Bill,
> A rather stable production code that has worked with various versions of MPI
> on various architectures started hanging with gcc-4.4.2 and openmpi 1.3.33
Probably this bug :
https://svn.open-mpi.org/trac/ompi/ticket/2043
Waiting for a correction, try adding this option to mpirun :
-mca btl_sm_num_fifos 5
--Vincent
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