Re: [R] cgi/servlets/httpd in R

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From: Prof Brian Ripley (ripley@stats.ox.ac.uk)
Date: Fri 07 May 2004 - 01:47:43 EST


Message-id: <Pine.LNX.4.44.0405061644470.19271-100000@gannet.stats>

Can I remind people that R will start up very much faster if you don't
need all the standard packages loaded: in particular, in half the time
without methods loaded and in 10% of the time if you only need base.
We hope come 2.0.0 to have halved the existing time by using
load-on-demand of objects.

On Thu, 6 May 2004, David Firth wrote:

> On Thursday, May 6, 2004, at 16:01 Europe/London, Samuelson, Frank*
> wrote:
>
> > 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.
> >
> >
>
> I only know about CGIwithR, which is very simple and starts a new R for
> every request. Startup time on my Mac is around 1.3 seconds; for my
> own purposes this is absolutely fine, but I can appreciate that it
> could well be problematic in certain kinds of application (eg where a
> very large amount of data has to be loaded).

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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