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  1. JDK
  2. JDK-8227665

Clearing collection set candidates takes a significant amount of time

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Details

    • Enhancement
    • Resolution: Duplicate
    • P4
    • tbd
    • 12, 13, 14
    • hotspot
    • gc

    Description

      After a mixed gc phase we clear the remembered sets of collection set candidates serially.

      This may take a significant amount of time (BigRAMTester@50G heap@32M regions ~70ms; BigRAMTester@50G heap@1M regions ~800ms) every time at the last mixed gc in a mixed gc phase.

      This started to show up with JDK13 after the refactoring in JDK-8218668 as high "Other" time, but has been a problem since introduction in JDK-8190269.

      Parallelize in some way.

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        Issue Links

          duplicates

          Enhancement - null JDK-8017163 G1: Refactor remembered sets

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved
          relates to

          Enhancement - null JDK-8218668 Clean up evacuation of optional collection set

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

          JEP - Java Enhancement Proposal JDK-8190269 JEP 344: Abortable Mixed Collections for G1

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8152948 More unaccounted other time on large machines

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8227671 G1: assert_used_and_recalculate_used_equal performs work in product builds

          • P3 - Major loss of function.
          • Resolved

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              Unassigned Unassigned
              tschatzl Thomas Schatzl
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              Dates

                Created:
                Updated:
                Resolved: