[Beowulf] help on island model

[purnima]

hi,
      I've to implement island model genetic algorithm using MPI. the problem is I've already implemented a parallel Genetic Algorithm using MPI where i divide population into subpopulations and distribute it 2 all the processors, and each processors performs sequential GA on its subpopulation after some iteration these processors migrates its best chromosome toe ach other and again proceed.
 
 My problem is that i dnt understand what exactly is island model? what island represents??  how shud i implement it.. 
 Plz reply soon..
 thanx
 
			
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