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

Frequently asked questions
Network specific
Appendix D 305
ANSWER: The environment variable MPI_IC_ORDER instructs HP-MPI to
search in a specific order for the presence of an interconnect. The
contents are a colon separated list. For a list of the default contents, see
“Interconnect support” on page 85.
Or, mpirun command line options can be used which take higher
precedence than MPI_IC_ORDER. Lowercase selections imply to use if
detected, otherwise keep searching. Uppercase selections demand the
interconnect option be used, and if it cannot be selected the application
will terminate with an error. For a list of command line options, see
Table 3-5 on page 85.
An additional issue is how to select a subnet when TCP/IP is used and
multiple TCP/IP subnets are available between the nodes. This can be
controlled by using the -netaddr option to mpirun. For example:
% mpirun -TCP -netaddr 192.168.1.1 -f appfile
This will cause TCP/IP to be used over the subnet associated with the
network interface with IP address 192.168.1.1.
For more detailed information and examples, see “Interconnect support”
on page 85.
For Windows, see the Windows FAQ section.