Pinning

Overview

Questions

• What is “pinning” of job resources?
• How can pinning improve the performance?
• How can I see, if pinning resources would help?
• What requirement hints can I give to the scheduler?

Objectives

After completing this episode, participants should be able to …

• Define the concept of “pinning” and how it can affect job performance.
• Name Slurms options for memory- and cpu- binding.
• Use hints to tell Slurm how to optimize their job allocation.

Binding / pinning:

• --mem-bind=[{quiet|verbose},]<type>
• -m, --distribution={*|block|cyclic|arbitrary|plane=<size>}[:{*|block|cyclic|fcyclic}[:{*|block|cyclic|fcyclic}]][,{Pack|NoPack}]
• --hint=: Hints for CPU- (compute_bound) and memory-bound (memory_bound), but also multithread, nomultithread
• --cpu-bind=[{quiet|verbose},]<type> (srun)
• Mapping of application <-> job resources

Why what how?

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B

Summary

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Leading question: Pinning is very specific, but was it really limiting the performance of out application? How can I identify the biggest issue?

Key Points

• C