[ESS] any way to speed up Emacs\ESS?

[Martin Maechler]

>>>>> "DeepS" == Deepayan Sarkar <deepayan.sarkar at gmail.com>
>>>>>     on Mon, 16 Feb 2009 09:42:20 -0800 writes:

    DeepS> On 2/16/09, Martin Maechler <maechler at stat.math.ethz.ch> wrote:
    >> 
    KDH> Put               (setq ess-eval-visibly-p nil)
    KDH> in your .emacs for
    KDH> letting this be the default behaviour
    >> 
    >> exactly.  We have used this as our stats "department" default
    >> forever.
    >> 
    >> The only (?) reasons it's not the default in ESS are
    >> 
    >> - because the "visibility-turned-on" option is more intuitive to
    >> beginning users of ESS

    DeepS> And when giving live R demos in presentations...

good point.

    >> - to remain compatible to all previous versions of ESS

    DeepS> I'm curious: does anyone know why things are slow with visibility
    DeepS> turned on? It's presumably a emacs22 issue, because there were no
    DeepS> speed issues in emacs21

You are right.  I forgot about that (I've practically never seen
the speed problems, as I practically never use "the
visibility"), and AFAIK all other ESS-corers have forgotten as
well, or not found the time to follow up.

Help from ESS-helpers is very much appreciated.

    DeepS> As an aside, I tried defining a (crude) alternative to ess-eval-region
    DeepS> that loops through a region calling ess-eval-line-and-step (which has
    DeepS> no speed penalty even with visibility):

    DeepS> (defun myess-eval-region (start end)
    DeepS> "Call ess-eval-line for each line overlapping region. "
    DeepS> (interactive "r")
    DeepS> (ess-force-buffer-current "Process to load into: ")
    DeepS> (message "Starting evaluation... %s %s %s" start end (point))
    DeepS> (goto-char start)
    DeepS> (comint-bol)
    DeepS> (while (< (point) end)
    DeepS> (ess-eval-line-and-step)))


    DeepS> Unfortunately, this seems to echo the whole region first, and then
    DeepS> shows the results. Is there a simple way to force updating after each
    DeepS> call? Inserting a call to (sleep-for) seems to work, but surely there
    DeepS> is a better way:

probably, but all this looks like "horrible hack" / "workaround"
and should really not be needed.

Also, I've quickly looked at my (Ubuntu 8.10) version of
emacs-snapshot.
There, I get the impression that
       comint-scroll-to-bottom-on-output which is an alias for
       comint-move-point-for-output
also does not work. If I set it to 't',  the *R* is still not
auto-scrolled when I send R code to the buffer.

.... arrrgh...


    DeepS> (defun myess-eval-region (start end)
    DeepS> "Call ess-eval-line for each line overlapping region. "
    DeepS> (interactive "r")
    DeepS> (ess-force-buffer-current "Process to load into: ")
    DeepS> (message "Starting evaluation... %s %s %s" start end (point))
    DeepS> (goto-char start)
    DeepS> (comint-bol)
    DeepS> (while (< (point) end)
    DeepS> (progn
    DeepS> (ess-eval-line-and-step)
    DeepS> (sleep-for 0.001))))

    DeepS> -Deepayan

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