[Beowulf] mixing MPI with other libraries...

[Bill Rankin]

On Jun 26, 2005, at 11:30 PM, Cheng, Kevin wrote:
>
> 1. If one had an existing project, say a GTK or QT application with  
> Makefile and everything. If one wanted to incorporate MPI into this  
> project, one would just replace (in the Makefile) the 'GCC = gcc'  
> to 'GCC = mpicc', 'GXX = g++' to 'GXX = mpicxx', and also maybe  
> include some MPI lib paths to the INCPATHs? Is this how one can  
> convert normal projects into projects incorporating MPI calls?

That should work - mpicc is just a front end wrapper - so give it a try!

The mpicc script also sets up all the appropriate include and library  
paths.
>
> 2. If one had an existing C MPI program. What would be the side- 
> effects of using the mpicxx to compile C code? Is it strict for one  
> to use the MPI:: classes opposed to MPI_ C functions.. when force  
> compiling under C++?

Either will do.  The MPI-1 standard contained only C and FORTRAN  
bindings, while the MPI-2 standard included the C++ bindings.  If you  
only have access to an MPI-1 implementation (eg. MPICH v1.X) then you  
may end up having to use the C bindings instead of C++.

Good luck,

-bill

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