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  1. JDK
  2. JDK-8195117

Performance regressions from JDK-8186027

    Details

    • Subcomponent:
    • Introduced In Build:
      b36
    • Introduced In Version:
      10
    • CPU:
      sparc, x86_64
    • OS:
      linux, os_x, solaris

      Description

      Looks like JDK-8186027 is causing a few performance regressions:

      • ~ 1.5% in SPECjbb2005-G1 on Solaris-SPARC

      • 2-5% in SHA1PRNG crypto benchmarks on Linux-x64, Mac-x64, and Solaris-SPARC:
         • micro.benchmarks.crypto.small.SecureRandomBench.nextBytes-algorithm:SHA1PRNG-dataSize:64-provider:-shared:false
         • micro.benchmarks.crypto.small.SecureRandomBench.nextBytes-algorithm:SHA1PRNG-dataSize:64-provider:-shared:true

      Regressions hold at least through b39.

      Reproduces in triage (reproduction run on same machine).
      Reproduces in re-triage (reproduction run on different machine).
      VMswap results indicate the cause is in the JVM.

      Measurements of b36 using -XX:-UseCountedLoopSafepoints show the regressions go away. So the cause appears to be JDK-8186027

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              • Assignee:
                thartmann Tobias Hartmann
                Reporter:
                resii Robert Strout
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                Dates

                • Created:
                  Updated:
                  Resolved: