Yes, the "Extended Support" listed of about 5 additional routines, but as far as I understand, MPI_SIZEOF is the only one that needs an INTERFACE description in mpif.h. All other routines are without any implementation-problems. Therefore, it would be enough to allow in the special case that MODULE (and INTERFACE) are not supported by the target compiler, that - the Fortran Support requires only mpif.h (same as in MPI-2.0), and - MPI_SIZEOF is not provided. Additionally, we can restrict the MPI_SIZEOF support only 23 dimensions - in mpif.h - or generally if TS29113 or other non-Standard methods are not available, supposed that "DOUBLE PRECISION" is the longest Fortran type Name: 123456789012345678901234567890123456789012345678901234567890123456789012 SUBROUTINE MPI_SIZEOF(x,n) DOUBLE PRECISION x(1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,*) ! 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 What did mpich and OpenMPI in the past with MPI_SIZEOF? Rolf ----- Original Message -----

From: "William Gropp" <[email protected]> To: "MPI-WG Fortran working group" <[email protected]> Sent: Saturday, June 14, 2014 6:36:35 AM Subject: Re: [MPIWG Fortran] MPI_SIZEOF: Errata required (was: Another MPI_SIZEOF question)

Not quite true.  See my email, which gives specific locations in the standard for the relevant text.  Note also that MPI_SIZEOF is *not* the only function that is not included in the "basic" Fortran support - the routines to create a type based on precision and range are also not required for basic support.  

I think there are two options for the so-called Fortran 77 support.  Continue to support the "basic" support, as defined in MPI-2, or delete it entirely.  Anything else is likely to leave errors and mistakes.  And while I agree with Jeff that its not good practice to remove something like F77 support at a point release, I believe that the language in the standard removed Fortran 77 with 3.0.  We're just now recognizing that.

Bill

William Gropp Director, Parallel Computing Institute Thomas M. Siebel Chair in Computer Science

University of Illinois Urbana-Champaign

On Jun 13, 2014, at 10:32 AM, Rolf Rabenseifner wrote:

2) The requirement of having this function in mpif.h was changed:

  MPI-2.0 through 2.2 requiered MPI_SIZEOF in mpif.h   "unless the target compiler does not support modules   or KIND-parametrized types."

  This restriction was removed.

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-- Dr. Rolf Rabenseifner . . . . . . . . . .. email [email protected] High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307)