Re: [Java-gnome-developer] JVM benchmarks: kaffe takes the cake

[Tiago C. <cog...@li...>]

On Qua, 2003-11-12 at 11:27, Clemens Eisserer wrote:
> Hi Tiago!
>=20
> Your benchmarks ment nice, but they are not really useful.
>=20
> 1.) What does the *9, *3 mean for memory-consumption?
> Have you ever heard of threads? Threads are under Linux(o.k., thats not=
=20
> really correct) processes that share stuff between. That means Sun=B4s =
JVM=20
> does need 7,5% of your memory, not 67,5%.
Thanks for clearing this up, i did know that threads under sun JVM
appear as processes, i did not know about the shared memory issue, but
still Kaffe is the winner in this field, it has 6,5% while sun's JVM has
a 7.5% consumption

>=20
> 2.) Your startup-results seem that you=B4ve started the JVMs already, n=
ot=20
> really fair, because JVMs like Sun=B4s one need to load a lot of shared=
=20
> stuff. It would be fair to measure with and without haveing started it=20
> before and listing both values.
Don't the other JVM's load shared libs too? How do i control this?
=20
>=20
> 3.) You forgot a really important point: Execution speed.
> GIJ wasnt designed to be fast, it runs java-code only in interpreted=20
> mode, because it was ment to be a way for GCJ to load dynamically=20
> classes. Kaffe has two fifferent JITs.
> IBMs JVM is the fastest one, when only measuring execution speed. -> 10=
0%
> After IBM theres Sun. -> 90%
> after Sun theres kaffe ->25-45%
> after kaffe theres GIJ -> 5-10%
>=20
> However these percentages are not 100% correct and depend heavily on=20
> what you do with the VMs.
>=20
> However IBMs VM is based on Suns classes, that means Kaffe is the=20
> fastest OPenSource-JVM laying arround. Suns&IBMs JVMs are as fast or=20
> faster than GCJ, which compiles java statically. Even GCJ developers=20
> commented that Sun-JVM is impressive!
I did not forgot, i just didn't measured this. Yet from what I've seen
it seems that GCJ is faster then Kaffe:
http://klomp.org/mark/free-vm-benchmarks/
http://www.shudo.net/jit/perf/

>=20
> 4.)
>  > better choice then Sun's java. This makes you wonder how good is Sun
>  > investing in the Linux platform.
> Sun is currently rewriting their whole Java2D/x11 rendering pipeline.
> They will use OpenGL starting from 1.5 for drawing things. I=B4ve spoke=
n=20
> with a Java2D-enginier and he told me that the results are impressive.
> If Linux would not matter, they wouldnt spend so much time improving it=
=20
> on Linux/Desktop.
If that is really going to happen then it is a good sign but you must
agree that until that happens the desktop application that run on a JVM
in a windows machine is faster then on a linux machine.

Finally i just wanted to make clear that these benchmarks are nothing
"official" nor it ever tried to be. I was benchmarking load speed and
memory consumption of an idle application, ignoring the fact that i've
made the processes error, and i think i can believe in those 2
benchmarks. Kaffe is still the most light JVM around Sun's JVM is of
course the fastest, the other JVM options are still, IMO, very good.