HP-MPI User's Guide (11th Edition)

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Frequently asked questions

Network specific

Appendix D304

Network specific

QUESTION: What extra software do I need to allow HP-MPI to run on my

InfiniBand hardware?

ANSWER

: On HP-UX, download the IB4X-00 driver from the software

depot at http://www.hp.com/go/softwaredepot. Configure

/etc/privgroup. (See “ITAPI” on page 90). Otherwise, consult your

interconnect vendor.

QUESTION: I get an error when I run my 32-bit executable on my AMD64 or

Intel(R)64 system.

dlopen for MPI_ICLIB_IBV__IBV_MAIN could not open libs in list

libibverbs.so:

libibverbs.so: cannot open shared object file: No such file or

directory

x: Rank 0:1: MPI_Init: ibv_resolve_entrypoints() failed

x: Rank 0:1: MPI_Init: Can't initialize RDMA device

x: Rank 0:1: MPI_Init: MPI BUG: Cannot initialize RDMA protocol

MPI Application

rank 0 exited before MPI_Init() with status 1 MPI Application

rank 1 exited before MPI_Init() with status 1

ANSWER: Note that not all messages that say "Can’t initialize RDMA

device" are caused by this problem. This message can show up when

running a 32-bit executable on a 64-bit Linux machine. The 64-bit

daemon used by HP-MPI cannot determine the bitness of the executable

and thereby uses incomplete information to determine the availability of

high performance interconnects. To work around the problem, use flags

(-TCP, -VAPI, etc.) to explicitly specify the network to use. Or, with

HP-MPI 2.1.1 and later, use the -mpi32 flag to mpirun.

QUESTION: Where does HP-MPI look for the shared libraries for the

high-performance networks it supports?

ANSWER:

For detailed information on high-performance networks, see

“Interconnect support” on page 85.

QUESTION: How can I control which interconnect is used for running my

application?