Dear Muthu,
you may also use openmpi_ext package available at octave-forge in folder extra:
http://octave.svn.sourceforge.net/viewvc/octave/trunk/octave-forge/extra/openmpi_ext/
Hope this might give further material and other ideas to your research project.
Bests
Riccardo
--- Lun 8/2/10, Muthiah Annamalai <[email protected]> ha scritto:
Da: Muthiah Annamalai <[email protected]>
Oggetto: [OctDev] GA toolbox : scripts to use data parallelism by multicore
fitness evaluation
A: [email protected]
Data: Lunedì 8 febbraio 2010, 02:51
Hello Luca Favatella, and friends,
Octave can be used in ways Matlab cannot be,
for example
in problems which have data-parallelism ( same problem solved
for different initial conditions/ data ) Octave gives a large speedup
factors.
A master Octave can spawn several Octave processess whose parameters
are written in a disk and then wait for all of them to end, and pickup
the resulting data
from known saved files. So this would easily allow throwing
multicore resources at a problem which allows data parallelism, which otherwise
would run as just a single Octave serial process.
In a GA toolbox we evaluate same function/program for different
data and this can make use of the data parallelism.
Under the assumptions of having a Fitness functions (f(x)) to be
specified as a string, and
[ncores] has to be the number of cores to be used in the GA fitness evaluation,
specified as an attribute to GA problem structure, we can do this by creating
replacing __ga_scores__.m
script with the following pair of scripts,
__ga_multicore_scores__.m
__ga_multicore_helper__.m
You can test these scripts by, running test_multicore.m .
(please see attachments. )
We need fitness functions as a string, since child processess donot share
memory with the parent/master process.
Ofcourse the benefit of a multicore fitness function evaluator doesnt
show up until
out f(x) is very time-consuming. This is a neat problem with explicit
parallelism.
I would like to help integrate these scripts with the current design
of the GA toolbox
by adding the attributes to the GA.m, so I am stopping from directly
editing the rest
of the toolbox.
Best,
-Muthu
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