bug#20134: Acknowledgement (24.4.90; Emacs slowdown to eventual hang)

[Phillip Lord]

Eli Zaretskii <eliz@gnu.org> writes:
>> From: phillip.lord@newcastle.ac.uk (Phillip Lord)
>> Date: Tue, 07 Apr 2015 15:38:42 +0100
>> 
>> > I don't understand how could the slow-down happen here, at least not
>> > due to something Emacs does.  Can you collect thread-level CPU usage,
>> > and see which threads are using CPU?
>> 
>> How do I go about this?
>
> Pressing 'H' in 'top' is one way; there might be others.


I will add this tomorrow. It takes a while to produce the crash.

>> > What about timers -- do you have many of them running?  What is the
>> > value of timer-list and timer-idle-list?
>> 
>> A few, indeed, but not thousands. I know how to debug timers but not
>> work out if one is chewing CPU. Some of them my own timers.
>
> When Emacs becomes sluggish, does pressing and holding an arrow key
> produces a slow response time for the first keypress, followed by more
> or less normal response times for the next keypresses?

Nope. The lag is general. If I carry one for long enough, emacs hangs
totally, but Emacs because unusable long before that point.

> If so, the
> culprit is probably some idle timer.  If all the keypresses get the
> same slow response, then it could be a non-idle timer.
>
> Showing a list of the timers you have might be a first step towards
> digging into this possibility.


timer-list is a variable defined in `C source code'.
Its value is
([nil 21795 62426 202965 60 ac-clear-variables-every-minute nil nil 1000])

timer-idle-list is a variable defined in `C source code'.
Its value is shown below.

Documentation:
List of active idle-time timers in order of increasing time.

Value: ([t 0 0 500000 t jit-lock-context-fontify nil idle 0]
 [t 0 0 500000 t
    #[0 "\205\301 \207"
        [eldoc-mode eldoc-print-current-symbol-info]
        1 "\n\n(fn)"]
    nil idle 0]
 [nil 0 1 0 t pabbrev-short-idle-timer nil idle 0]
 [nil 0 1 200000 t reftex-view-crossref-when-idle nil idle 0]
 [nil 0 5 0 t pabbrev-idle-timer-function nil idle 0]
 [nil 0 30 0 nil desktop-auto-save nil idle 0]
 [nil 0 60 0 t bibtex-parse-buffers-stealthily nil idle 0])

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