Notes 2016 05 26

Participants

• Jean-Baptiste Besnard
• Marc-Andre Hermanns
• Natahn Hjelm
• Kathryn Mohror
• Soren Rasmussen

Topics

MPI_T Events

• How to communicate type signatures of returned event information?
  • We probably need a pack/unpack mechanism.
  • Should we use existing MPI_PACKED types?
  • Would an array of basic MPI datatypes suffice?
  • Should there be some basic information that is communicated on every event?
    • If implementation does not provide the specific field a controlled undefined value could be provided.
    • Would the extended info then be communicated as a 'packed' buffer or would it be a 'padded' struct?
• Initialization
  • MPI_T_init_thread should be sufficient
• How to bind Events to specific objects?
  • What about tracking events within MPI_Init, e.g., MPI_COMM_WORLD?
  • Do we need a special mechanism to attach in these situations?
• Grouping of events
  • Should something like a group_id or chaid_id identify events that preceed/succeed each other?