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  1. JDK
  2. JDK-8140793

getAvailableProcessors may incorrectly report the number of cpus in Docker container

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 8, 9
    • Fix Version/s: None
    • Component/s: hotspot
    • Labels:

      Description

      OperatingSystemMXBean.getAvailableProcessors should return the number of processors made available to the process. Docker can place limits on it.
      Mis-reporting the number can throw off heuristics for optimizing computations based on memory size and available processors.
      It is hinted that the number of processors reported from /proc on linux reports the hardware processors not those permitted to the process.

      sysconf(_SC_NPROCESSORS_CONF) may be more reliable in this case.

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              Assignee:
              Unassigned Unassigned
              Reporter:
              rriggs Roger Riggs
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