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
