[mpich-discuss] Problem with RMA && MPI_Type_vector when stride value is relatively large

[Junchao Zhang]

Also, you should use the latest stable release MPICH-3.1.3 at
http://www.mpich.org/downloads/

--Junchao Zhang

On Thu, Oct 16, 2014 at 8:40 AM, Seo, Sangmin <sseo at anl.gov> wrote:

>  Hi Victor,
>
>  Your code was not attached. Can you send it again?
>
>  Thanks,
> Sangmin
>
>
>  On Oct 16, 2014, at 6:34 AM, Victor Vysotskiy <
> victor.vysotskiy at teokem.lu.se> wrote:
>
>   Hi,
>
> I am straggling with a simple MPI program when a vector derived datatype
> is used as origin/remote datatypes in the MPI_Put RMA operation.  The
> underlying idea is quite simple: a contiguous  piece of memory is
> interpreted as a 2D array and only its certain slice is going to be updated
> via MPI_Put. To this end, I am using a  MPI_Type_vector call. Everything
> works fine when the stride value <= 24000, regardless count and
> blocklength. However, if stride is greater than 24000 then program simply
> hangs.  The source code is attached and you can simply verify the issue by
> compiling and running it with the following parameters:
>
> mpicc mpi_tvec_rma.c
>
> mpirun -np 2 ./a.out 10000 2000
>
> Ok
>
> mpirun -np 2 ./a.out 20000 2000
>
> Ok
>
> mpirun -np 2 ./a.out 30000 2000
>
> Hangs
>
> Is there any internal/known limits to the size of MPI_TYPE_VECTOR
> datatypes?
>
> So, I am really puzzled what is happening here and any help will be
> greatly appreciated!
>
> With best regards,
>
> Victor.
>
> P.S. The attached code is perfectly runs with the OpenMPI v1.8.2.
>
> P.P.S. Below are given some details about hardware and software setups
> used:
>
> MPICH2 Version:         1.5
>
> MPICH2 Release date:    Mon Oct  8 14:00:48 CDT 2012
>
> MPICH2 Device:          ch3:nemesis
>
> MPICH2 configure:       --prefix=/opt/mpi/mpich2/ --disable-weak-symbols
>
> MPICH2 CC:      gcc    -O2
>
> MPICH2 CXX:     c++   -O2
>
> MPICH2 F77:     gfortran   -O2
>
> MPICH2 FC:      gfortran   -O2
>
>  GCC version 4.7.3
>
>
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