[MPICH] Problem in Sending MPI_OFFSET_KIND

[William Gropp]

At 08:22 AM 12/12/2005, Gaetano Bellanca wrote:
>Hi,
>
>I'm having problem in sending a variable of type MPI_OFFSET_KIND. I need 
>to broadcast this variable, but MPI_BCAST does not work sending this 
>variable as a MPI_OFFSET_KIND variable. I need to send it as a MPI_INTEGER.
>
>Is this correct?

Not quite.  MPI_OFFSET_KIND is not an MPI Datatype, so you can't use it to 
send an item of that type.  When we implement MPI_SIZEOF and 
MPI_TYPE_MATCH_SIZE, you can use those to get a matching MPI 
datatype.  Until then you'll need to find a datatype that is of the same 
length as a variable that is declared as an integer of kind=MPI_OFFSET_KIND.

Bill


>The program is written in F90 and has the same behavior in the Linux and 
>Windows version of MPICH2.
>
>
>Regards.
>
>Gaetano
>
>
>----------
>Gaetano Bellanca - Department of Engineering - University of Ferrara
>Via Saragat, 1 - 44100 - Ferrara - ITALY
>Voice:  +39 0532 97.48.09   Fax:  +39 0532 97.48.70
>mailto:gaetano.bellanca at unife.it
>
>----------

William Gropp
http://www.mcs.anl.gov/~gropp