Q-Logic IB6054601-00 D Manuel D’Utilisation

3 – Using InfiniPath MPI

MPD

IB6054601-00 D

3-17

Q

-statsfile file-prefix

Specifies alternate file to receive the output from the 

-print-stats

 option. 

Default: 

stderr

Support for multiple MPI implementations has been added. You can use a different 
version of MPI and achieve the high-bandwidth and low-latency performance that 
it is standard with InfiniPath MPI. 

The currently supported implementations are HP-MPI, OpenMPI and Scali.

These MPI implementations will run on multiple interconnects, and have their own 
mechanisms for selecting which one you will run on. Please see the documentation 
provided with the version of MPI that you wish to use. 

If you have downloaded and installed another MPI implementation, you will need 
to set your PATH up to pick up the version of MPI you wish to use. 

You will also need to set LD_LIBRARY_PATH, both in your local environment and 
in an rcfile (such as .mpirunrc, .bashrc or .cshrc) that will be invoked on 
remote nodes. See 

 and 

 for information on setting up 

your environment and 

 for information on setting your run-time library 

path. See also 

 for information on run time errors that may occur if 

there are MPI version mismatches. 

Some MPI implementations can be run over uDAPL. uDAPL is the user mode 
version of the Direct Access Provider Library (DAPL). Examples of such MPI 
implementations are Intel MPI and one option on OpenMPI.

If you are running such an MPI implementation, the rdma_cm and rdma_ucm 
modules will need to be loaded. To test these modules, use these commands (as 
root):

# modprobe rdma_cm

# modprobe rdma_ucm

To ensure that the modules are loaded whenever the driver is loaded, add rdma_cm 
and rdma_ucm to the OPENFABRICS_MODULES assignment in 
/etc/sysconfig/infinipath.

MPD is an alternative to 

mpirun

 for launching MPI jobs. It is described briefly in the 

following sections.