[MPICH] problems running a program using MPI

[Rajeev Thakur]

Pete Wyckoff has written an mpiexec that you can use with PBS without
running MPD. See http://www.osc.edu/~pw/mpiexec/index.php .

Does the cpi example in the examples directory run? There is another one in
the examples/f90 directory.

Rajeev 

> -----Original Message-----
> From: owner-mpich-discuss at mcs.anl.gov 
> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Michael Baxa
> Sent: Friday, February 22, 2008 11:07 AM
> To: mpich-discuss at mcs.anl.gov
> Subject: [MPICH] problems running a program using MPI
> 
> Hello,
> 
> They may very well be elementary issues, but I have two problems that 
> may or may not be related.  These pertain to a Fortran 90 
> program that 
> is supposed to use multiple nodes on a Torque (PBS) and Maui 
> job queue 
> server
> 
> Problem #1: Before I call my program, I boot mpd with the 
> following:  ` 
> mpdboot --file=$PBS_NODEFILE `
> 
> However, only the first node in $PBS_NODEFILE is booted.  In an 
> interactive session, I try to get around this by ssh'ing to the other 
> nodes in $PBS_NODEFILE and calling ` mpd -h <node1> -p <node1 
> port> `.  
> After doing this, `mpdtrace` returns all of the nodes in 
> $PBS_NODEFILE.  
> I don't know why this isn't done automatically in the first place.
> 
> Problem #2: With mpd now booted on all my nodes, I now call 
> my program 
> using
> 
> `mpirun -machinefile $PBS_NODEFILE -np <number of nodes> <program>`
> 
> The program seems to hang the first time it comes to 
> MPI_BCAST, i.e. for 
> an array named temps, I have the following
> 
>     do i=0,nproc-1
>       print *, 'i = ',i
>       call MPI_BCAST (temps(i), 1, MPI_DOUBLE_PRECISION, i, 
> MPI_COMM_WORLD, ierr)
>     enddo
> 
> The last thing the program outputs is 'i =            0`
> 
> One side note, I put a 'call MPI_BARRIER(MPI_COMM_WORLD,ierr)` before 
> this do loop just to see what would happen, and every node 
> froze at that 
> line.
> 
> I do not know if this is a relevant issue to this forum, but I would 
> greatly appreciate any suggestions.
> 
> Thank you,
> 
> Michael Baxa
> 
> 
> 
> 
>