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  1. JDK
  2. JDK-8043575

Dynamically parallelize reference processing work

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 11
    • 8u20, 9
    • hotspot
    • gc
    • b19

    Backports

      Description

        The reference processing phases can, depending on the number of soft references and the amount of retained objects take a significant amount of time.

        To decrease the duration of the phase it is possible to use the ParallelRefProcEnabled switch - however that needs to be done manually.

        The goal of this CR is to dynamically turn on parallel reference processing for the different gc phases.

        One way to do this is to estimate the amount of work as fraction of the total gc pause time, and if this crosses a threshold, enable parallel reference processing automatically.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8205870 Dynamically parallelize reference processing work

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

            Enhancement - null JDK-8205043 Make parallel reference processing default for G1

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

            Enhancement - null JDK-7068229 G1: Dynamically enable MT reference processing for remark pauses

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

            Enhancement - null JDK-8181214 ReferenceProcessor should shortcut execution on empty lists

            • P3 - Major loss of function.
            • Resolved
            is blocked by

            Bug - A problem which impairs or prevents the functions of the product. JDK-8204617 ParallelGC parallel reference processing does not set MT degree in reference processor

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

            Enhancement - null JDK-6938732 Ergonomify (parallel) reference processing

            • P3 - Major loss of function.
            • Open

            Enhancement - null JDK-8051680 (ref) unnecessary process_soft_ref_reconsider

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

            Enhancement - null JDK-8072498 Multi-thread JNI weak reference processing

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

            Enhancement - null JDK-8173211 G1: Enqueuing dirty cards during reference enqueuing in phase 3 does not scale

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

            Enhancement - null JDK-8173335 Improve logging for j.l.ref.reference processing

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

            Enhancement - null JDK-8204686 Dynamic parallel reference processing support for Parallel GC

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

            Enhancement - null JDK-8076462 Preserving the referents of concurrent mark work distribution method causes long pause times

            • P3 - Major loss of function.
            • Closed

            Enhancement - null JDK-7068229 G1: Dynamically enable MT reference processing for remark pauses

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

            Enhancement - null JDK-8203951 ReferenceProcessor::_has_adjustable_queue should be removed when CMS is obsoleted

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

            Enhancement - null JDK-8181214 ReferenceProcessor should shortcut execution on empty lists

            • P3 - Major loss of function.
            • Resolved

            JEP - Java Enhancement Proposal JDK-8172792 JEP 308: Improve Dynamic Number of Thread Sizing for G1

            • P3 - Major loss of function.
            • Closed

            Enhancement - null JDK-8078117 Refactor enqueue_discovered_references() and redirty_logged_cards() to share the same work gang.

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

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                tschatzl Thomas Schatzl
                tschatzl Thomas Schatzl
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                  Created:
                  Updated:
                  Resolved: