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C – Troubleshooting
InfiniPath MPI Troubleshooting
C-16 IB6054601-00 D
Q
For these examples in Section C.8.5 below, we assume that these new locations
are:
/path/to/devel (for mpi-devel-*)
/path/to/libs (for mpi-libs-*)
C.8.5
Compiling on Development Nodes
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
C.8.6
Specifying the Run-time Library Path
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
-L/path/to/libs/lib -Wl,-rpath,/path/to/libs/lib