[R] cgi/servlets/httpd in R
Samuelson, Frank*
FWS4 at CDRH.FDA.GOV
Mon May 10 15:20:55 CEST 2004
Actually, what I have is probably not what you want, and I wrote
it as an example of what I was looking for, and what is probably possible.
My code is just a hack of the snow socket code.
To answer your questions:
1. The communication is done by serializing R objects. That is,
the process connecting to the R compute nodes is an R process as
well. Not helpful in this situation.
2. Again, not what you want. In the cluster every node has 1 R
job, and all get connected simultaneously until
they're done computing, then released simultaneously.
2.5 No, see 1.
3. You may have the code if you want, but like I said, you probably don't.
These recent posts gave some good information though:
https://www.stat.math.ethz.ch/pipermail/r-help/2004-May/049239.html
https://www.stat.math.ethz.ch/pipermail/r-help/2004-May/049321.html
I think RZope/RSOAP and/or Rserve may be what
we're looking for. They're not on CRAN and weren't listed in the faq.
-Frank
-----Original Message-----
From: wwsprague at ucdavis.edu [mailto:wwsprague at ucdavis.edu]
Sent: Friday, May 07, 2004 12:50 PM
To: Samuelson, Frank*
Subject: Re: [R] cgi/servlets/httpd in R
Samuelson, Frank* wrote:
> 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.
Your solution seems what I am looking for, actually. Questions:
1. How do you communicate with an R process? I can only think of
embedded code like SQL in Perl.
2. How do you find an R node that is open?
2.5 You are haveing cgi scripts connect to the R processes, right? Or
are the R processes available for another purpose?
3. How much of your code are you willing to share :)? We are
interested in making demographic analysis tools available online
(life-table-ish stuff to start with, then as much as we can get grant
money for).
W
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