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• Synopsis: cgroup.cpuset.exclude_cpus
• Detail: Allow administrator to exclude cores from being assigned to jobs by adding numeric entries to a JSON list within the cpuset section of the cgroup hook configuration file. This setting impacts the creation of vnodes when vnode_per_numa_node is set to true. When vnodes are created, their core count (resources_available.ncpus) is reduced accordingly. This setting has no effect on the natural vnode when When vnode_per_numa_node is set to falsefalse, the excluded CPUs apply to the node itself. The core count (resources_available.ncpus) of the node itself is reduced in this case.
• Default: Empty list, no CPUs excluded

• Example:

  Code Block
  title exclude_cpus
  "cpuset" : { "enabled" : true, "exclude_cpus" : [0, 8], "exclude_hosts" : ["node004"], "exclude_vntypes" : ["green_node"] },

  
  

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• Synopsis: cgroup.cpuset.mem_fences
• Detail: Allow administrator to prevent cgroup hook from binding jobs to NUMA nodes. This prevents the hook from writing values to cpuset.mems in the cpuset subsystem.
• Default: True, cgroup hook will write values to cpuset.mems.

• Example:

  Code Block
  title excludemem_cpusfences
  "cpuset" : { "enabled" : true, "mem_fences" : true, "exclude_hosts" : ["node004"], "exclude_vntypes" : ["green_node"] },

  
  

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• Synopsis: cgroup.cpuset.mem_hardwall
• Detail: Allow administrator to override the value of cpuset.mem_hardwall. The RedHat documentation discribes this as:

  cpuset.mem_hardwall

  contains a flag (0 or 1) that specifies whether kernel allocations of memory page and buffer data should be restricted to the memory nodes specified for the cpuset. By default (0), page and buffer data is shared across processes belonging to multiple users. With a hardwall enabled (1), each tasks' user allocation can be kept separate.

• Default: False (zero)

• Example:

  Code Block
  title excludemem_cpushardwall
  "cpuset" : { "enabled" : true, "mem_hardwall" : false, "exclude_hosts" : ["node004"], "exclude_vntypes" : ["green_node"] },

  
  

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• Synopsis: cgroup.cpuset.memory_spread_page
• Detail: Allow administrator to override the value of cpuset.memory_spread_page. The RedHat documentation discribes this as:

  cpuset.memory_spread_page

  contains a flag (0 or 1) that specifies whether file system buffers should be spread evenly across the memory nodes allocated to the cpuset. By default (0), no attempt is made to spread memory pages for these buffers evenly, and buffers are placed on the same node on which the process that created them is running.

• Default: False (zero)

• Example:

  Code Block
  title excludememory_spread_cpuspage
  "cpuset" : { "enabled" : true, "memory_spread_page" : false, "exclude_hosts" : ["node004"], "exclude_vntypes" : ["green_node"] },

  
  

Upgrading PBS Pro with cgroup hook:

• Migrating from versions of PBS Pro prior to 18.2 on systems that utilize systemd will leave behind subdirectories that the older cgroups hook had created.
• The presence of these directories is not harmful to newer versions of the cgroups hook.
• These directories will no longer be present after a reboot. The cgroups hook creates new directories when the exechost_startup event is handled.

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