Java 7 Groovy twice as fast as Java 8 and 9

[Richard Kolb]

Hello All,

I've created my own micro beanchmarks with jmh.
It's forked to here :
https://github.com/AdoptOpenJDK/vmbenchmarks

Most of the benchmarks clearly show how performance is increasing except
for Groovy.
https://github.com/AdoptOpenJDK/vmbenchmarks/blob/master/src/main/java/com/github/vmbenchmarks/DynamicLanguages.java

Perhaps my benchmark is wrong, but it looks like 8 and 9 are significantly
slower than 7.

Java 7 (build 1.7.0_60-b19):
c.g.v.DynamicLanguages.groovy 665.826 ops/s

Java 8 (build 1.8.0_31-b13):
c.g.v.DynamicLanguages.groovy 366.274

Java 9 (build 1.9.0-ea-b42) :
c.g.v.DynamicLanguages.groovy 375.593 ops/s

regards,
Richard.