[mpich-discuss] datatypes and MPI-3 shared memory windows

[Luis Cebamanos]

Hi Min,

Thanks for your help. My intention is to use shared mem windows in a 3D
halo exchange communication. The application already uses complex MPI
datatypes for the exchange of edges and corners. I guess my question is
how should I deal with this? Should I manually unpack the MPI datatypes
into a shared memory buffer, then communicate (intra- and inter- node)
and finally pack the data back to its original data structure so the
simulation can carry on with other operations.

double *baseptr;
MPI_Win_allocate_shared (len, 1, MPI_INFO_NULL, mpi3->shmcomm,
                                         &baseptr, &mpi3->win);

Pointer baseptr gives me the address to the shared mem window, but I
cannot see the way of using datatypes in the shared mem created.

Thanks
Lux

On 10/05/2018 16:53, Min Si wrote:
> Hi Lux,
>
> Yes, you can use MPI datatype with shared window. Can you provide more
> information about the purpose to use shared window thus we can give
> appropriate suggestion ?
>
> Best regards,
> Min
>
> On 2018/05/10 10:05, Luis Cebamanos wrote:
>> Hi all,
>>
>> Is there a way to deal with MPI datatypes when using shmm windows? What
>> is the advice to convert a flat MPI code that uses MPI datatypes for
>> halo exchanges to use shmm windows?
>>
>> Thanks!
>> Lux
>>
>>
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