Java 7 Groovy twice as fast as Java 8 and 9

[Chris Newland]

Hi Richard,

I'll run this through JITWatch [1] later and see if there is anything
obvious.

Have you considered that with 8 and 9 you're probably hitting tiered
compilation (disabled by default in 7) which means you're running on
"quick-and-dirty" C1 optimisation for part of your benchmark.

If your benchmark doesn't run for long enough for C2 to kick in then that
could be a simple reason.

Cheers,

Chris

[1] https://github.com/AdoptOpenJDK/jitwatch/

On Tue, February 17, 2015 06:18, Richard Kolb wrote:
> 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/co
> m/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.
>
>