Loading shared library in open-mpi/ mpi-run

Question

I'm trying to run my program using torque scheduler using mpi run. Though in my pbs file I load all the library by

export LD_LIBRARY_PATH=/path/to/library

yet it gives error i.e.

error while loading shared libraries: libarmadillo.so.3: 
cannot open shared object file: No such file or directory. 

I guess error lies in variable LD_LIBRARY_PATH not set in all the nodes. How would I make it work?

Answer 1

LD_LIBRARY_PATH is not exported automatically to MPI processes, spawned by mpirun. You should use

mpirun -x LD_LIBRARY_PATH ...

to push the value of LD_LIBRARY_PATH. Also make sure that the specified path exists on all nodes in the cluster and that libarmadillo.so.3 is available everywhere.

Answer 2

On some systems, your environment isn't always propagated via mpirun. You should set all those variables in your .bashrc file.