On Mar 30, 2013, at 1:56 AM, Charles Oliver Nutter <head...@headius.com> wrote:
> I've been fiddling about with performance a bit again recently, and have > noticed a perf degradation since b72. I mentioned this to the Nashorn guys > and Marcus discovered that InlineSmallCode=2000 helped them get back to b72 > performance. I can confirm this on JRuby as well, but in any case it seems > that something has regressed. > > Here's some numbers with JRuby. Numbers are for b72, hotspot-comp, and > hotspot-comp with InlineSmallCode=2000. You can see that current hotspot-comp > builds do not perform as well as b72 unless that flag is passed. > > https://gist.github.com/headius/de7f99b52847c2436ee4 > > I have not yet started to explore the inlining or assembly output, but I > wanted to confirm that others are seeing this degradation. > > My build of hotspot-comp is current. > > I do have some benchmarks that look fine without the additional flag > (neural_net, for example), so I'm confused what's different in the degraded > cases. I'm not sure if Marcus talked to you already about this but there are two fixes that caused this regression: 1. http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8007439 which was fixed by: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8010222 in HS25-b24. 2. We turned off tiered compilation: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8005811 The InlineSmallCode=2000 is a way to work around the tiered slowdown. -- Chris > > - Charlie > _______________________________________________ > mlvm-dev mailing list > mlvm-dev@openjdk.java.net > http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
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