[fedora-java] Using the natively-built Eclipse compiler

[Ziga Mahkovec]

On Wed, 2005-03-09 at 11:38 -0500, Thomas Fitzsimmons wrote:
> On Wed, 2005-03-09 at 15:04 +0000, Andrew Haley wrote:
> >I see.  Of course, I have no idea why tools.jar is attempting to use
> >the gcjlib:// class loader, or why it is so slow when it does.  It
> >really should not explicitly use this class loader.
> 
> I doesn't any more.  We were doing that to avoid having to always add
> jdtcore.jar to the classpath.  I also have no idea why it's so slow but
> I did notice a significant performance hit when compared to interpreted
> mode.
> 
> Ziga, you can get the sources for java-gcj-compat from
> sources.redhat.com:

Ah, much better, thanks.  Here are the revised times (BTW, that's a
1.5GHz Pentium M):

HelloWorld

ecj                |  ecj-native         |  jikes
-------------------------------------------------------------
real    0m1.863s   |  real    0m1.614s   |  real    0m0.067s
user    0m1.758s   |  user    0m1.536s   |  user    0m0.050s
sys     0m0.103s   |  sys     0m0.076s   |  sys     0m0.012s


GNU Classpath (cd lib; make)

ecj                |  ecj-native         |  jikes
-------------------------------------------------------------
real    1m24.539s  |  real    0m24.552s  |  real    0m9.439s
user    1m23.157s  |  user    0m23.047s  |  user    0m7.486s
sys     0m1.142s   |  sys     0m1.139s   |  sys     0m0.771s


Note that classpath sources need a tiny hack to keep ecj from crashing.
But that looks like an upstream Eclipse bug, since I could reproduce it
running ecj with java-1.5.0-sun.

Andrew, I don't suppose you still need oprofile data (or are there other
places where gcjlib:// loading might be a problem)?

-- 
Ziga