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  1. JDK
  2. JDK-8253765

C2: Control randomization in StressLCM and StressGCM

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 16
    • Fix Version/s: 16
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b20

      Description

      StressLCM and StressGCM use a global random number generator, which makes it difficult to repeat a certain execution (for example, for debugging purposes) in the face of concurrent method compilations. They could instead use the compilation-local random generator (Compile::random()) introduced in JDK-8252219 for StressIGVN, which introduces more variability (as it initializes the seed differently in each run) while making stress runs repeatable.

      Note that this would affect the default behavior of StressLCM and StressGCM, as Compile::random() is initialized differently in each run by default (unless StressSeed is used).

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          Issue Links

          relates to

          Enhancement - null JDK-8270156 Add "randomness" and "stress" keys to JTreg tests which use StressGCM, StressLCM and/or StressIGVN

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8254602 compiler/debug/TestStressCM.java failed with "RuntimeException: got the same optimization stats for different seeds: expected 45"

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

          Enhancement - null JDK-8009120 Fuzz instruction scheduling in HotSpot compilers

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

          Enhancement - null JDK-8252219 C2: Randomize IGVN worklist for stress testing

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

          Enhancement - null CODETOOLS-7902768 jcstress should support -XX:+StressIGVN

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

          Commit Commit openjdk/jdk/05459df0

          Review Review openjdk/jdk/572

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              Assignee:
              rcastanedalo Roberto Castaneda Lozano
              Reporter:
              rcastanedalo Roberto Castaneda Lozano
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                Updated:
                Resolved: