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  1. JDK
  2. JDK-8231579

G1's incremental calculation of region elapsed time always uses the same age group for prediction

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    • gc
    • b26

    Description

      G1 calculates the time it takes to evacuate the contents of a mutator region as they are retired.

      At this time G1 always uses the same region predictor to calculate that amount for all mutator regions.

      This typically results in mispredicting the time as objects in different regions have different predictions. This makes the amount of time left for old gen evacuation wrong during mixed gc, resulting in bad actual pause times.

      This seems to be a day one bug.

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          blocks

          Enhancement - null JDK-8234336 Improve G1 per-region predictions by discounting waste

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

          Enhancement - null JDK-8233588 Clean up SurvRateGroup

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

          Enhancement - null JDK-8233919 Incrementally calculate the occupied cards in a heap region remembered set

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

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              tschatzl Thomas Schatzl
              tschatzl Thomas Schatzl
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                Updated:
                Resolved: