RFR: JDK-8286666: JEP 429: Implementation of Scoped Values (Incubator) [v14]

[Andrew Haley]

On Wed, 16 Nov 2022 19:04:29 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Probably so, yes. I'll have a look at that along with caching failure.
>
> So I just did the experiment of caching failures and the result of `isBound()`.
> 
> This test:
> 
> 
>     @Benchmark
>     @OutputTimeUnit(TimeUnit.NANOSECONDS)
>     public int thousandMaybeGets(Blackhole bh) throws Exception {
>         int result = 0;
>         for (int i = 0; i < 1_000; i++) {
>             if (ScopedValuesData.sl1.isBound()) {
>                 result += ScopedValuesData.sl1.get();
>             }
>         }
>         return result;
>     }
> 
> 
> 
> Before and after:
> 
> 
> ScopedValues.thousandMaybeGets       avgt   10  13436.112 ± 20.885  ns/op
> ScopedValues.thousandMaybeGets       avgt   10     56.315 ± 0.583  ns/op
> 
> 
> You may have a point. The experiment is on a branch  called `JDK-8286666-cache-queries` in [My personal repo](https://github.com/theRealAph/jdk).
> 
> I'd push it now but it's getting a bit late to make such changes now. WDYT?

Fixed.

-------------

PR: https://git.openjdk.org/jdk/pull/10952