similarly, comment out line 294, but be sure to retain the final three closing braces:
Next, start up, as root, a new emacs and byte compile the package:
$ sudo emacs -nw -q M-x byte-compile-file <ret> /usr/share/emacs/site-lisp/semantic/semantic-idle.el C-x C-c
As mentioned above, copy the byte copmiled version across to
Now start up Emacs and hopefully it won’t consume all the CPU again!
Edward Garson reports (28 Apr 2007) that the same fix works for XP and Fedora 6.
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