[MPIWG Fortran] Assumed-size array in MPI3

Bill Long longb at cray.com
Mon Mar 10 11:24:00 CDT 2014

I agree with Steve.  In these sorts of calls the actual size of the array is available from somewhere else - either another argument or information in the communicator.  This is the common situation when calling C.


On Mar 10, 2014, at 11:06 AM, Junchao Zhang <jczhang at mcs.anl.gov> wrote:

> Hello,
>   I read a Fortran textbook, which says "Assumed-size dummy arrays are a holdover from earlier versions of Fortran. They should never be used in any new programs".
>   But I find MPI3 has interfaces like
> MPI_Alltoallv(sendbuf, sendcounts, sdispls, sendtype, recvbuf, recvcounts, rdispls, recvtype, comm, ierror)
>  ...
>  INTEGER, INTENT(IN) :: sendcounts(*), sdispls(*), recvcounts(*), rdispls(*)
>  ...
>   I was wondering why MPI3 still uses it.
>   Thanks.
> --Junchao Zhang
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Bill Long                                                                       longb at cray.com
Fortran Technical Suport  &                                  voice:  651-605-9024
Bioinformatics Software Development                     fax:  651-605-9142
Cray Inc./ Cray Plaza, Suite 210/ 380 Jackson St./ St. Paul, MN 55101

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