Hello, I'm using R on a 10 blade dual quad core Rocks Cluster, and trying to use Rpmi and snow. I basically wondered if at the moment I ought to install Rmpi against another form of mpi (not openmpi) and wondered whether anyone could pass on any experience.
I'm mainly worried about (a) the R server taking up 100% cpu time (I think this is a known issue with Rmpi and openmpi) and (b) checking that my slaves are running on separate nodes rather than all piling onto the same nodes (on the server). Some very crude experiments in snow imply that slave processes might well be getting passed on to separate nodes beyond the server. However, it's a little harder convincing myself which nodes are doing what. When looking directly in Rmpi, lamhosts() reports all the hosts correctly, unfortunately mpi.universe.size reports 1 node (I think this is as documented). More importantly, I have the issue with mpi.spawn.Rslaves() freezing. This has been mentioned before: http://tolstoy.newcastle.edu.au/R/e2/help/07/06/18573.html I wondered if anyone would mind supplying pointers. I'm specifically wondering if I need to check the version of openmpi, and whether at the moment it would be better to use another flavour of mpi. I would be extremely grateful for any advice. Thanks Paul -=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Paul Hewson Lecturer in Statistics University of Plymouth Drake Circus Plymouth PL4 8AA tel ++44(0)1752 232778 email [EMAIL PROTECTED] web http://www.plymouth.ac.uk/staff/phewson ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
