Q-Logic IB6054601-00 D Manual De Usuario

C – Troubleshooting

InfiniPath MPI Troubleshooting

IB6054601-00 D

C-17

Q

The above compiler command insures that the program will run using this path 
on any machine. 

For the second option, we change the file 

/etc/ld.so.conf 

on the compute 

nodes rather than using the 

-Wl,-rpath, 

option when compiling on the 

development node.

 

We assume that the 

mpi-lib-*

 rpm is installed on the 

compute nodes with the same 

--prefix /path/to/libs 

option as on the 

development nodes. Then, on the computer nodes we then add the following 
lines to the file 

/etc/ld.so.conf. 

/path/to/libs/lib 

/path/to/libs/lib64 

Then, to make sure that the changes are picked up, run (as root):

# /etc/ldconfig

The libraries can now be found by the runtime linker on the compute nodes. 
This method has the advantage that it will work for all InfiniPath programs, 
without having to remember to change the compile/link lines.

2. Instead of either of the two above mechanisms, you can also put this line in the 

~/.mpirunrc

 file:

export LD_LIBRARY_PATH=/path/to/libs/{lib,lib64}

See 

 in the chapter “Using InfiniPath MPI” for more information 

on using the 

-rcfile

 option to 

mpirun

. 

Choices between these options are left up to the cluster administrator and the 
MPI developer. See the documentation for your compiler for more information 
on the compiler options.

It is now possible to run different implementations of MPI, such as HP-MPI, over 
InfiniPath. Many of these implementations share command (such as mpirun) and 
library names, so it is important to distinguish which MPI version is in use. This is 
done primarily through careful programming practices.