Java does not exploit / make the most from my CPU... HELP

I am working with big matrices in an information retrieval platform wrote in java.
The main operation I do in this platform is compute the SINGULAR VALUE DECOMPOSITION of big matrices. This operation is slow, because SVD has an high computational cost.
Since I need to do SVD lots of times, I want java do it as fast as it can.
I have an Athlon X2 6000+, with 3gb ram, and, during SVD computation I can see (from task manager) that the process javaw only uses 50% of my cpu.
I want it to take 100% so it can compute SVD faster.
Is there a way to let java do this ?
I am already using this JVM options (on windows xp 32bit and eclipse):
-Xms512m -Xmx1600m -XX:+AggressiveOpts
I hope someone can help me.

But you probably perform 1000+ decompositions. So you call the package methods from (at least) two different threads.
That way the package itself doesn't need to support multithreading.
One SVD shouldn't take that long anyway, (how big are your matrices?) so creating threads would be a bad idea for the method itself anyway.
Try to spot unrelated series of computations and make a thread out of those, maybe have a look at thread pools.
Since I don't know what you're trying to achieve I can't say more about how you could make your app multithreaded.

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