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  1. JDK
  2. JDK-8309960

ParallelGC young collections very slow in DelayInducer

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    • gc
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        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.

          1. delayinducer-g1.txt
            16 kB
            Thomas Schatzl
          2. delayinducer-parallel.txt
            24 kB
            Thomas Schatzl
          3. delayinducer-parallel-jdk20.txt
            1.0 kB
            Thomas Schatzl
          4. delayinducer-parallel-jdk21.txt
            1.0 kB
            Thomas Schatzl

              ayang Albert Yang
              tschatzl Thomas Schatzl
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