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  1. JDK
  2. JDK-8214496

TieredCompilation seems to cause 50% fluctuation in micro score

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    • Subcomponent:
    • CPU:
      x86_64
    • OS:
      linux

      Description

      I have a JMH that acts like this, where the slower 854.109 ms/op is more common.

      # Run progress: 0.00% complete, ETA 00:02:30
      # Fork: 1 of 5
      # Warmup Iteration 1: 441.124 ms/op
      # Warmup Iteration 2: 415.528 ms/op
      Iteration 1: 385.257 ms/op

      # Run progress: 20.00% complete, ETA 00:02:32
      # Fork: 2 of 5
      # Warmup Iteration 1: 854.109 ms/op
      # Warmup Iteration 2: 827.729 ms/op
      Iteration 1: 828.441 ms/op

      With -XX:-TieredCompilation, the score is steady in the faster 400 ms/op.

      I'm running 12-b19 but I can cause this going back to jdk-10 too.

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            • Assignee:
              Unassigned
              Reporter:
              ecaspole Eric Caspole
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              • Created:
                Updated: