[mpich-discuss] MPI I/O using large integers in file type

[Rajeev Thakur]

MPI_Type_create_hindexed does.

Rajeev

On Sep 7, 2011, at 1:21 PM, Nick Stokes wrote:

> Dear all,
> 
> I have an application where a large field data is computed in pieces.
> The pieces are stored contiguously in process's local memory, but
> correspond to an arbitrary collection of  (monotonically increasing)
> indexed locations in the final (large) field data.
> 
> The natural choice seemed to be to define a File view using
> MPI_Type_index filetype, and READ & WRITE local data using an
> MPI_Vector (or contiguous) type. This works fine for  small enough
> fields, but it seems it is going to fail for  large fields (>4GB),
> since MPI_Type_indexed takes int for displacements.
> 
> Is there an indexed type which can take 64-bit integers and can be
> used for defining file views? Or is there an alternative?
> 
> Thanks
> - Nick
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