Q-Logic IB6054601-00 D Benutzerhandbuch

C – Troubleshooting
InfiniPath MPI Troubleshooting

C-16

IB6054601-00 D

Q

For these examples in 

 below, we assume that these new locations 

are:

/path/to/devel (for mpi-devel-*)

/path/to/libs (for mpi-libs-*)

If the 

mpi-devel-*

 rpm is installed with the 

--prefix /path/to/devel

 option 

then 

mpicc

, etc. will need to be passed 

-I/path/to/devel/include

 in order for 

the compiler to find the MPI include files, as in this example:

$ mpicc myprogram.c -I/path/to/devel/include

If you are using Fortran90 or Fortran95, a similar option is needed for the compiler 
to find the module files:

$ mpif90 myprogramf90.f90 -I/path/to/devel/include

If the 

mpi-lib-*

 rpm is installed on these development nodes with the 

--prefix 

/path/to/libs 

option, then the compiler will need to be given the 

-L/path/to/libs

 option so it can find the libraries. Here is the example for mpicc:

$ mpicc myprogram.c  -L/path/to/libs/lib (for 32 bit) 

$ mpicc myprogram.c  -L/path/to/libs/lib64 (for 64bit) 

To find both the include files and the libraries with these non-standard locations, we 
would now see an example like this:

$ mpicc myprogram.c -I/path/to/devel/include -L/path/to/libs/lib

There are several ways to specify the run-time library path so that when the 
programs are run the appropriate libraries are found in the new location. There are 
three different ways to do this:

■

Use the 

-Wl,-rpath,

 option when compiling on the development node.

■

Update the 

/etc/ld.so.conf

 file on the compute nodes to include the path.

■

Export the path in the

.mpirunrc

 file.

These methods are explained in more detail below.

1. An additional linker option, 

-Wl,-rpath, 

supplies the run-time library path 

when compiling on the development node. The compiler options now look like 
this:

$ mpicc myprogram.c -I/path/to/devel/include