Java 7 Groovy twice as fast as Java 8 and 9

[Martijn Verburg]

Hi Richard,

Yes, that and other related issues.  Basically there was a lot changing in
Hotspot at the time (G1 GC interactions as well) and it wasn't really
deemed a stable improvement until 8

Cheers,
Martijn

On 17 February 2015 at 10:59, Richard Kolb <rjdkolb at gmail.com> wrote:

> 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.
> > >
> > >
> >
> >
> >
>