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Subject: Re: [OMPI users] MPI_TYPE_CREATE_SUBARRAY not in mpif90 library
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2011-02-16 10:40:00

What version of Open MPI are you using?

I just checked a trivial f90 MPI program and MPI_TYPE_CREATE_SUBARRAY seemed to work ok.

I am not a fortran expert, but when I have seen this type of error message before, it *usually* meant that there was a type mismatch between the types passed to the function and the function signature available in the f90 module. I.e., the compiler found a function matching the *name*, but wasn't able to find a match for the *type signature*.

Here's Open MPI's declaration of MPI_TYPE_CREATE_SUBARRAY:

interface MPI_Type_create_subarray
subroutine MPI_Type_create_subarray(ndims, size_array, subsize_array, start_array, order, &
        oldtype, newtype, ierr)
  integer, intent(in) :: ndims
  integer, dimension(*), intent(in) :: size_array
  integer, dimension(*), intent(in) :: subsize_array
  integer, dimension(*), intent(in) :: start_array
  integer, intent(in) :: order
  integer, intent(in) :: oldtype
  integer, intent(out) :: newtype
  integer, intent(out) :: ierr
end subroutine MPI_Type_create_subarray
end interface

One thing you might want to double check is that OMPI was compiled with MPI_REAL8 support (since MPI_REAL8 was passed to the subroutine). Run this:

shell$ ompi_info --all | grep real8
         Fort have real8: yes
         Fort real8 size: 8
        Fort real8 align: 8

Finally, note that Open MPI doesn't have many of the F90 symbols that you might expect in because most of our F90 support is "direct pass through" to the F77 subroutines. Specifically, our F90 mpi module simply provides compile-time checking for expected signatures, but the subroutine call is actually automatically linked against the corresponding symbol in Only a few subroutines -- i.e., the ones that have multiple different type signatures -- actually appear in

Meaning: MPI_TYPE_CREATE_SUBARRAY only has one type signature. So it's normal / expected that you don't see /mpi_type_subarray/i in

On Feb 15, 2011, at 1:18 PM, Petit, George (Cont, ARL/CISD) wrote:

> A user posted the following ticket to our site. Should the referenced MPI routine be included in the mpif90 library? If not, why? And is there a way to get it added.
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> I receive the following error when I try to compile my code with ifort with the
> openmpi library:
> grid.f(38): error #6285: There is no matching specific subroutine for this generic
> subroutine call. [MPI_TYPE_CREATE_SUBARRAY]
> call
> mpi_type_create_subarray(3,isizes,isubs,istarts,MPI_ORDER_FORTRAN,MPI_REAL8,DTghost(1),ierr)
> -------------^
> It looks like the 'mpi_type_create_subarray' routine is missing from the openmpi
> library The routine is in Is it possible to add it
> to the f90 library? The fortran 90 versions of mpi for sgi_mpt, xt-mpt, ibm-mpi and
> intelmpi all include this routine. Thanks. -Rob
> George Petit
> Lockheed Martin
> ARL DSRC Customer Support Team Lead
> george.petit_at_[hidden]
> 410-278-9283
> _______________________________________________
> users mailing list
> users_at_[hidden]

Jeff Squyres
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