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local_affinity.md

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Using LocalAffinityManager (for pinning local workers to specific cores)

  • Linux only feature.
  • Requires the Linux taskset command to be installed.
  • Usage : addprocs(LocalAffinityManager(;np=CPU_CORES, mode::AffinityMode=BALANCED, affinities=[]); kwargs...).

where

  • np is the number of workers to be started.
  • affinities, if specified, is a list of CPU IDs. As many workers as entries in affinities are launched. Each worker is pinned to the specified CPU ID.
  • mode (used only when affinities is not specified, can be either COMPACT or BALANCED) - COMPACT results in the requested number of workers pinned to cores in increasing order, For example, worker1 => CPU0, worker2 => CPU1 and so on. BALANCED tries to spread the workers. Useful when we have multiple CPU sockets, with each socket having multiple cores. A BALANCED mode results in workers spread across CPU sockets. Default is BALANCED.