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3 – Using InfiniPath MPI
InfiniPath MPI Details
IB6054601-00 D 3-13
Q
LD_LIBRARY_PATH, and other environment variables for the node programs
through the use of the
-rcfile option of mpirun:
$ mpirun -np n -m mpihosts -rcfile mpirunrc program
In the absence of this option, mpirun checks to see if a file called
$HOME/.mpirunrc exists in the user's home directory. In either case, the file is
sourced by the shell on each node at time of startup of the node program.
The .
mpirunrc should not contain any interactive commands. It may contain
commands that output on
stdout or stderr.
When you do not specify an
mpirunrc file, either through the option or the default
~/.
mpirunrc, the environment on each node is whatever it would be for the user’s
login via
ssh, unless you are using MPD. (See section 3.8.)
There is a global options file that can be used for
mpirun arguments. The default
location of this file is:
/opt/infinipath/etc/mpirun.defaults
You can use an alternate file by setting the environment variable
$PSC_MPIRUN_DEFAULTS_PATH. See the mpirun man page for more
information.
3.5.8.1
Environment for Multiple Versions of InfiniPath or MPI
The variable INFINIPATH_ROOT sets a root prefix for all Infinipath-related paths.
It is used by mpirun to try to find the mpirun-ipath-ssh executable, and it is
also used to set up LD_LIBRARY_PATH for new programs. This allows multiple
versions of the InfiniPath software releases to be installed on some or all nodes, as
well as having InfiniPath MPI and other version(s) of MPI installed at the same time.
It may be set in the environment, in mpirun.defaults, or in an rcfile (such
as .mpirunrc, .bashrc or .cshrc) that will be invoked on remote nodes.
If you have used the --prefix argument with the rpm command to change the
root prefix for the InfiniPath installation, then set INFINIPATH_ROOT to the same
value.
If INFINIPATH_ROOT is not set, the normal PATH is used unless mpirun is invoked
with a full pathname.
NOTE: mpirun-ssh was renamed mpirun-ipath-ssh so as to avoid name
collisions with other MPI implementations.