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Find and cache remaining direct method handles #5879

headius opened this issue Sep 16, 2019 · 0 comments


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commented Sep 16, 2019

For #5874, one of the biggest savings in boot time came from caching a number of static method handles, usually acquired via Binder#invokeStaticQuiet. This covered most of the cases switched to using invokedynamic in that PR, but I did not audit other mechanisms for creating direct method handles.

At a minimum, we should audit all places we do the following, and try to cache these handles somewhere for reuse:

  • Binder.invokeStatic (non quiet)
  • Binder.invokeVirtual[Quiet]
  • MethodHandles.Lookup methods for acquiring DMH

With just the work in #5874, I reduced the startup time of non-dev-mode rails -h from 5.2s to 4.6s. We may see similar savings elsewhere, especially in full indy mode, by caching the other DMHs.

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