Hi Ye,
the syntax for Region and Point has changed since that example was
posted (I think it was in X10 2.1).
Points are now 'exploded' (separated into their component indices) using
square brackets, as follows:
for ([i,j] in (da|here)) {
Also, a Region can now be constructed simply as a product of integer
ranges, for example:
val r = 1..1000 * 1..1000;
The X10 Global Matrix Library implements many linear algebra operations
(including matrix-vector multiply) over a variety of matrix formats. It
may contain code examples that will be useful to you.
http://x10-lang.org/documentation/code-examples/global-matrix-library.html
Cheers,
Josh
On 20/04/12 09:01, Fan, Ye wrote:
Hi,
I'm new to X10 and currently coding with X10DT 2.2.2. Trying to
implement some simple numerical analysis algorithm, which involves
matrix vector multiplication. I've done it in the "concurrent" way
(spawn thread using async) and the performance is not very good. Now I
would like to try the "distributed" approach. However, I don't know
how to create and traverse a 2-d DistArray.
I actually found the following code snippet in the mailing list
regarding to "performance issue with matrix vector multiply program",
which is exactly what I need.
......
val r = [1..1000,1..1000] as Region;
val d = Dist.makeBlock(r);
val da = DistArray.make[float](d);
val start = System.nanoTime();
var tmp:float = 0;
for ((i,j) in (da|here)) {
tmp += da(i,j);
}
......
However, when I did it in the same way, my Eclipse refused to take
"for ((i,j) in (da|here))". Any idea where the problem is?
Thanks
Ye
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