Notes 2020 07 03

MPI Tools WG Meeting 2020-07-02

Participants

• Bengisu Elis
• Marc-André Hermanns
• Joachim Protze
• Martin Schulz

Topics

QMPI

• How to do registration?
  • API should use an abstract handle to hide implementation details
    • Potential workflow:
      1. Create registration handle
      2. Add function registration to handle (light-weight)
      3. Perform actual registration in bulk with all functions associated with registration handle (heavy-weight)
  • Should we use Enum values or Strings?

Ticket 160 / PR#161

• Need to change wording into a more positive way

  • "It is only valid to bind .... is valid for use as an argument ..."

• Still unclear whether we need the restriction of MPI_T calls

  • There are 3 handle allocation calls that take binding arguments
  • Would a wording like "a handle can only be used as a binding argument when it can be used in MPI calls outside MPI_T handle allocation" be sufficient?
    • We should use the "if there exists" and not "for all"
      • Uncommited datatypes are not valid in all MPI calls, but in some and might still be valid subject to tracking using MPI_T

• Need to check with Sessions WG how to formulate the the part of "initialization" and "point of execution"