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  1. JDK
  2. JDK-8059452

G1: Change the default values for G1HeapWastePercent and G1MixedGCLiveThresholdPercent

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 8u40, 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Subcomponent:
      gc
    • Resolved In Build:
      b35

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        Description

        When the flags G1HeapWastePercent and G1MixedGCLiveThresholdPercent were introduced their default values were picked without much performance analysis.

        Recent performance runs indicate that G1HeapWastePercent often benefit from a lower value and that G1MixedGCLiveThresholdPercent benefit from a higher value.

        Suggestion is to change the default for G1HeapWastePercent to 5 (used to be 10) and G1MixedGCLiveThresholdPercent to 85 (used to be 65).

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                • Assignee:
                  brutisso Bengt Rutisson (Inactive)
                  Reporter:
                  brutisso Bengt Rutisson (Inactive)
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                  • Created:
                    Updated:
                    Resolved: