Performance comparison of Java (and .NET) runtimes

Tue Oct 19 17:51:00 GMT 2004

Hi Bryce,
> > Performance Comparison of Java/.NET Runtimes (Oct 2004)
> > http://www.shudo.net/jit/perf/

> Cool, thanks for posting that. It would be good to understand why GCJ
> does so poorly on some of the SPEC JVM scores. Did you ever try it with
> -ffast-math and/or -march=pentium4? (also, perhaps -fno-bounds-check,
> but I guess that is cheating)

Now I tried those options and saw some amount of improvement.
The score of _222_mpegaudio improved 15% and the total score improved 4%.
[Only -O2]
 _227_mtrt 122
 _202_jess 87.0
 _201_compress 187
 _209_db 29.0
 _222_mpegaudio 375
 _228_jack 56.1
 _213_javac 103
[-O2 -march=pentium4 -ffast-math]
 _227_mtrt 125
 _202_jess 90.0
 _201_compress 190
 _209_db 29.3
 _222_mpegaudio 430
 _228_jack 56.7
 _213_javac 107
The version of the gcj I used is as follows:
 % gcj -v
 ...
 gcc version 3.4.2 20041017 (Red Hat 3.4.2-6)
 % rpm -q gcc-java
 gcc-java-3.4.2-6
 Kazuyuki Shudo	shudo@computer.org	http://www.shudo.net/