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  1. JDK
  2. JDK-8263864

~17% regression for DaCapo h2 after JDK-8253064

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Details

    • Bug
    • Status: Closed
    • P4
    • Resolution: Duplicate
    • 16, 17, 18
    • 18
    • hotspot

    Description

      All GCs (Serial, Parallel, G1, Shenandoah, Z) are effected; 15-20% regression for different GCs.

      ```
      java -Xms4g -Xmx4g -jar dacapo-9.12-MR1-bach.jar h2 -s huge -t 1 -n 1
      ```

      Example of output using G1:

      Before
      ===== DaCapo 9.12-MR1 h2 PASSED in 124958 msec =====

      After
      ===== DaCapo 9.12-MR1 h2 PASSED in 151726 msec =====

      So far the regression is observed only on Intel, but not on AMD.

      More testing shows that this regression is only for single thread. If I use more threads (e.g. -t 2), the regression seems to go away.

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              eosterlund Erik Ă–sterlund
              ayang Albert Yang
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                Created:
                Updated:
                Resolved: