Hi All, The next point-to-point teleconference will be on Monday 19th January 2015 at 11am Central US via webex. Connection details are on the point-to-point wiki page: https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/PtpWikiPage Agenda: 1) New INFO keys - specifically the "can INFO keys change the semantic behaviour of MPI?" issue (see summary from Jim below) 2) Progress on Arecv and Fsend 3) Other stuff? Cheers, Dan. On 12/01/2015 15:39, Jim Dinan wrote:

Hi All,

Apologies for missing the meeting. There was a lot of discussion at the Forum about the validity of restricting the application's behavior using info keys (or, if you prefer, the application asserting its behavior through info keys). Folks indicated that this qualifies as a semantic change for the given communicator, which is forbidden by Section 6.4.4 and made more complicated because MPI_Comm_dup propagates info keys.

In response to this feedback, I started working on a straw man communicator assertions interface that would allow the application to assert what its behavior will be. I will prepare this for discussion at a future WG meeting.

In parallel, I have had discussions with others who feel that the opinion expressed at the Forum meeting is incorrect; that it should be valid to provide hints on application behavior through info keys.

At the same time, the straw vote at the December meeting indicated that the Forum as a whole would like to pursue this capability for the MPI standard. So, much more discussion and debate is needed. Looking forward to it,

~Jim.

-- Dan Holmes Applications Consultant in HPC Research EPCC, The University of Edinburgh James Clerk Maxwell Building The Kings Buildings Peter Guthrie Tait Road Edinburgh EH9 3FD T: +44(0)131 651 3465 E: [email protected] *Please consider the environment before printing this email.* The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.