[slurm-users] Slurm release candidate version 26.05.0rc1 is available for testing

[Tim Wickberg via slurm-users]

We are pleased to announce the availability of Slurm release candidate
26.05.0rc1.

To highlight some new features coming in 26.05:

- New "srun --async" step mode that submits step processes to stepmgr to
queue and eventually launch. This avoids issues with keeping a large
number of srun processes backgrounded to queue up future step-based
workflows. (This was previously described as "mini-batch" in the Slurm
roadmap presentations.)

- New topology/ring and topology/torus3d topology plugins. These
implement a single-dimensional and three-dimensional topology respectively.

- Slurm REST API - Add support for creating/updating/removing
partitions, and for viewing the active slurmctld and slurmdbd
configurations.

- Dynamic Memory Resizing. A job can now release memory (and have the
cgroup limits updated) using 'scontrol update' while running. A new
"sbatch --mem-update=<margin>@<delay>" option can also automatically
reduce the memory limit to the current usage plus a given margin
percentage after a specified time.

- Add topology-based sorting for node ranks when using dynamic nodes
with the topology plugins. This is also available generically for
topology/flat (no topology) with a new alpha_step_rank option.

- Add an optimized single-node path through the scheduling logic for
increased performance.

- Expanded the openmetrics (Prometheus) nodes, partitions, and jobs
endpoints with gpu allocation statistics.

This is the first release candidate of the upcoming 26.05 release
series, and represents the end of development for this release, and a
finalization of the RPC and state file formats.

If any issues are identified with this release candidate, please report
them through https://support.schedmd.com against the 26.05.x version and
we will address them before the first production 26.05.0 release is made.

Please note that the release candidates are not intended for production use.

A preview of the updated documentation can be found at
https://slurm.schedmd.com/archive/slurm-master/ .

Slurm can be downloaded from https://github.com/SchedMD/slurm/releases.

The changelog for 26.05 can be found here:
https://github.com/SchedMD/slurm/blob/master/CHANGELOG/slurm-26.05.md

--
Tim Wickberg
Director, System Software, Slurm + Slinky, NVIDIA

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