Hello all,

in the call today I had claimed that colleagues here had done some experiments on MPI in Docker containers.

Unfortunately when I asked them the denied every having done such a thing.

So: I cannot say I have any numbers that I could provide about any MPI related performance impact of using docker / singularity / apptainer images on cluster (NCSA Delta to be specific).

However, I former colleague (left NCSA since then) did experiments on our former cluster (BlueWaters) with an older container engine (shifter):

https://bluewaters.ncsa.illinois.edu/liferay-content/image-gallery/content/B...

which on page 16 shows MPI speeds for shifter vs directly using the MPI stack (in both cases it uses Cray's proprietary MPI stack delivered by BlueWaters).

Page attached for reference.

Yours, Roland

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Yours, Roland