--- Michael Meyer <mike65134@(protected):
> --- Steve Loughran <stevel@(protected):
> > this is really interesting. I'd thought javac was
> > unthreaded too, but
> > even so you'd expect file IO to work in the other
> > CPU, so get a boost
> > from the second core.
> >
> > what happens when you try a different javac, like
> > the eclipse one?
>
> I have timed a very short compile run with different
> JDKs on the same machine,
> using the same OS one time with both cores enabled,
> the other time with only
> one core enabled.
>
> Result: the compile run using only one core was
> significantly faster than the
> one using both cores. This is true with every JDK I
> tried.
>
> So this might be an ant specific phenomenom? Maybe
> ant
> is spawning threads?
.....

I did another test with a little bit more source code
to compile (3 KLOC) in order to make sure that the
effect isn't solely the startup of the java vm.

Sun Java 6 Update 4:

1 core:
real  0m2.346s
user  0m2.220s
sys  0m0.072s

2 cores:
real  0m4.013s
user  0m6.980s
sys  0m0.192s

A rather dramatic difference!?!?






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