On Mon, 22 Apr 2024 10:34:29 GMT, Claes Redestad <redes...@openjdk.org> wrote:
> This switch expression in `Locale::createLocale` is causing a somewhat large > startup regression on my local system. Desugaring to if statements seem like > the right thing to do while we investigate ways to further reduce overheads > in `SwitchBootstraps`. > > These numbers are against a baseline which include #18865 and #18845, which > already improved the situation: > > > Name Cnt Base Error Test Error > Unit Change > Perfstartup-Noop 20 40,500 ± 1,942 31,000 ± 2,673 > ms/op 1,31x (p = 0,000*) > :.cycles 143254849,000 ± 3398321,355 102205427,650 ± 2192784,853 > cycles 0,71x (p = 0,000*) > :.instructions 307138448,850 ± 2095834,550 219415574,800 ± 376992,067 > instructions 0,71x (p = 0,000*) > :.taskclock 39,500 ± 1,942 22,500 ± 3,858 > ms 0,57x (p = 0,000*) > * = significant > > > Comparing to a baseline without those recent improvements the overhead was > almost the double: > > Name Cnt Base Error Test Error > Unit Change > Perfstartup-Noop 20 50,000 ± 0,000 31,000 ± 2,673 > ms/op 1,61x (p = 0,000*) > :.cycles 187047932,000 ± 3330400,381 102205427,650 ± 2192784,853 > cycles 0,55x (p = 0,000*) > :.instructions 408219060,350 ± 4031173,140 219415574,800 ± 376992,067 > instructions 0,54x (p = 0,000*) > :.taskclock 53,500 ± 4,249 22,500 ± 3,858 > ms 0,42x (p = 0,000*) > * = significant Marked as reviewed by alanb (Reviewer). ------------- PR Review: https://git.openjdk.org/jdk/pull/18882#pullrequestreview-2014569606
