HP-MPI Version 2.2.5 for Linux Release Note

HP-MPI V2.2.5 for Linux Release Note

What’s in This Version

5. Interconnect Selection Examples

Example 1 Interconnect Selection

% echo MPI_IC_ORDER

elan:TCP

% export MPIRUN_SYSTEM_OPTIONS="-netaddr 192.168.1.1"

% export MPIRUN_OPTIONS="-prot"

% $MPI_ROOT/bin/mpirun -prun -n4 ./a.out

The command line for the above will appear to mpirun as $MPI_ROOT/bin/mpirun

-netaddr 192.168.1.1 -prot -prun -n4 ./a.out and the interconnect decision will

look for the presence of Elan and use it if found. Otherwise, TCP/IP will be used and the

communication path will be on the same subnet as the 192.168.1.* host.

Example 2 TCP/IP over GigE

The following is an example using TCP/IP over GigE, assuming GigE is installed and

192.168.1.1 corresponds to the ethernet interface with GigE. Note the implicit use of

-netaddr 192.168.1.1 is required to effectively get TCP/IP over the proper subnet, if eth0

is not the gigabit interface.

% echo MPI_IC_ORDER

elan:TCP

% export MPIRUN_SYSTEM_OPTIONS="-netaddr 192.168.1.1"

% $MPI_ROOT/bin/mpirun -prot -TCP -prun -n4 ./a.out

Example 3 TCP/IP over Elan4

The following is an example using TCP/IP over Elan4, assuming Elan4 is installed and

configured. The subnet information is omitted, Elan4 is installed and configured, and

TCP/IP via -TCP is explicitly requested.

% echo MPI_IC_ORDER

elan:TCP

% export MPIRUN_SYSTEM_OPTIONS=" "

% $MPI_ROOT/bin/mpirun -prot -TCP -prun -n4 ./a.out

Example 4 Protocol Maps

• This runs on Elan