Hello, We have R working with Rmpi/openmpi, but I'm a little worried. Specifically, (a) the -np flag doesn't seem to override the hostfile (it works fine with fortran hello world) and (b) I appear to have twice as many processes running as I think I should.
Rmpi version 0.5.5 Openmpi version 1.1 Viglen HPC with (effectively) 9 blades and 8 nodes on each blade. myhosts file contains details of the 9 blades, but specifies that there are 4 slots on each blade (to make sure I leave room for other users). When running mpirun -bynode -np 2 -hostfile myhosts R --slave --vanilla task_pull.R 1. I get as many R slaves as there slots defined in my myhosts file (there are 36 slots defined, and I get 36 slaves, regardless of the setting of -np, the master goes on the first machine in the myhosts file. 2. The .Rout file confirms that I have 1 comm with 1 master and 36 slaves 3. When I top each blade it indicates that there are in fact 8 processes running on each blade and 4. When I pstree each blade it indicates that there are two orted processes, each with 4 subprocesses. >From the point of view of getting a job done this ***seems*** OK (it's running >very quickly), but it doesn't seem quite right - given I'm sharing the machine >with other users and so on. Is there something I've missed in the useage of >mpirun with R/Rmpi. Many 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.
