On Wed, 2010-11-03 at 17:26 -0400, David P Grove wrote:
[ . . . ]
> We split Array into two classes: Array (an array that is local to a
> single place) and DistArray (an array that is potentially distributed
> across places).
Seems reasonable to me, since the two have different optimization
capabilities.
> The map methods on Array are fairly general.
>
> public def map[U](dst:Array[U](region),
> op:(T)=>U):Array[U](region){self==dst}
> public def map[S,U](dst:Array[S](region), src:Array[U](region),
> op:(T,U)=>S):Array[S](region)
>
> They require the Arrays to be defined over the same region, but are
> otherwise fairly general.
I may have missed it but I think that map only allows for transform
Array[T] to Array[T] it doesn't allow for Array[T] to Array[U]?
> Unfortunately, the map function on DistArray didn't get updated to be
> less restrictive in terms of the types involved. It still requires a
> (T)=>T operation, not a (T)=>S. I don't think there is any good
> reason for this, just that we were focusing on getting the Array API
> to be "right" with the intention of then updating DistArray all at
> once to match the improvements in the Array API and didn't do those
> updates in time for 2.1.0.
>
> Sorry about that, we'll get the APIs of DistArray and Array in sync
> for 2.1.1. You could probably do it with some minimal pain by either
> modifying DistArray directly to fix its map method, or by making a
> DistArray[Array[T]] and DistArray[Array[S]] and then writing an ateach
> that uses the Array map function in each place on the elements of the
> DistArray[Array]'s at that place. Not a pretty thing, but could be
> enough to get you unblocked.
In the end I went for a "just make an array using construction in
parallel" rather than "set up an array and then create a new one by
parallel map".
I thought ateach was being deprecated?
--
Russel.
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