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  1. JDK
  2. JDK-8165313

Inserting freed regions during Free Collection Set serial phase takes very long on huge heaps

    Details

    • Subcomponent:
      gc
    • Resolved In Build:
      b138
    • Verification:
      Not verified

      Description

      The serial part to free the collection set on huge heaps with a very large collection set is very slow.

      E.g.

      Free collection Set: 430.7ms
        Free collection set serial: 421.2ms
        Young Free collection set: ... Avg. 4.2 ... Workers: 213
        Non-young free collection set: skipped

      Heap size: 1.5TB (49152 total regions), eden size: 11793->0, survivor size: 5007->5007, old 871 -> 871, humongous: 16 -> 16

      The problem is that inserting free regions in the free list without any ordering takes very long due to being and O(n^2) operation.

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              • Assignee:
                tschatzl Thomas Schatzl
                Reporter:
                tschatzl Thomas Schatzl
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                • Created:
                  Updated:
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