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  1. JDK
  2. JDK-8158919

Investigate better TLAB sizing for large VMs in G1

    Details

    • Type: Enhancement
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 9
    • Fix Version/s: tbd
    • Component/s: hotspot
    • Subcomponent:
      gc

      Description

      Some JFR measurements showed that by default, on a large VM (1 TB) of a customer a huge amount of allocation outside TLAB occur.

      Like a ~1hr JFR recording of only this event amounts to 2.3GB of data.

      There might be issues like we had with PLAB sizing on G1 (e.g. JDK-8030849/JDK-8067341; maybe there are issues with region boundaries and something like a "net PLAB size" would be helpful).

      Investigate and propose fixes.

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              • Assignee:
                Unassigned
                Reporter:
                tschatzl Thomas Schatzl
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                Dates

                • Created:
                  Updated: