Suggestions on how to get good timing on OSX?

[Mark Roos]

I have been working on execution time for my Smalltalk implementation and
am having trouble getting repeatable times.  I am using a script from a 
new
launch of java with all apps turned off.  I run the target code 10 times 
to let
Hotspot do its thing.  What I see are times of great performance and times 

that are 30% slower after they stabilize.  Since I am trying fine grained 
changes
in method lookups etc it makes it difficult to determine if what I try 
helps or hurts.

Any suggestions on how to do a better job?  I am using a core 2 duo with 
snow leopard.

thanks
mark

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