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[O] Performance issues after upgrading from Emacs 23.3 to 24.3+prelude
From: |
Karl Voit |
Subject: |
[O] Performance issues after upgrading from Emacs 23.3 to 24.3+prelude |
Date: |
Mon, 6 Jan 2014 17:54:50 +0100 |
User-agent: |
slrn/0.9.9 (Linux) |
Hi!
I have got very severe performance issues after I upgraded my Emacs.
Before upgrading:
- Debian stable x64
- Emacs 23.3 (Debian stable deb-package)
- Org-mode from git: version 8.2.3c (release_8.2.3c-225-g668ba5)
- no prelude
Now:
- Debian stable x64
- no change but I replaced Debian Emacs packages with
Emacs-snapshot and MELPA/Marmelade
- Emacs-snapshot 24.3.50.1 from [1]
- Org-mode from git: version 8.2.3c (release_8.2.3c-225-g668ba5)
- no change
- Emacs prelude from [2]
I mainly use Emacs for Org-mode and therefore I got issues only in
Org-mode. Some tasks are very slow and take 100% of a CPU core. This
is the rare occasion where I am happy that Emacs is single-threaded
:-)
Further down, there are three examples with their profiling results.
I don't know how to interpret the profiling results properly.
Most annoying: sometimes, Emacs starts using up its CPU core at 100%
without any particular reason or event I am aware of. Probably it is
while auto-saving (not every time!) but I am not sure.
I have no idea on how to debug this behavior because when Emacs is
blocking completely, it is not even updating its buffer display nor
reacting on C-g or similar. However, I am able to kill (with default
kill signal) the Emacs process without leaving unsaved buffers.
I guess that with Emacs prelude, I got some functionality which is
causing these issues. So this might be of interest of other
Emacs/prelude users as well.
* Example 1: moving an item in a list up/down
I just switch two lines of a simple list by invoking M-<up>:
- foo
- bar
- baz (is moved one line up)
This took only a fraction of a second before. Now I ave to wait
approx. 2-3 seconds.
I learned how to use the Emacs profiler and generated a CPU-report
when invoking the command: [3]
Interestingly, when I am using M-x org-move-item-up, it does not
show the slow-down effect.
* Example 2: M-<up> on a heading containing 20000 lines of
appointments and notes
This task took almost two minutes. Before the update, this was
probably done in a couple of seconds.
Here is the CPU-report of the profiler: [4]
* Example 3: Re-calculating and formatting of a 10x10 table
The table has 10x10 cells and four very simple formulas. The
operation took approx. 1-3s before the update. Now, it takes over
four minutes.
The command invoked was: C-u C-u C-c C-c
CPU-profiling report: [5]
1. http://emacs.naquadah.org/
2. git://github.com/bbatsov/prelude.git
3. http://pastebin.com/mQRDYbq7 -> M-<up> on a list item
4. http://pastebin.com/P2sJPsHy -> moving large heading
5. http://pastebin.com/3Kw6knYU -> re-calculating table
--
mail|git|SVN|photos|postings|SMS|phonecalls|RSS|CSV|XML to Org-mode:
> get Memacs from https://github.com/novoid/Memacs <
https://github.com/novoid/extract_pdf_annotations_to_orgmode + more on github
- [O] Performance issues after upgrading from Emacs 23.3 to 24.3+prelude,
Karl Voit <=