El mar, 26 ago 2014, Richard Lawrence decía:

> Hi all,
> 
> I pulled from master recently (for the first time since the spring), and
> since the update, I have noticed a performance/lockup issue.  The
> problem occurs when exporting an agenda view to iCalendar format.
> 
> My Emacs version is 23.4.1 and my Org version is "8.3beta" (I am
> currently on commit 767895...)
>  
> I have traced the problem down to a call to
> `org-icalendar-export-current-agenda', though I don't know if the
> problem is in this function or in another function called by it.
> Somewhere during the execution of this function, Emacs goes to 100% CPU
> usage (on one core) and memory usage starts growing until I kill the
> process.
>  
> Here's what my setup looks like.  I have just one entry in
> `org-agenda-custom-commands' that defines the files field.  It looks
> like:
> 
>  ("Z" "Export to iCalendar file" tags "+event|+appointment" nil
>   ("~/Documents/website/public_html/lib/attachments/calendar.ics")
> 
> I normally only call this command via a cron job that exports my agenda
> files to .ics, which until recently was working fine.  But I have
> noticed I can reproduce the lockup interactively by building an agenda
> view with this command, and then calling
> `org-icalendar-export-current-agenda' on it (which is also what happens,
> a few steps down the call chain, during the cron job).
> 
> I have run some tests by manually setting org-agenda-files, then
> building this agenda and eval'ing
> 
> (org-icalendar-export-current-agenda "/tmp/agenda.ics") 
> 
> in the agenda buffer.  The results:
> 
> 1) Using just a simple three-entry test file, the export completes quickly
>    and I don't see the lockup.  
> 2) Using an agenda file which contains plenty of real data
>    (about 1000 lines) but no headlines tagged "event" or "appointment"
>    (i.e., a file for which this agenda view is empty), the call to
>    `org-icalendar-export-current-agenda' takes about 5 seconds to
>    complete, even though there are no entries to export.  During those
>    5 seconds, the Emacs process goes to 100% CPU usage.
> 3) Using a different agenda file (of about 4000 lines) which contains
>    about 75 matching headlines, the call to
>    `org-icalendar-export-current-agenda' does not complete within
>    several minutes, during which time I see 100% CPU usage and rapid
>    memory usage growth.  
> 
> So it looks to me like maybe some part of the export process uses
> exponentially more time and memory, depending on the input, since a
> minimal test case does not produce the problem.
>
> What's the next step for debugging this?  Please let me know if I can
> provide more information.  
> 
> Thanks! 
> 
> -- 
> Best,
> Richard

I use a bash script: =agenda-ascii= [0] to
reduce the list of file to export, first =grep=
current =<year-month= pattern in the *.org
files:

  #+BEGIN_EXAMPLE
    ORG_FILES=$($GREP -l "<$YEAR-$MONTH" *.org)
    echo $ORG_FILES

    if [ "$EXPORT_ICS" = "TRUE" ]
    then
        for AGENDA in $(echo $ORG_FILES)
        do
            echo EXPORT $AGENDA ...
            ARCHIVO=$DIR/$AGENDA
            $EMACS --batch -q --directory=${DIR} --visit=${ARCHIVO} --eval '(org-export-icalendar-this-file)' >/dev/null 2&>1
        done
    fi
  #+END_EXAMPLE

Actually the process, cosume 42%-97% CPU, for
526 appoinments, takes 0m 30.396s

  Org-mode version 8.3beta (release_8.3beta-264-g7a5f3f
  GNU Emacs 24.3.1 (x86_64-pc-linux-gnu) of 2014-06-06 on barber, modified by Debian


[0] https://github.com/osiris/org-bash-utils/blob/master/agenda-ascii

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