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  1. JDK
  2. JDK-8259349

-XX:AvgMonitorsPerThreadEstimate=1 does not work right

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Details

    • Bug
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • 16
    • 17
    • hotspot
    • b05
    • generic
    • generic

    Description

      The AvgMonitorsPerThreadEstimate option does not work quite
      right when trying to use a value lower than the default of 1024.

      The _in_use_list_ceiling variable is statically initialized to
      AvgMonitorsPerThreadEstimate and that happens before
      cmd line options are processed. So when you try to use
      -XX:AvgMonitorsPerThreadEstimate=1 you end up with an
      _in_use_list_ceiling of 1024 + <#-of-JavaThreads>. I see
      an _in_use_list_ceiling of 1034 in some of the testing that
      I'm doing for JDK-8226416.

      Attachments

        Issue Links

          blocks

          Enhancement - null JDK-8226416 MonitorUsedDeflationThreshold can cause repeated async deflation requests

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          duplicates

          Enhancement - null JDK-8256307 cleanup AvgMonitorsPerThreadEstimate and _in_use_list_ceiling types

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8263446 Avoid unary minus over unsigned type in ObjectSynchronizer::dec_in_use_list_ceiling

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8253064 monitor list simplifications and getting rid of TSM

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8256307 cleanup AvgMonitorsPerThreadEstimate and _in_use_list_ceiling types

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          links to

          Commit Commit openjdk/jdk/c338f116

          Review Review openjdk/jdk/1992

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              dcubed Daniel Daugherty
              dcubed Daniel Daugherty
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              Dates

                Created:
                Updated:
                Resolved: