[mpiwg-sessions] Sessions WG - meet 1/29/24

[Pritchard Jr., Howard]

Hi Folks,

Let’s meet on 1/29 to continue discussions related to sessions and FT.

I think what will help is to consider several use cases and implications.

Here are some I have

  *   App using sessions to init/finalize and create at least one initial communicator with MPI_Comm_create_from_group,  but also wants to use methods available in slice1 of ULFM proposal to shrink/repair communicators.  Are there any problems?
  *   App using sessions to init/finalize and create at least one initial communicator with MPI_Comm_create_from_group, and wants to use methods available in slice 1 of ULFM proposal to create new group from a pset and create a new communicator
  *   App using sessions to init/finalize, etc. and when a fail-stop error is detected destroy the session, create a new session query for process sets, etc. and start all over.

We should also consider the behavior of MPI_Comm_create_from_group if a process failure occurs while creating a new communicator.  The ULFM slice 1 discusses behavior of MPI_COMM_DUP and process failure.  We’d probably want similar behavior for MPI_Comm_create_from_group.

For those with access, the ULFM slice 1 PR is at https://github.com/mpi-forum/mpi-standard/pull/947

Thanks,

Howard

-------

[signature_61897647]
Howard Pritchard
Research Scientist
HPC-ENV

Los Alamos National Laboratory
howardp at lanl.gov<mailto:howardp at lanl.gov>

[signature_1672648044]<https://www.instagram.com/losalamosnatlab/>[signature_2067890307]<https://twitter.com/LosAlamosNatLab>[signature_1942525183]<https://www.linkedin.com/company/los-alamos-national-laboratory/>[signature_882949974]<https://www.facebook.com/LosAlamosNationalLab/>


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mpi-forum.org/pipermail/mpiwg-sessions/attachments/20240125/2f5e395e/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 4350 bytes
Desc: image001.png
URL: <http://lists.mpi-forum.org/pipermail/mpiwg-sessions/attachments/20240125/2f5e395e/attachment-0005.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 1981 bytes
Desc: image002.png
URL: <http://lists.mpi-forum.org/pipermail/mpiwg-sessions/attachments/20240125/2f5e395e/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 1517 bytes
Desc: image003.png
URL: <http://lists.mpi-forum.org/pipermail/mpiwg-sessions/attachments/20240125/2f5e395e/attachment-0007.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.png
Type: image/png
Size: 1334 bytes
Desc: image004.png
URL: <http://lists.mpi-forum.org/pipermail/mpiwg-sessions/attachments/20240125/2f5e395e/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 999 bytes
Desc: image005.png
URL: <http://lists.mpi-forum.org/pipermail/mpiwg-sessions/attachments/20240125/2f5e395e/attachment-0009.png>