On 11/11/2016 07:36 AM, Dorier, Matthieu wrote:

Hi,

I have a trace of an MPI program in which parameters of every MPI calls have been recorded. Some communication functions are using a user-defined type created with MPI_Type_create_darray.

I would like to know what is the size of this type as a function of the parameters passed to MPI_Type_create_darray (again, I'm working on a trace, so I can't just call MPI_Type_size). We can assume, for simplicity, that the oldtype parameter is MPI_BYTE. I'm having troubles understanding, from the standard and from online documentation, how this function works and how I can compute this size. Could you help?

the romio flatten.c and ad_darray.c code might be helpful? I'd be tempted to make your trace program a singleton MPI program just so you *can* call MPI_Type_size. Or, make two passes over your trace and generate a darray lookup table? ==rob

Thanks,

Matthieu

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