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Subject: Re: [OMPI users] Mixing the FORTRAN and C APIs.
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-05-07 17:04:34


On May 7, 2011, at 5:01 PM, Jeff Squyres wrote:

> example, if you have to pass an MPI datatype down to PARPACK, you'd actually need to pass MPI_Type_f2c(MPI_INTEGER), or MPI_Type_f2c(MPI_DOUBLE_PRECISION).

Blarg -- I got these backwards. I should have said:

> MPI_Type_c2f(MPI_INTEGER), or MPI_Type_c2f(MPI_DOUBLE_PRECISION).

Because the MPI_INTEGER and MPI_DOUBLE_PRECISION handles you're using are C handles, and you need to translate them to the equivalent Fortran handles (i.e., the integer handle values you see in mpif.h.). Try it -- cout the return value from MPI_Type_c2f(MPI_INTEGER) and it should match the value you see in mpif.h.

-- 
Jeff Squyres
jsquyres_at_[hidden]
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