From mboxrd@z Thu Jan  1 00:00:00 1970
From: Charles Berry <ccberry@ucsd.edu>
Subject: Re: asynchronous code evaluation
Date: Wed, 4 Sep 2013 16:08:25 +0000 (UTC)
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Johannes Rainer <johannes.rainer <at> gmail.com> writes:

> 
> 
> hi all!
> 
> I have some pretty calculation intense R code in a code block and when I 
> execute the code (C-c C-c) my emacs freezes and waits for the code to 
> finish. Is there a way to evaluate the code asynchronously, so that I 
> could edit the file (obviously not the code block itself) while the code 
> is being evaluated?
> 
> thanks, jo
>

Try this:

C-c ' in the R src block. 

Then use C-c C-c (ess-eval-region-or-function-or-paragraph-and-step) to 
execute the long running code from the ESS edit buffer.

You may need to select the region if there are several paragraphs, or 
delete any blank lines.

==

Another alternative is to use ravel. 

  https://github.com/chasberry/orgmode-accessories

Create a knitr or Sweave doc from the org doc or a suitable subtree of the 
computationally intensive parts. 

Then you can knit() the doc from the R session and switch back to
the buffer you want to edit. Also, you might want to turn on caching in the
knitr doc to enable a quick restart when you log in again.