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4 – Running MPI on QLogic Adapters
Open MPI
IB0054606-02 A 4-5
Configuring MPI Programs for Open MPI
When configuring an MPI program (generating header files and/or Makefiles) for
Open MPI, you usually need to specify
mpicc
,
mpicxx
, and so on as the
compiler, rather than
gcc
,
g++
, etc.
Specifying the compiler is typically done with commands similar to the following,
assuming that you are using
sh
or
bash
as the shell:
$ export CC=mpicc
$ export CXX=mpicxx
$ export F77=mpif77
$ export F90=mpif90
The shell variables will vary with the program being configured. The following
examples show frequently used variable names. If you use
csh
, use commands
similar to the following:
$ setenv CC mpicc
You may need to pass arguments to
configure
directly, for example:
$ ./configure -cc=mpicc -fc=mpif77 -c++=mpicxx
-c++linker=mpicxx
You may also need to edit a Makefile to achieve this result, adding lines similar to:
CC=mpicc
F77=mpif77
F90=mpif90
CXX=mpicxx
In some cases, the configuration process may specify the linker. QLogic
recommends that the linker be specified as
mpicc
,
mpif90
, etc. in these cases.
This specification automatically includes the correct flags and libraries, rather than
trying to configure to pass the flags and libraries explicitly. For example:
LD=mpif90
These scripts pass appropriate options to the various compiler passes to include
header files, required libraries, etc. While the same effect can be achieved by
passing the arguments explicitly as flags, the required arguments may vary from
release to release, so it is good practice to use the provided scripts.
To Use Another Compiler
Open MPI and all other MPIs that run on InfiniBand
®
, support a number of
compilers, in addition to the default GNU Compiler Collection (GCC, including gcc,
g++ and gfortran) versions 3.3 and later. These include the PGI 8.0, through 11.9;
and Intel 9.
x , 10.1, 11. x , and 12. x .