The issue seems to be that you have probably not created a machinefile which consists of node name to number of processes mapping and this file should be present in the same dir. of the other nodes on which you are launching other MPI processes, this is required in case you want to run the MPI program across the two or more nodes, you can find more details of the format in which this information has to be in the machinefile and the other requisite steps need for running your MPI program across multiple nodes from this link http://wiki.mpich.org/mpich/index.php/Using_the_Hydra_Process_Manager Also, in order to launch the processes across multiple nodes you need to do ssh passwordless login among those nodes, in case you are using ssh as the connection mechanism, you can find more details about the procedure for ssh passwordless login over here http://www.techlitic.com/ssh-passwordless-login.html Regards, Mahesh Doijade, http://www.techdarting.com/ On Tue, Aug 20, 2013 at 8:34 AM, Pavan Balaji <[email protected]> wrote:

I'm pasting the error inline, for others' information.

FYI, the error is "unable to open host file: machinefile".

----8<---- mpirun -f machinefile -n 2 /home/urp/mpich-install/hello [[email protected]] HYDU_parse_hostfile (./utils/args/args.c:323): unable to open host file: machinefile [[email protected]] mfile_fn (./ui/mpich/utils.c:341): error parsing hostfile [[email protected]] match_arg (./utils/args/args.c:153): match handler returned error [[email protected]] HYDU_parse_array (./utils/args/args.c:175): argument matching returned error [[email protected]] parse_args (./ui/mpich/utils.c:1609): error parsing input array [[email protected]] HYD_uii_mpx_get_parameters (./ui/mpich/utils.c:1660): unable to parse user arguments [[email protected]] main (./ui/mpich/mpiexec.c:153): error parsing parameters [root@masternode ~]# ----8<----

On 08/19/2013 01:27 AM, urmila pol wrote:

...

Dear sir,

I have attaching the screenshots of my errors please guide me .waiting for reply.

With regards,

Dr.Urmila R. Pol Assistant Professor, Department of computer Science, Shivaji University, Kolhapur.

-- Pavan Balaji http://www.mcs.anl.gov/~balaji ______________________________**_________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/**mailman/listinfo/discuss<https://lists.mpich.org/mailman/listinfo/discuss>