newbie question on snow/Rmpi
Does anyone know if these errors can be safely ignored? [linuxsvr.kls.corp:16242] mca: base: component_find: unable to open osc pt2pt: file not found (ignored) this is on RHEL5 w/ openMPI 1.2.7 -Whit
On Mon, Dec 15, 2008 at 6:31 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
On Mon, Dec 15, 2008 at 01:16:46PM -0500, Whit Armstrong wrote:
I have a network of four machines set up. I'm having trouble spawning my slaves on these machines. All the examples I have found so far use makeCluster with type="MPI", and I guess I'm missing some kind of cluster configuration in my environment variables because all my clusters are formed on the machine where my initial session is running. Can anyone refer me to a link that illustrates how to set up the environment for MPI (listing node names, number of slots, etc) that will allow the makeCluster command take advantage of the other nodes?
It depends on which MPI library you use. I like Open MPI.
Thanks, Whit simple example: library(Rmpi) library(snow) cl <- makeCluster(2, type = "MPI")
You must call R (or r or Rscript) 'inside' orterun (or mpirun) which allows you to set hostnames on that invocation. See my UseR 2008 tutorial for some examples. Dirk -- Three out of two people have difficulties with fractions.