Notes 2020 03 19

Meeting Notes 2020-0319

Participants

• Chris Chambreau
• Bengisu Elis
• Marc-Andre Hermanns
• Michael Knobloch
• Joachim Protze
• Martin Schulz

Topics

Handle introspection

• Library concept similar to OMPD

  • Third-Party library (outside of the process)
  • Looks at memory state of MPI library
  • Implemented by MPI library provider

• Maybe also as a first party interface?

  • Available as an API as first- and third- party at the same time?

• Do we need to provide additional information to the debugger?

  • We could add an additional parameter void *
  • Maybe this could be part of the QMPI interface?

• Example: MPI_Comm_get_envelope? - But would need non-local information - Return Comm creation routine - Return the associated group - Already exists (MPI_Comm_group)

• What's needed to understand arguments in the call

  • At what source code line was this communicator was created (code pointer)
  • What kind of type (just a dup or more complex?)
  • Group info (understand that this is a 'split-comm')
    • "Stop all processes with color 5"