> From: Bill Broadley <b...@broadley.org> > I've minimal experience with Rmpi. But sub 2us MPI wasn't hard even 7 > years ago. Trying to do app -> mmap -> nfs client -> nfs server -> nfs > client -> mmap and I'd be impressed with sub 2ms (a factor of 1000 > slower). Does RMPI do anything stupid like assume TCP over ethernet?
As I mentioned, I'm willing to give up some performance for portability. We're not talking about Infiniband here. The primary use of Rdsm is for multicore machines, not clusters, but I wish to have some usability on cluster platforms, on which at least large-granularity problems should work OK. In the parallel processing world, there is always a tradeoff between performance and convenience. If convenience were not an issue, then no one would even attempt to do parallel code in R or Python; we'd write all our code in assembly language. :-) Rmpi uses whatever MPI gives it. If you have MPI configured in whatever specialized way, Rmpi uses it. Norm _______________________________________________ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
