I just ran a simple program to output the list of performance variables available at MPI initialisation. That it compiled and ran indicates that MPICH does at least support the interface, however it returned 0 variables available. Is this true - that MPICH supports the interface but exports no performance variables? The other possible scenario I could envisage is that MPICH exports possibly many variables but these aren't available at initialisation time, rather they are dynamically exported as processes and communicators are created. However, if this is the case I don't understand the expected usage model. It's not clear how you could make use of this data without very awkward processing because the underlying datatypes are only exported as an MPI_Datatype opaque handle. Does either of these 2 scenarios reflect the extent of MPI_T support? _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss