We are getting a few calls to support container workloads on our Slurm cluster; 
I want to support these user's usecases, so am looking into it now.

The problem for me is, I'm not super-familiar with container runtimes excepting 
(regular rootful) Docker... I see that any Slurm-compatible runtime must be 
"rootless", so that takes out the integration with regular Docker. How does one 
choose between the many options (from what I gather, Apptainer/Singularity, 
Podman, and rootless Docker seem to be the most widely-used.) We also have to 
support GPUs in these containers, but I assume that any of these can support 
that.

Can anyone tell me what the most popular Slurm-compatible container runtime may 
be, and plusses/minuses of the three I mentioned above? Thanks!

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