Job Limits

Each LC platform is a shared resource. Users are expected to adhere to the following usage policies to ensure that the resources can be effectively and productively used by everyone. You can view the policies on a system itself by running either:

joblimits
news job.lim.MACHINENAME

Web version of Bengal Job Limits

There are 5 available machines on the SCF. Please consider your needs to decide which machine is best for your flavor of work.

• Bengal—a machine for small to large jobs (24 hr job limit)
• Mica—a small machine for debugging (8hr job limit)
• Jadeita—a machine for small jobs
• Magma—a machine for small to medium jobs
• Jade—a machine for large jobs (4 jobs/user limit)

Bengal is now in Limited Availability mode and all jobs are scheduled per node in one pool. Remember you can run using the guests bank to get additional resources. Use of the guests bank will not impact your metal bank priority.

Hardware

Each Bengal node is based on Intel Sapphire Rapids processor with 56 cores per socket, 2 sockets per node, and 256 GB DDR5 memory.

Scheduling

• pdebug—40 nodes (4,480 cores), interactive use only.
• pbatch—1072 nodes (120,064 cores), batch use only.

Pools               Max nodes/job       Max runtime
---------------------------------------------------
pdebug                    20(*)            1 hour
pbatch                   110(**)          36 hours
---------------------------------------------------

(*) pdebug is intended for debugging, visualization, and other inherently interactive work.  It is NOT intended for production work. Do not use pdebug to run batch jobs.  Do not chain jobs to run one after the other. Individuals who misuse the pdebug queue in this or any similar manner will be denied access to running jobs in the pdebug queue.

Pdebug is core scheduled. To allocate whole nodes, add a '--exclusive' flag to your sbatch or salloc command.

(**) pbatch is for large jobs.

•    Jobs are node scheduled
•    There is a limit of 110 nodes per user at any one time

Interactive access to a batch node is allowed only while you have a batch job running on that node, and only for the purpose of monitoring your job. When logging into a batch node, be mindful of the impact your work has on the other jobs running on the node.

SBATCH SCRIPT:  #SBATCH  -n  number_of_cores

ALWAYS use the sbatch -n option when your job will use more than one task.