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  1. JDK
  2. JDK-8272773

Configurable card table card size

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    • Subcomponent:
      gc
    • Resolved In Build:
      b25

      Description

      A card in the card table currently has a fixed constant size of 512 bytes for forever.

      This can impact pause time significantly in g1 as it needs to clear the young gen card table in the pause.

      If you increase the card table entry size, there may be significant savings on that time when the amount of regions the card table has to be cleared is large, as the attached spreadsheet shows for specjbb2015.

      See what the impact on other applications and garbage collectors is when increasing the card table size, effectively making it startup time configurable.

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              Assignee:
              tschatzl Thomas Schatzl
              Reporter:
              tschatzl Thomas Schatzl
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