[R] cgi/servlets/httpd in R

[Samuelson, Frank*]

Here's a related question:  Do any of the mentioned R-web interfaces
(Rweb, R-Online, CGIwithR, RSPerl) support reusing the same R process,
eliminating the startup overhead?  This would be useful to me as well.

Currently I use such a method on my computing cluster:  All 40 
compute nodes run an R process/compute server that listens at a socket for
any 
connection and subsequent commands from another computer. 
When the master process disconnects, the R processes go back to listening
at the socket.  Connecting to the R compute servers this way
takes < 2 milliseconds rather than the typical ~2 second R startup time.

Thanks for any tips.

-Frank



-----Original Message-----
From: Christian Lederer [mailto:christian.lederer at imse.med.tu-muenchen.de] 
Sent: Thursday, May 06, 2004 10:04 AM
To: r-help at stat.math.ethz.ch
Subject: Re: [R] cgi/servlets/httpd in R



Hi,

if found that the easiest way for me doing CGI with R was
using the RSPerl package. So i could do all the CGI related things
in Perl and call R functions from Perl to do the statistics.
You can get RSPerl from http://www.omegahat.org.

If loading the data each time gives a performance problem,
i guess that you could use RSPerl together with fastcgi,
so the R initialization and loading the data would happen only
once. If you try this, i would be very interrested in your experiences.

The RSPerl package is somewhat outdated, but it worked well together
with R 1.6.0 (i didn't try newer versions).

Christian :-)



David Firth wrote:
> On Wednesday, May 5, 2004, at 18:09 Europe/London, foobar wrote:
> 
>> Hi R-helpers
>>
>> Has anyone had any experience doing CGI or Servlets or using an httpd 
>> server in R?
>>
>>
> 
> yes.  See the R FAQ, section 4.  (Or maybe you already have, in which 
> case I misunderstood the question...)
> 
> Best wishes,
> David
> 
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