Ralph Castain wrote:
On Jan 12, 2011, at 12:54 PM, Tena Sakai wrote:
Hi Siegmar,
Many thanks for your reply.
I have tried man pages you mention, but one hurdle I am running into
is orte_hosts page. I don't find the specification of fields for
the file. I see an example:
dummy1 slots=4
dummy2 slots=4
dummy3 slots=4
dummy4 slots=4
dummy5 slots=4
Is the first field (dummyX) machine/node name?
Yes
What is the definition
of slots? (Max number of processes to spawn?)
Yes
Here we don't let 'slots' exceed the number of physical cores.
(Actually, Torque does this for us.)
I suppose this prevents the cores to be oversubscribed,
at least by default, right?
Gus Correa
Am I missing a different man page? Can you please shed some light?
Thank you.
Tena Sakai
tsa...@gallo.ucsf.edu
On 1/10/11 11:38 PM, "Siegmar Gross" <siegmar.gr...@informatik.hs-fulda.de>
wrote:
Hi,
What I want is to spawn a bunch of R slaves to other machines on
the network. I can spawn R slaves, as many as I like, to the local
machine, but I don t know how to do this with machines on the
network. That s what hosts parameter of mpi.spawn.Rslaves()
enables me to do, I think. If I can do that, then Rmpi has
function(s) to send command to each of the spawned slaves.
My question is how can I get open MPI to give me those hosts
parameters.
I am not quite sure if I understood your question, but when you
read "man MPI_Comm_spawn" you can find the parameter "MPI_Info info"
which allows to specify where and how to start processes. "man
MPI_Info_create" shows you how to create an info object and "man
MPI_Info_set" how to add a key/value pair. "man orte_hosts" shows
you how you can build a hostfile. I do not know how to do these
things in your language R but hopefully the information of the
manual pages helps to solve your problem.
Kind regards
Siegmar
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