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  1. JDK
  2. JDK-8262074

Consolidate the default value of MetaspaceSize

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 17
    • Fix Version/s: 17
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b12

      Description

      MetaspaceSize (the setting determining the initial threshold to start off a metaspace-motivated GC) is both platform- and compiler-tier-dependent.

      In addition to that, it gets modified after Metaspace::ergo_initialize() ran and had its say on metaspace settings, in the compiler initialization:

      https://github.com/openjdk/jdk/blob/2b00367e1154feb2c05b84a11d62fb5750e46acf/src/hotspot/share/compiler/compilerDefinitions.cpp#L194-L196

      which causes confusion and test errors like these: JDK-8261907 , JDK-8261907

      The reasons for this are not perfectly clear and seem to originate from PermGen times:

      https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2021-February/045536.html

      Re-check if these dependencies are still needed post JEP-387. At least the platform dependencies don't seem to be useful. Compiler-dependencies may be useful since the number of MethodCounters (which live in Metaspace) are dependend on compiler tier.

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              Assignee:
              stuefe Thomas Stuefe
              Reporter:
              stuefe Thomas Stuefe
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                Updated:
                Resolved: