[Beowulf] help on island model
kyron at neuralbs.com
Thu Mar 9 11:20:56 EST 2006
I happen to be working on just this subject ;)
Island model can be more than one thing, it depends on your implementation.
>From your description, you seem to be implementing a "multiple-deem" approach
while retaining the same GA parameters across these islands. David A. Van
Veldhuizen addresses the parallelisation issues in his document entitled
"Considerations in Engineering Parallel Multiobjective Evolutionary
Even though his article is oriented towards MOGAs, most if not all issues
brought up in his article also apply to GAs. To give you an idea, here are
four points brought up in his article specifically about island model:
Four basic island pMOEA variants are seen to exist, each with
appropriate migration operators.
1) All islands execute identical MOEAs/parameters (homo-
2) All islands execute different MOEAs/parameters (hetero-
3) Each island evaluates different objective function subsets.
4) Each island represents a different region of the genotype
or phenotype domains.
My masters is actually geared at trying to "answer" or "reply" to some of the
unanswered questions brought up in this same article (providing quantitative
results with a clearly defined/detailed environment specification as well as
some sort of recipe for parallelising a specifically given MOGA).
I hope this reference helps!
Le Dimanche 5 Mars 2006 03:30, purnima a écrit :
> 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..
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