On Fri, 1 Jul 2022 20:39:49 GMT, Сергей Цыпанов <d...@openjdk.org> wrote:
>> @Stable is only effective if the path leading to @Stable value can be >> constant-folded by JIT. In above test, you have an instance field Method >> method. This can not be constant-folded, so neither can @stable fiels in the >> Field object, nor array elements of a @stable array. You should replace that >> with "static final Method method = ..." and re-run the test. > > With `static` and without `@Stable` the benchmark yields > > Benchmark Mode Cnt Score Error Units > AccessParamsBenchmark.getParameter0 avgt 10 1,212 ± 0,083 ns/op > AccessParamsBenchmark.getParameters avgt 10 2,493 ± 0,076 ns/op > > and with `@Stable` > > Benchmark Mode Cnt Score Error Units > AccessParamsBenchmark.getParameter0 avgt 40 0,427 ± 0,007 ns/op > AccessParamsBenchmark.getParameters avgt 40 2,123 ± 0,052 ns/op > > so the annotation is useful. hmm, is the faster getParameters (without explicit index access) a result of the annotation? getParameter0 shows the documented effect but isn't quite our use case here. ------------- PR: https://git.openjdk.org/jdk/pull/9143
