David E Hudak <dhu...@osc.edu> wrote on 06/24/2011 04:47:45 PM:
>
> [X10-users] Java native interface and runtime?
>
> Hi All,
>
> I have a colleague with a Java implementation of a genetic
> algorithm. He is interested in parallelizing the application for
> both multicore and multinode execution.
>
> In the initial implementation, there are a set of classes for
> specifying fitness functions, expressing genes and implementing gene
> manipulations. There is a top-level simulation object that run the
> various number of generations. My plan was to try using the java
> native interface to use the existing Java classes for organisms and
> fitness, and rewrite the top level simulation in X10.
>
> I have been evaluating X10 for purely numeric applications on our
> cluster (C++ back end, MPI runtime and mpiexec as a process
> launcher). I believe I read somewhere that the Java native
> interface requires the Java back end. In that case, I'd need to
> make sure we could run the sockets runtime and whatever process
> launcher we have for java (x10run?).
>
> Anyone have any advice?
>
Following up on what Igor said, I'd suggest going with your plan of writing
the top level simulation in X10, but instead of using JNI, try to use the
multi-place Java implementation of X10 and call the Java generic algorithm
from X10 compiled to Java.
We're kicking off an activity over the summer to make the X10/Java
interoperability even more user-friendly, so this could be an interesting
case study for us. Let us know if you run into problems.
We've also been making some nice improvements (post 2.2 release) in the
performance of the multi-JVM implementation of X10. So once your code is
working, if there are communication related performance problems, we could
also work with you to try it on the development branch we have going right
now to work on multi-JVM serialization performance.
--dave
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