[Mpi3-hybridpm] MPI_Info argument in the thread start/end calls

[Pavan Balaji]

Hi all,

I was discussing the thread start/end call proposal 
(https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/161) with Alexander 
Supalov (Intel) and Abhinav Vishnu (PNNL). One point that came up in the 
discussion was with respect to the MPI_Info argument.

The first version of the API did not have this argument. However, a few 
telecons back, there was a discussion on this and we decided to add the 
MPI_Info argument. Is this argument needed? Alexander pointed out (and I 
agree) that if there is a fixed set of hints that we are planning to 
pass to the MPI implementation, then making them as true parameters 
might be better. On the other hand, having MPI_Info as an argument would 
allows us to later add implementation-specific extension hints as well; 
but are there thoughts on what these hints might be?

While I don't strongly feel one way or the other, I'd like to reinitiate 
this discussion and see if we can come to a consensus on this.

Thoughts?

  -- Pavan

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji