Hi Ankush
If I remember right,
mpirun will put you on your home directory, not on /tmp,
when it starts your ssh session.
To run on /tmp (or on /mnt/nfs)
you may need to use "-path" option.
Likewise, you may want to give mpirun a list of hosts (-host option)
or a hostfile (-hostfile option), to specify where you want the
program to run.
Do
"/full/path/to/openmpi/mpriun -help"
for details.
Make sure your NFS export/mount of /tmp is working,
say, by doing:
ssh slave_node 'hostname; ls /tmp; ls /mnt/nfs'
or similar, and see if your program "pi" is really there (and where).
Actually, it may be confusing to export /tmp, as it is part
of the basic Linux directory tree,
which is the reason why you mounted it on /mnt/nfs.
You may want to choose to export/mount
a directory that is not so generic as /tmp,
so that you can use a consistent name on both computers.
For instance, you can create a /my_export or /work directory
(or whatever name you prefer) on the master node,
export it to the slave node, mount it on the slave node
with the same name/mountpoint, and use it for your MPI work.
I hope this helps.
Gus Correa
---------------------------------------------------------------------
Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
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Ankush Kaul wrote:
Thank you sir,
one more thing i am confused about, suppose i have 2 run a 'pi' program
using open mpi, where do i place the program?
currently i have placed it in /tmp folder on de master node. this /tmp
folder is mounted on /mnt/nfs of the compute node.
i run de progam from the tmp folder on de master node, is this correct?
i m a newbie n really need some help, thanks in advance
On Mon, Apr 6, 2009 at 8:43 PM, John Hearns <hear...@googlemail.com
<mailto:hear...@googlemail.com>> wrote:
2009/4/6 Ankush Kaul <ankush.rk...@gmail.com
<mailto:ankush.rk...@gmail.com>>:
>> Also how do i come to know that the program is using resources
of both the
> nodes?
Log into the second node before you start the program.
Run 'top'
Seriously - top is a very, very useful utility.
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