Diff. between running java code in a single processor vs multiprocessor

Hi,
This is a general question and I tried to find answer for it, but couldn't find so came here as usual.
When designing a new Java project do we need to consider whether the application will be running in a single processor/multi processor. Does our design affect assigning thread to different processors? if so what the steps that we need to take, so that my application makes full use of multiprocessor. What is the difference in desinging application for single processor and multi processsor? Recently we had a problem in which our application makes use of only 2 processor out of 16 and I have no answer for it.
Thanks.

I have some good amount of experience working with
multi threaded java program and i know about the
overhead involved and overkill in multi threaded
programs.
let's assume that for the moment (many beliefs held about MT and MP computing are wrong, including possibly some or all of my own).
Will design vary depending whether we deploy it in a
multi-processor / singe processor CPU ?
If it was correctly implemented before, no.
But keep in mind that instead of receiving subsequent timslices threads can in an MP environment run truely in parallel.
If threads depend on the timing of other threads (ugly but we all know it happens) things can go wrong.
Of course as with all MT issues they tend to go wrong only after the product has passed all tests and has shipped to customers.
If it's the job of the operating system to assign
threads to different processor, then it doesn't
matter whether I design keeping in mind single
processor or multi processor CPU? OS willRead above. It SHOULD NOT matter, if your design is good.
intelligently give different threads to different
processor to make use of multiple processors right?Either the OS or the hardware. In an MP system there may well be dedicated hardware to do CPU allocation rather than it being handled by the operating system.

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