What does the hbm mean here in Slurm config GresTypes=hbm,gpu?

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In Slurm, GRES (Generic Resource) is a mechanism to specify the type and number of hardware resources required for a job to run, such as GPUs, InfiniBand adapters, or high-bandwidth memory (HBM).

So, the hbm in GresTypes=hbm,gpu refers to the high-bandwidth memory and indicates that the Slurm cluster has GRES resources for both GPUs and HBM, which can be requested by a job using the --gres option with the hbm or gpu keyword.