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  1. JDK
  2. JDK-8272773

Configurable card table card size

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    • gc
    • b25

      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.

        1. specjbb2015-card-table-impact.ods
          20 kB
          Thomas Schatzl
        2. specjbb2015-card-table-size.png
          112 kB
          Thomas Schatzl
        1.
        		 Release Note: Configurable Card Table Card Size Sub-task Closed Thomas Schatzl  

            tschatzl Thomas Schatzl
            tschatzl Thomas Schatzl
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