At p578 of the standard,

MPI_T_PVAR_HANDLE_ALLOC(session, pvar_index, obj_handle, handle, count)
...
OUT count number of elements used to represent this variable (integer)

It looks to me that pvar can have different classes, e.g., MPI_T_PVAR_CLASS_COUNTER, and datatypes, e.g., MPI_UNSIGNED. And a pvar can be an array (of length count) of such datatypes.

I guess the common case is count=1.

Is my understanding correct?

Yes, your understanding is correct.

Hope that helps,

Kathryn

Thanks

--Junchao Zhang
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______________________________________________________________
Kathryn Mohror, kathryn@llnl.gov, http://people.llnl.gov/mohror1
CASC @ Lawrence Livermore National Laboratory, Livermore, CA, USA