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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-06-08 12:41:41


Would it be helpful if we provided some way to link in all the MPI
language bindings?

Examples off the top of my head (haven't thought any of these through):

- mpicxx_all ...
- setenv OMPI_WRAPPER_WANT_ALL_LANGUAGE_BINDINGS
   mpicxx ...
- mpicxx -ompi:all_languages ...

On Jun 6, 2007, at 12:05 PM, Lie-Quan Lee wrote:

> Hi Jeff,
>
> Thanks for willing to put more thought on it. Here is my simplified
> story. I have an accelerator physics code, Omega3P that is to perform
> complex eigenmode analysis. The algorithm for solving eigensystems
> makes use of a 3rd-party sparse direct solver called MUMPS (http://
> graal.ens-lyon.fr/MUMPS/). Omega3P is written in C++ with MPI. MUMPS
> is written in Fortran 95 with MPI fortran binding. And MUMPS requires
> ScaLAPACK and BLACS. (sometime the vendor provides a scientific
> library that includes BLACS and ScaLAPACK). They are both written in
> Fortran 77 with MPI Fortran binding.
>
> I often need to compile them in various computer platforms with
> different compilers for variety of reasons.
> As I mentioned before, I use C++ compiler to link the final
> executable. That will require MPI Fortran libraries and general
> Fortran libraries.
>
> What I did to solve the above problem is, I have a configure script
> in which I will detect the compiler and the platform, based on that I
> will add compiler and platform specific flags for the Fortran related
> stuff (libraries and library path). This does well until it hit next
> new platform/compiler...
>
> Some compilers made the above job slightly easier. For example in
> Pathscale compiler collection, it provides -lpathfortran for all what
> I need to link the executable using c++ compiler with fortran
> compiled libraries. So is IBM visual age compiler set if the wraper
> compilers (mpcc_r, mpf90_r) are used. The library name (-lxlf90_r) is
> different, though.
>
>
> best regards,
> Rich Lee
>
>
> On Jun 6, 2007, at 4:16 AM, Jeff Squyres wrote:
>
>> On Jun 5, 2007, at 11:17 PM, Lie-Quan Lee wrote:
>>
>>> it is a quite of headache for each compiler/platform to deal with
>>> mixed language
>>> issues. I have to compile my application on IBM visual age
>>> compiler,
>>> Pathscale, Cray X1E compiler,
>>> intel/openmpi, intel/mpich, PGI compiler ...
>>> And of course, openmpi 1.1 is different on this comparing with
>>> openmpi 1.2.2 (-lmpi_f77 is new to 1.2.2 version). :-)
>>
>>> You are right. MPI forum most like will not take care of this. I
>>> just
>>> made a wish ... :-)
>>
>> Understood; I know it's a pain. :-(
>>
>> What I want to understand, however, is what you need to do. It seems
>> like your needs are a bit different than those of the mainstream --
>> is there a way that we can support you directly instead of forcing
>> you to a) identify openmpi, b) call mpi<foo> --showme:link to get the
>> relevant flags, and c) stitch them together in the manner that you
>> need?
>>
>> We take great pains to ensure that the mpi<foo> wrapper compilers
>> "just work" for all the common cases in order to avoid all the "you
>> must identify which MPI you are using" kinds of games. Your case
>> sounds somewhat unusual, but perhaps there's a way we can get the
>> information to you in a more direct manner...?
>>
>> --
>> Jeff Squyres
>> Cisco Systems
>>
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-- 
Jeff Squyres
Cisco Systems