Nope.  Though I would be pretty surprised to find that it made a  

_huge_ difference.



Some stuff to note.  Way back when we had ECJ more heavily  

multithreaded in certain locations.  And discovered that as a result  

it was *slower* than just running on a single CPU.  This is because  

the thread overhead is quite high if your threaded tasks are short in  

duration.



LoadElites is expensive: it's O(n^2) in the worst case.  So it's an  

obvious candidate for parallelization if possible.  And Java's thread   

overhead has reduced since the earlier days described before (but not  

as much as you'd think).  So go for it if you've got a strategy for  

doing so.  But (1) I think it may not be trivial to parallelize  

LoadElites and (2) compared to the evaluation phase -- which usually  

dominates stuff timewise -- ordinarily such a beast wouldn't be that  

costly.  So think carefully first about whether it'd really be worth  

it...



Sean



On Jan 22, 2010, at 7:25 AM, Adam Spalek wrote:



> All,

> I am running SPEA2 on several CPUs. The problem with the  

> SPEA2Breeder class

> is that all of the loadElites(...) loops run just on one CPU. Has  

> anybody

> already developed a support for multi-threads?

> Cheers