" Thread .join();" slow down windows system

Hi,
I'm writing a multi-thread app. My app threads are CPU-bound.
For simplicity I'm starting to develop the multi-thread using only 1 thread.
My app use "<Thread>.join();" calls for inter-thread sync.
And now ... surprise!
If I launch my app on a Athlon 3000XP+ (with linux FC6x64 with jvm 1.6.0-b15)
I obtain 54000 msec execution time.
If I launch it on a Athlon 3800x2 XP+ (with WInXP-SP2 with jvm 1.6.0_02) I
obtain 80000 msec execution time!!!
BUT, If I replace "t1.join()" with a:
while(t1.isAlive())
Thread.sleep(100);
the execution time drop down to 57000 msec (which is, in every case,
bigger than Athlon 3000 exec. time).
Seem that join() method calls subtract CPU to the CPU-intensive thread!
I have missed something?
TIA

Ah yeah. Okay. Sure.
Have you considered reading this? http://java.sun.com/docs/books/tutorial/essential/concurrency/index.html

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" Thread .join();" slow down windows system

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