On Mon, 1 Dec 2003, A.J. Rossini wrote:
> Faheem Mitha <[EMAIL PROTECTED]> writes: > > > On Mon, 1 Dec 2003, A.J. Rossini wrote: > > > >> > >> use snow. > >> > >> The general approach highlighted in > >> > >> http://www.analytics.washington.edu/~rossini/courses/cph-statcomp > >> > >> in Lab 4 works with Rmpi as well. > > > > Forgive my cluelessness, but are the slaves spawned by snow R slaves or C > > slaves? I need to work low level with C. > > R slaves. > > If you need to work with C slaves, you need to be pretty careful with > SPRNG. > > Is there a reason you can't use C from R code? If so, you get SPRNG > for free, if not, it's a royal pain. It would be great if I could do it that way. I've used the .C interface to R (for example) for ages. However, I need to parallise the code at the C level, which is where I do nearly all of the heavy lifting. More explicitly, I want the C code to do different things on different processors, pass data back and forth and so on, where everything would be controlled from the R level. My impression is that if I was to use C from R, then the parallelization would only be done at the R level. So, can this (parallelization at the C level) be done without running a bunch of C slaves along the lines I had previously written? Any examples would be helpful. > I'd be careful about SPRNG's MPI code, as well -- works with MPICH, > but it's been touchy with LAM-MPI, at least with the versions (LAM, > MPICH) I've worked with. And versions seem to be somewhat important. Yes, the whole SPRNG thing seems rather difficult. Thanks for your help. Faheem. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help