Stampede3 Queues

On Stampede3, you specify a queue by specifying the node type to be used and, where possible, a special case of the node, such a large-memory, or development.

• nvdimm

  • Ice Lake Large Memory Nodes NVDIMM

• icx

  • Ice Lake Compute Nodes ICX

• spr

  • Sapphire Rapids Compute Nodes SPR

• pvc

  • Ponte Vecchio Compute Nodes PVC

• skx

  • Skylake Compute Nodes SKX

• skx-dev

  • Skylake Compute Nodes – Developer Queue SKX

  • Development queue used for testing.

  • Maximum time limit of 2 hours

  • Wait times for development queue are very low.

skx-dev Queue (Development / Testing Queue)

The skx-dev queue is a special development queue intended for short testing and debugging runs, not production workloads. It enforces strict limits to ensure fair access: you may run only one job at a time, and you may have at most two jobs total in the queue (one running and one waiting). If you submit additional jobs beyond this limit, they do not immediately enter the scheduler’s queue. Instead, they remain in a blocked state — effectively sitting in a “queue outside the queue” — and will only be admitted once space becomes available.

This queue is ideal for validating scripts, testing resource requests, debugging MPI or launcher behavior, and confirming job configuration before scaling up to larger production queues.

Production Queues at TACC – Limits on Stampede3

Below are the current (2025) Queue limits. These limits are subject to change without notice.more

Queue Name	Node Type	Max Nodes per Job (assoc’d cores)	Max Duration	Max Jobs in Queue	Charge Rate (per node-hour)
nvdimm	ICX	1 node (80 cores)	48 hrs	3	4 SUs
icx	ICX	32 nodes (2560 cores)	48 hrs	12	1.5 SUs
spr	SPR	32 nodes (3584 cores)	48 hrs	24	2 SUs
pvc	PVC	4 nodes (384 cores)	48 hrs	2	3 SUs
skx	SKX	256 nodes (12288 cores)	48 hrs	40	1 SU
skx-dev	SKX	16 nodes (768 cores)	2 hrs	1	1 SU

Production Queue Status

You can view the current status of each queue by accessing the TACC portal. You may need to log in.