RFR: 8287785: Reduce runtime of java.lang.invoke microbenchmarks

[liach]

On Fri, 3 Jun 2022 11:16:29 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> - Add explicit run configurations to java.lang.invoke micros, aiming to reduce runtime while maintaining a decently high confidence that there's enough warmup to produce good enough data.
> 
> - Remove several trivial baseline micros, mainly those that only return a static object: It's reasonable to have baseline microbenchmarks when the baseline op is complex and you're mostly interested in checking the overhead of doing the same thing via some MH API, but blackhole operations are now shortcutting very quickly and timings doesn't differ from one type of object to another, so we don't need a multitude of such baseline tests.
> 
> Estimated runtime of `make test TEST=micro:java.lang.micro` (excluding build) drops from just above 28 to just above 3 hours.

test/micro/org/openjdk/bench/java/lang/invoke/LookupAcquire.java line 59:

> 57:     @Setup
> 58:     public void setup() {
> 59:         cached = MethodHandles.lookup();

Since the benchmark using the cached object is removed, should this field be removed as well?

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

PR: https://git.openjdk.java.net/jdk/pull/9012