[OMPI devel] Open MPI + UCX paramater tunging

[Christoph Niethammer via devel]

Hello,

With UCX one has to define UCX environment variables to tune the runtime 
behaviour beside the commonly used mca parameters.
This can lead - at least for me - to confusion as some of them seem to be 
"identical".
Also, to my current experience only the UCX variables seem often to have an 
effect.
Example: btl_*_eager_limit vs. UCX_RNDV_THRESH


Having now an external environment I am not totally sure, what the role of the 
mca parameters vs the UCX variables is (and the corresponding two tools 
ompi_info/ucx_info).

For the moment at least I would welcome if the Open MPI documentation could 
include some more information and maybe best practices about this.


Best
Christoph Niethammer

--

Christoph Niethammer
High Performance Computing Center Stuttgart (HLRS)
Nobelstrasse 19
70569 Stuttgart

Tel: ++49(0)711-685-87203
email: nietham...@hlrs.de
http://www.hlrs.de/people/niethammer

Re: [OMPI devel] [Open MPI Announce] Open MPI v5.0.0rc13 is available for testing

[Christoph Niethammer via devel]

Hello Austen,

Unfortunately I could not attend the last telco and therefore I do not know if 
this was discussed.
So I'd like to bring up attention for 
https://github.com/mpi-forum/mpi-issues/issues/765
It is not voted on yet but seems to have support to go in.
As Partitioned communication is introduced in 5.0 Open MPI could do it possibly 
'right' from the start ... 

Best
Christoph

- Original Message -
From: "Austen Lauria via announce" 
To: "Open MPI Developers" , 
annou...@lists.open-mpi.org
Cc: "Austen Lauria" 
Sent: Saturday, 30 September, 2023 00:09:22
Subject: [Open MPI Announce] Open MPI v5.0.0rc13 is available for testing

Open MPI v5.0.0rc13 is now available for testing at 
https://www.open-mpi.org/software/ompi/v5.0/ .

NOTE: This is expected to be the last v5.0.0 release candidate before release 
unless any issues arise.

Please test and send feedback either via the user mailing lists or create an 
issue at https://github.com/open-mpi/ompi/issues/ .

See https://docs.open-mpi.org/en/v5.0.x/news/news-v5.0.x.html for a list of 
changes since rc12.

Thank you,
v5.0 Release Managers

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