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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
3.6
Using Other MPI Implementations
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 section 3.5.8 and section 3.5.3.1 for information on setting up
your environment and section C.8.6 for information on setting your run-time library
path. See also section C.8.7 for information on run time errors that may occur if
there are MPI version mismatches.
3.7
MPI Over uDAPL
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.
3.8
MPD
MPD is an alternative to mpirun for launching MPI jobs. It is described briefly in the
following sections.