So are you trying to start an mpi job that one process is one executable
and the other process(es) are something else? If so, you probably want
to use a multiple app context. If you look at FAQ question 7. How do I
run an MPMD MPI Job at http://www.open-mpi.org/faq/?category=running
this should answer your question below I believe.
--td
On 01/11/2011 01:06 AM, Tena Sakai wrote:
Hi,
Thanks for your reply.
I am afraid your terse response doesn’t shed much light. What I need
is “hosts”
parameter I can use to mpi.spawn.Rslaves() function. Can you explain
or better
yet give an example as to how I can get this via mpirun?
Looking at mpirun man page, I found an example:
mpirun –H aa,aa,bb ./a.out
and similar ones. But they all execute a program (like a.out above).
That’’s not
what I want. 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.
Can you please help me?
Thank you in advance.
Tena Sakai
tsa...@gallo.ucsf.edu
On 1/10/11 8:14 PM, "pooja varshneya" <pooja.varshn...@gmail.com> wrote:
You can use mpirun.
On Mon, Jan 10, 2011 at 8:04 PM, Tena Sakai
<tsa...@gallo.ucsf.edu> wrote:
Hi,
I am an mpi newbie. My open MPI is v 1.4.3, which I compiled
on a linux machine.
I am using a language called R, which has an mpi
interface/package.
It appears that it is happy, on the surface, with the open MPI
I installed.
There is an R function called mpi.spawn.Rslaves(). An argument to
this function is nslaves. I can issue, for example,
mpi.spawn.Rslaves( nslaves=20 )
And it spawns 20 slave processes. The trouble is that it is
all on the
same node as that of the master. I want, instead, these 20
(or more)
slaves spawned on other machines on the network.
It so happens the mpi.spawn.Rslaves() has an extra argument called
hosts. Here’s the definition of hosts from the api document:
“NULL or
LAM node numbers to specify where R slaves to be spawned.” I have
no idea what LAM node is, but there is a funciton called
lamhosts().
which returns a bit verbose message:
It seems that there is no lamd running on the host
compute-0-0.local.
This indicates that the LAM/MPI runtime environment is not
operating.
The LAM/MPI runtime environment is necessary for the
"lamnodes" command.
Please run the "lamboot" command the start the LAM/MPI runtime
environment. See the LAM/MPI documentation for how to invoke
"lamboot" across multiple machines.
Here’s my question. Is there such command as lamboot in open
MPI 1.4.3?
Or am I using a wrong mpi software? In a FAQ I read that
there are other
MPI software (FT-mpi, LA-mpi, LAM-mpi), but I had notion that
open MPI
is to have functionalities of all. Is this a wrong impression?
Thank you for your help.
Tena Sakai
tsa...@gallo.ucsf.edu <http://tsa...@gallo.ucsf.edu>
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