emacs 22.1 hogging CPU

emacs 22.1 hogging CPU

[David L]

I started emacs like this:
        emacs  -l shared/sw/gvu/src/../bin/fc6debug1_1t/gtkview.nep2 -f 
nep-build-and-load-tags -title "fc6debug1_1t gtkview"

For several minutes after I started it, emacs was using between 10%
and 40% of a 3GHz P4.  This problem is either new with the 22.1
release or is much worse now.  I don't know how to profile emacs
to tell what's using the CPU, but emacs appears to be doing nothing
at the time except waiting for user input... the building and loading
of etags had long since finished.


The contents of the gtkview.nep2 file looked like this:
(defconst nep-project-name "shared/sw/gvu/bin/fc6debug1_1t/gtkview.nep"
  "Define the full name of this project file relative to the CVS root 
level")
(defconst nep-build-dir "shared/sw/gvu/src"
  "Defines the build directory relative to the CVS root level")
(defconst nep-bin-dir "shared/sw/gvu/src/../bin"
  "Defines the bin directory relative to the CVS root level")
(defconst nep-exec-root "gtkview"
  "Defines the DL-style executable root name")
(defconst nep-build-script "./buildgtkview"
  "Defines the DL-style buildscript")
(defconst nep-build-target "fc6debug1_1t"
  "Defines the DL-style target")
(defun nep-debug-project ()
(interactive)
(gdb "gdb -cd=/projects/ct/team/dl/tim/svncvs/trunk/shared/sw/gvu/src 
--annotate=3 
/projects/ct/team/dl/tim/svncvs/trunk/shared/sw/gvu/src/../bin/fc6debug1_1t/gtkview"))
(defconst nep-tags-file-name  
"/projects/ct/team/dl/tim/svncvs/trunk/shared/sw/gvu/src/../bin/fc6debug1_1t/gtkview.etags")
  (defconst nep-cvsrootlevel "/projects/ct/team/dl/tim/svncvs/trunk")
  (defconst nep-current-project 
"/projects/ct/team/dl/tim/svncvs/trunk/shared/sw/gvu/src/../bin/fc6debug1_1t/gtkview.el")
  (defconst nep-current-project-makefile 
"shared/sw/gvu/src/makefile.gtkview")


The function nep-build-and-load-tags looks like this:
;; function called when using the "emacs" target
(defun nep-build-and-load-tags ()
  (add-hook 'compilation-finish-functions 'nep-load-tags-after-compile)
  (nep-build-etags)
  (visit-tags-table nep-tags-file-name)
  (find-tag "main")
)

The function nep-build-etags looks like this:
(defun nep-build-etags ()
  (interactive)
  (compile (concat "cd " nep-cvsrootlevel "/"
                   nep-build-dir "; "
                   nep-build-script " "
                   nep-build-target " etags"))
  )


The problem seems to be intermittent.


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/share/emacs/22.1/etc/DEBUG for instructions.


In GNU Emacs 22.1.1 (i686-pc-linux-gnu, GTK+ Version 2.10.8)
of 2007-06-18 on chewbacca.x.com
Windowing system distributor `The X.Org Foundation', version 11.0.70101000
configured using `configure  '--with-x-toolkit=gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: C++/l

Minor modes in effect:
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t
  abbrev-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <menu-bar> <help-menu> <report-emacs-b
ug>

Recent messages:
Loading cc-mode...done
Loading /home/dl/ecb/semantic-1.4.4/semantic-c.el (source)...done
Loading vc-svn...done
Loading vc...done
Mark set
(iconify-frame (#<frame emacs@chewbacca.x.com 0x85f0e28>))
(make-frame-visible (#<frame emacs@chewbacca.x.com 0x85f0e28>))
(iconify-frame (#<frame emacs@chewbacca.x.com 0x85f0e28>))
(make-frame-visible (#<frame emacs@chewbacca.x.com 0x85f0e28>))
Loading emacsbug...done

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Re: emacs 22.1 hogging CPU

[David L]

>I started emacs like this:
>emacs -l shared/sw/gvu/src/../bin/fc6debug1_1t/gtkview.nep2 -f 
>nep-build-and-load-tags -title >"fc6debug1_1t gtkview"
>
>For several minutes after I started it, emacs was using between 10%
>and 40% of a 3GHz P4.  This problem is either new with the 22.1
>release or is much worse now.  I don't know how to profile emacs
>to tell what's using the CPU, but emacs appears to be doing nothing
>at the time except waiting for user input... the building and loading
>of etags had long since finished.


emacs is now using 98.1% of a P4 3GHz while apparently doing
nothing.  It is continuously using more than 50%.
Here's the output of top:
26022 rmel  39  19  104m  37m  10m R 98.1  1.9  51:01.88 emacs

One of my co-workers is logged into my machine running emacs and
it is his session that is hogging the CPU.  I just went and talked to him
and he wasn't doing anything in that session.  He had left the emacs
code browser open, so I asked him to deactivate it to see if that would
make the problem go away.  It did not.  Is there a way to get emacs to
profile itself while this problem is happening so I can provide some
more useful debugging info?

Thanks,
           David

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Re: emacs 22.1 hogging CPU

[Jason Rumney]

David L wrote:
> One of my co-workers is logged into my machine running emacs and
> it is his session that is hogging the CPU.

Is your co-worker using an old version of semantic?

Re: emacs 22.1 hogging CPU

[David L]

>David L wrote:
> > One of my co-workers is logged into my machine running emacs and
> > it is his session that is hogging the CPU.
>
>Is your co-worker using an old version of semantic?
>

semantic-version is a variable defined in `semantic.el'.
Its value is "2.0pre3"

It looks like there was a pre4 that came out a few days
after emacs 22.1.  I'll try having him upgrade to that.

Thanks,

David

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solved: Re: emacs 22.1 hogging CPU

[David L]

>David L wrote:
> > One of my co-workers is logged into my machine running emacs and
> > it is his session that is hogging the CPU.
>
>Is your co-worker using an old version of semantic?

Although I don't have enough statistics to say for sure,
changing from cedet 1.0pre3 to pre4 seems to have
fixed the emacs CPU hogging problem.  Thanks for
the feedback.  If I see the problem again, I'll follow
up again after running gdb on emacs as RMS
suggested.

Thanks,

          David

PS - Sorry if this was not the appropriate mailing
list to report this problem.

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