Linux / CFS: How do cgroupsv1 cpu.share / cgroupsv2 cpu.weight and nice process weights interact

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I was wondering how cgroup cpu shares/weights (v1: cpu.shares or v2: cpu.weight) and the niceness value of a task do interact in Linux with the CFS (Completely Fair Scheduler). Both values have an influence on the weighting of process relative to other processes.



The questions is: What happens if you mix the two concepts?



  1. Are the two weights multiplied/mixed?

  2. Are cgroup shares respected in the first order and the niceness values only applied to resource conflicts in the same cgroup?

  3. Some other model I cannot imagine.

Example: If I have a single process in a cgroup and all other processes in another cgroup. Both cgroups have cpu.shares/weight set to an arbitrary value. Does the nice value of the single process influence the absolute weight of the single cgroup process relative to the other processes?




scheduling cgroups nice




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    I was wondering how cgroup cpu shares/weights (v1: cpu.shares or v2: cpu.weight) and the niceness value of a task do interact in Linux with the CFS (Completely Fair Scheduler). Both values have an influence on the weighting of process relative to other processes.



    The questions is: What happens if you mix the two concepts?



    1. Are the two weights multiplied/mixed?

    2. Are cgroup shares respected in the first order and the niceness values only applied to resource conflicts in the same cgroup?

    3. Some other model I cannot imagine.

    Example: If I have a single process in a cgroup and all other processes in another cgroup. Both cgroups have cpu.shares/weight set to an arbitrary value. Does the nice value of the single process influence the absolute weight of the single cgroup process relative to the other processes?




    scheduling cgroups nice




    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I was wondering how cgroup cpu shares/weights (v1: cpu.shares or v2: cpu.weight) and the niceness value of a task do interact in Linux with the CFS (Completely Fair Scheduler). Both values have an influence on the weighting of process relative to other processes.



      The questions is: What happens if you mix the two concepts?



      1. Are the two weights multiplied/mixed?

      2. Are cgroup shares respected in the first order and the niceness values only applied to resource conflicts in the same cgroup?

      3. Some other model I cannot imagine.

      Example: If I have a single process in a cgroup and all other processes in another cgroup. Both cgroups have cpu.shares/weight set to an arbitrary value. Does the nice value of the single process influence the absolute weight of the single cgroup process relative to the other processes?




      scheduling cgroups nice




      share|improve this question














      I was wondering how cgroup cpu shares/weights (v1: cpu.shares or v2: cpu.weight) and the niceness value of a task do interact in Linux with the CFS (Completely Fair Scheduler). Both values have an influence on the weighting of process relative to other processes.



      The questions is: What happens if you mix the two concepts?



      1. Are the two weights multiplied/mixed?

      2. Are cgroup shares respected in the first order and the niceness values only applied to resource conflicts in the same cgroup?

      3. Some other model I cannot imagine.

      Example: If I have a single process in a cgroup and all other processes in another cgroup. Both cgroups have cpu.shares/weight set to an arbitrary value. Does the nice value of the single process influence the absolute weight of the single cgroup process relative to the other processes?





      scheduling cgroups nice





      share|improve this question













      share|improve this question




      share|improve this question








      edited Dec 19 '17 at 13:54

























      asked Dec 14 '17 at 18:24









      Till Schäfer

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