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  1. JDK
  2. JDK-8309960

ParallelGC young collections very slow in DelayInducer

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      Description

        In the benchmark DelayInducer from JDK-8062128 Parallel GC young collections are extremely slow compared to G1.

        I.e. with -Xmn1g -Xms3g -Xmx3g on both collectors, G1 takes 130-360ms for young collections, Parallel GC young collections take 666-8863(!)ms.

        There seems to be a problem with the work queue/task stealing. See the attached logs showing task queue statistics; just compare the steal statistics (prefixed with "st-") where parallel gc looks extremely bad.

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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-8310136 ParallelGC young collections very slow in DelayInducer

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

            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-8310434 ParallelGC young collections very slow in DelayInducer

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

            Enhancement - null JDK-8300447 Parallel: Refactor PSPromotionManager::drain_stacks_depth

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

            Enhancement - null JDK-8310031 Parallel: Implement better work distribution for large object arrays in old gen

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

            Enhancement - null JDK-8339028 Re-evaluate workaround for very slow DelayInducer

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

            Enhancement - null JDK-8311163 Parallel: Improve large object handling during evacuation

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

            Enhancement - null JDK-8319205 Parallel: Reenable work stealing after JDK-8310031

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

            Commit Commit openjdk/jdk21/4d81b899

            Commit Commit openjdk/jdk/5f3613e0

            Review Review openjdk/jdk21/22

            Review Review openjdk/jdk/14469

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                ayang Albert Yang
                tschatzl Thomas Schatzl
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