Thank you for the clear explanation Dave.
By the way I found a small correction for the KMeans sample given in the
distribution. In KMeansDist.x10 inside samples the following code at line
106 should be followed by an 'at (d)' as I understood.
for (d in points_dist.places()) async {
Thank you,
Saliya
On Mon, Oct 29, 2012 at 10:03 AM, David P Grove <gro...@us.ibm.com> wrote:
> Saliya Ekanayake <esal...@gmail.com> wrote on 10/26/2012 02:14:34 AM:
>
> >
> > I would really appreciate if someone can point me to an explanation
> > of PlaceLocalHandle in X10 standard library.
> >
> > In particular what happens to a PlaceLocalHandle object during an
> > "at" place shift?
> >
>
> Hi,
>
> There is a header comment at the top of the file, but it is a bit terse.
>
> One way to think of a PlaceLocalHandle is that it is an opaque id that
> can be used to access an object in the local Place. Mentally think of
> there being a static field that contains a HashMap in each place and the
> PlaceLocalHandle is the key that is used to look up the value in the
> HashMap of the current Place.
>
> Across an "at", only the id (the PlaceLocalHandle) is serialized.
>
> There are some examples of using a PlaceLocalHandle in the KMeansDist
> sample program.
>
> Inside of the X10 standard library, we use PlaceLocalHandle to implement
> DistArray. (more complicated example, but "real" code that uses
> PlaceLocalHandle (and CustomSerialization) to build a
> communication-efficient distributed data structure).
>
> --dave
>
>
>
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--
Saliya Ekanayake
http://www.esaliya.blogspot.com
http://www.esaliya.wordpress.com
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