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  1. JDK
  2. JDK-8225229

Shenandoah: trim down default number of GC threads

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Details

    • Enhancement
    • Resolution: Fixed
    • P3
    • 13
    • 8-shenandoah, 11-shenandoah, 13
    • hotspot
    • gc
    • b24

    Backports

      Description

        We can trim down the default number of GC threads to make Shenandoah more cooperative with the application and OS scheduler. We routinely trim down concurrent threads to 2..4 when deploying, and better default would make deployment stories simpler.

        NB: ZGC sets 0.6*CPU for parallel and 0.125*CPU for concurrent threads.

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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-8225972 Shenandoah: trim down default number of GC threads

            • P3 - Major loss of function.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8231932 Shenandoah: conc/par GC threads ergonomics overrides user settings

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

            Enhancement - null JDK-8233850 Shenandoah: Shenandoah thread count ergonomics should be container aware

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

            Enhancement - null JDK-8240511 Shenandoah: parallel safepoint workers count should be ParallelGCThreads

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

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                shade Aleksey Shipilev
                shade Aleksey Shipilev
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                  Created:
                  Updated:
                  Resolved: