Java 7 Groovy twice as fast as Java 8 and 9

[Richard Kolb]

Hi Chris

Looks like you are correct.
If I run the beanchmarks though Java 8 :'java -XX:TieredStopAtLevel=1 -jar
benchmarks.jar'
I get significant improvement
(-XX:+TieredCompilation does not seem to have as much effect by itself)

I assume it is turned off because of this
<http://bugs.java.com/view_bug.do?bug_id=7159766> ?

regards,
Richard
.

On 17 February 2015 at 11:54, Chris Newland <cnewland at chrisnewland.com>
wrote:

> 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.
> >
> >
>
>
>