[Rd] How to execute R scripts simultaneously from multiple threads

[Erik van Zijst]

Jeffrey Horner wrote:
> I haven't looked at RServe in awhile, but I think that it fires up an R 
> interpreter in response to a client request and then sticks around for 
> the same client to serve it additional requests. The question is how 
> does it manage all the R interpreters with varying demand.
> 
> This issue is solved when you embed R into Apache (using the prefork 
> MPM), as the pool of apache child processes (each with their own R 
> interpreter) expands and contracts on demand. Using this with the 
> loopback device would be a nice solution:

We've looked at RApache as well. It offers a nice pooling solution quite 
in line with Apache's own runtime.
We'd certainly need pooling for our solution as we can't afford a fork 
for each evaluation. Luckily, as you mentioned already, this is fairly 
easy when using RServe as well. If you keep the connection to an 
R-process open, it stays alive. We'd do the actual pooling mechanism 
ourselves.

Erik
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