Hi Junchao,

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 _______________________________________________ Mpi3-tools mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-tools

______________________________________________________________ Kathryn Mohror, [email protected], http://people.llnl.gov/mohror1 CASC @ Lawrence Livermore National Laboratory, Livermore, CA, USA