[Beowulf] Simple MPI programs hang
wrankin at ee.duke.edu
Thu Mar 20 15:51:54 PDT 2008
On Mar 19, 2008, at 7:31 PM, Gregg Germain wrote:
> Hi everyone,
> I've created a 2 node cluster running FC8. I've installed MPICH2
> 1.0.6pl on both (not NFS'd).
> The Master, Ragnar, is a 64 bit; olaf is a 32 bit.
> I set up the ring, and mpdtrace shows:
> $ mpdtrace -l
> Ragnar_37601 (192.168.0.2)
> olaf_45530 (192.168.0.5)
> I run a VERY simple MPI program and it hangs:
> #include "mpi.h"
> #include <stdio.h>
> #include <math.h>
> #include <string.h>
> int main( int argc, char *argv )
> return 0;
If it's not a 32/64 bit issue (as the other poster mentioned) you
should try putting an MPI_Barrier() call immediately before the
MPI_Finalize(). This will at least make sure that both instances
have made it complete through MPI_Init() before the one or the other
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