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  1. JDK
  2. JDK-8232533

G1 uses only a single thread for pretouching the java heap

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 14
    • Fix Version/s: 14
    • Component/s: hotspot
    • Subcomponent:
      gc
    • Resolved In Build:
      b24

      Description

      In some recent SPECjbb2015 runs with -XX:+AlwaysPreTouch G1 used only a single thread for pretouching hundreds of GB of Java heap which takes a long time.

      Eg.

      [0.160s][debug][gc,heap ] Running G1 PreTouch with 1 workers for 420 work units pre-touching 450971566080B.
      [136.307s][debug][gc,heap ] Running G1 PreTouch with 1 workers for 6 work units pre-touching 7046430720B.
      [140.038s][debug][gc,heap ] Running G1 PreTouch with 1 workers for 6 work units pre-touching 7046430720B.
      [144.142s][debug][gc,heap ] Running G1 PreTouch with 1 workers for 1 work units pre-touching 880803840B.
      [144.400s][debug][gc,heap ] Running G1 PreTouch with 1 workers for 1 work units pre-touching 880803840B.
      [144.867s][debug][gc,heap ] Running G1 PreTouch with 1 workers for 1 work units pre-touching 880803840B.

      Fix this regression.

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              • Assignee:
                sangheki Sangheon Kim
                Reporter:
                tschatzl Thomas Schatzl
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                Dates

                • Created:
                  Updated:
                  Resolved: