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The problem is that MPI_SEND blocks forever (the message is still not
delivered after many hours).
attached mail follows:
My program runs fine with openmpi-1.0.1 when run from the command line
(5 processes with empty host file), but when I schedule it with qsub to
run on 2 nodes it blocks on MPI_SEND
(gdb) info stack
#0 0x00000034db30c441 in __libc_sigaction () from
#1 0x0000000000573002 in opal_evsignal_recalc ()
#2 0x0000000000582a3c in poll_dispatch ()
#3 0x00000000005729f2 in opal_event_loop ()
#4 0x0000000000577e68 in opal_progress ()
#5 0x00000000004eed4a in mca_pml_ob1_send ()
#6 0x000000000049abdd in PMPI_Send ()
#7 0x0000000000499dc0 in pmpi_send__ ()
#8 0x000000000042d5d8 in MAIN__ () at main.f:90
#9 0x00000000005877de in main (argc=Variable "argc" is not available.