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3 – Using InfiniPath MPI
Configuring MPI Programs for InfiniPath MPI
3-4 IB6054601-00 D
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and run it with:
$ mpirun -np 2 -m mpihosts ./pi3f90
The C++ program hello++.cc is a parallel processing version of the traditional
“Hello, World” program. Notice that this version makes use of the external C
bindings of the MPI functions if the C++ bindings are not present.
Compile it:
$ mpicxx -o hello hello++.cc
and run it:
$ mpirun -np 10 -m mpihosts ./hello
Hello World! I am 9 of 10
Hello World! I am 2 of 10
Hello World! I am 4 of 10
Hello World! I am 1 of 10
Hello World! I am 7 of 10
Hello World! I am 6 of 10
Hello World! I am 3 of 10
Hello World! I am 0 of 10
Hello World! I am 5 of 10
Hello World! I am 8 of 10
Each of the scripts invokes the PathScale compiler for the respective language and
the linker. See section 3.5.3 for an example of how to use the
gcc compiler. The
use of
mpirun is the same for programs in all languages.
3.4
Configuring MPI Programs for InfiniPath MPI
When configuring an MPI program (generating header files and/or Makefiles), for
InfiniPath MPI, you will usually need to specify
mpicc, mpif90, etc. as the compiler,
rather than
pathcc, pathf90, etc.
Typically this is done with commands similar to these (this assumes you are using
sh or bash as your shell):
$ export CC=mpicc
$ export CXX=mpicxx
$ export F77=mpif77
$ export F90=mpif90
$ export F95=mpif95
The shell variables will vary with the program being configured, but these examples
show frequently used variable names. Users of
csh would instead use commands
similar to:
$ setenv CC mpicc