[mpiwg-tools] Active / inactive pvars

[Junchao Zhang]

Hello,
  The MPI standard says "However, MPI implementations are not allowed to
change the index of a performance variable or to delete a variable once it
has been added to the set. When a variable becomes inactive, e.g., through
dynamic unloading, accessing its value should return a corresponding error
code."  Does it imply,
  1) MPI_T_pvar_get_num() will return a N that counts both active and
inactive pvars
  2) MPI_T_pvar_get_info(par_index, ...,)  may return
MPI_T_ERR_INVALID_INDEX even for a par_index < N
  3) When a pvar is re-activated, it keeps its old index?

 These are not obvious in the standard.

 Thanks.
--Junchao Zhang
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