Re: babel, executing code in background process

[Yu <yu_icq@gmx.at>]

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 Hello!

The trick would be in setting up the post-execution code block handling
> (namely results parsing and insertion) to run after external evaluation
> has completed.

I don't think this is a high priority necessarily. When executing e.g.
gnuplot or octave source code blocks for the sake of plotting, I'm usually
interested in runtime feedback more than collecting the text afterwards.
When doing notebook-Style work, also something like

  : #+begin_src octave :session *foo* :results silent
<<asynchronous-header>>
  :   <<Calculate data>>
  : #+end_src
  : #+begin_src octave :session *foo* :results value <<synchronous-header>>
  :    <<Return data>>
  : #+end_src

would be possible, though of course no convenient solution. My current
solution for long-running octave scripts isn't any more convenient though:
Define the task as functions and then switch to the session buffer manually
and run those interactively.

kind regards, Yu


2012/3/2 Eric Schulte <eric.schulte@gmx.com>

> Erik Garrison <erik.garrison@gmail.com> writes:
>
> > Hi Eric,
> >
> > Thanks for the background.  It looks like ob-screen may be very limited
> in
> > that it doesn't
> >
> > It seems to me that a decent method would behave similarly to the way to
> > "M-x compile" works--- another buffer opens in which the compilation
> > progresses.  Is there any reason why this might not be applicable to the
> > way babel works?
> >
>
> The approach you describe above (a process buffer with a filter) would
> be one viable approach, perhaps even something as simple as using
> `async-shell-command' would be workable.  One place to start looking
> would be in ob-eval.el for external evaluation and ob-comint for session
> based evaluation.
>
> The trick would be in setting up the post-execution code block handling
> (namely results parsing and insertion) to run after external evaluation
> has completed.
>
> If anyone wants to look into the code and write/propose a way forward
> I'm happy to help in any way I can.
>
> Cheers,
>
> >
> > Erik
> >
> > On Wed, Feb 29, 2012 at 5:55 PM, Eric Schulte <eric.schulte@gmx.com>
> wrote:
> >
> >> Hi Erik,
> >>
> >> Currently there is not (to my knowledge) any support for asynchronous
> >> code block evaluation.  The one possible exception could be ob-screen
> >> which I mention only because I don't really know anything about it.
> >>
> >> This would certainly be a worthwhile feature to add to Org-mode code
> >> blocks, however a good implementation (easy to use, robust and
> >> cross-language) will be non-trivial to implement.
> >>
> >> Best,
> >>
> >> Erik Garrison <erik.garrison@gmail.com> writes:
> >>
> >> > Hi,
> >> >
> >> > I'm just starting to use org-mode and babel to structure exploratory
> data
> >> > analysis which I do for my work.
> >> >
> >> > One issue that I've run into is that many of the queries I have to
> issue
> >> > will take a very long time to complete.
> >> >
> >> > Is there any method I could use to execute them in a background
> process?
> >> >
> >> > Thanks,
> >> > Erik
> >>
> >> --
> >> Eric Schulte
> >> http://cs.unm.edu/~eschulte/
> >>
>
> --
> Eric Schulte
> http://cs.unm.edu/~eschulte/
>
>

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