[mpiwg-sessions] MPI_Buffer_attach in the sessions model

[Rolf Rabenseifner]

Dear sessions-group,

is there any information about the usage of MPI_Buffer_attach, 
MPI_Buffer_detach and MPI_Bsend for applications that use the 
world model together with (several) sessions.

MPI-4.0, the function index entries of MPI_Buffer_attach and
the corresponding texts do not give an answer, or do they?

Is it allowed or intended that two MPI_Bsend calls with two different 
communicators derived not from the same session or world
may use portions of the same buffer that was attached with MPI_Buffer_attach?

Is there any issue or pull request already for this problem prepared?
Or slides in previous meetings?

Best regards
Rolf

-- 
Dr. Rolf Rabenseifner . . . . . . . . . .. . . rabenseifner at hlrs.de .
High Performance Computing Center (HLRS) . . . ++49(0)711/685-65530 .
University of Stuttgart . . . . . . www.hlrs.de/people/rabenseifner .
Nobelstr. 19, 70569 Stuttgart, Germany