Sun Java 6 u23 64bit quick benchmark

I’ve done a quick SciMark 2.0 run on my workstation to check how does 64bit jvm compare to 32bit now.
After doing some googling you’ll find that 64bit should be slightly slower then 32bit one, but now it looks like
64bit get’s slightly better score. Just check results:

64bit
Composite Score: 1099.0115099348393
FFT (1024): 665.4866866571888
SOR (100×100): 1199.473994733188
Monte Carlo : 576.0417625670027
Sparse matmult (N=1000, nz=5000): 1006.3109331309566
LU (100×100): 2047.7441725858605

java.vendor: Sun Microsystems Inc.
java.version: 1.6.0_23
os.arch: amd64
os.name: Windows Vista
os.version: 6.0

32bit
Composite Score: 1021.1277346401823
FFT (1024): 617.6489777055452
SOR (100×100): 1199.4740837393817
Monte Carlo : 557.3536697273923
Sparse matmult (N=1000, nz=5000): 763.8228612272541
LU (100×100): 1967.339080801338

java.vendor: Sun Microsystems Inc.
java.version: 1.6.0_23
os.arch: x86
os.name: Windows Vista
os.version: 6.0

And to get some overview about what’s the general direction:
32bit Java 5
Composite Score: 858.5798683916573
FFT (1024): 553.5514526595406
SOR (100×100): 1199.1008189202623
Monte Carlo : 90.07901150398631
Sparse matmult (N=1000, nz=5000): 587.5033130006082
LU (100×100): 1862.6647458738896

java.vendor: Sun Microsystems Inc.
java.version: 1.5.0_22
os.arch: x86
os.name: Windows Vista
os.version: 6.0

It looks like 64bit performance loss is finally over.

All tests were run on server VM and launched only once so it’s not very representative.
You can run it yourself. Just get SciMark from: http://math.nist.gov/scimark2/
Please share your results if you do some more benchmarking.
I wonder what would be a difference between Java 6_u22 and 6_u23 when HotSpot 19 was introduced?

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