Q-Logic IB6054601-00 D 用户手册

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 

.)

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.

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.

mpirun-ssh

 was renamed mpirun-ipath-ssh so as to avoid name 

collisions with other MPI implementations.