No, datatypes are meant to be persistent for a reasonably long period.

Also, for general MPI questions, please use stack overflow or equivalent.  This list is for MPICH related questions.

  -- Pavan

> On Mar 9, 2015, at 3:30 PM, mhgardner <mhgardner@berkeley.edu> wrote:
>
> Hi,
>
> I'm rather new to MPI, but I'm trying to define a derived MPI struct data type. The data type is made up of int, float and vector types. The number of entries in the vector elements are not constant throughout the analysis, so is there a way to define an MPI data type that can deal with vectors of changing size? Or is it better to create vectors of fixed extent and just add enough padding so they don't overflow?
>
> Thanks,
>
> Mike

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--
Pavan Balaji  ✉️
http://www.mcs.anl.gov/~balaji

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