[X10-issues] [jira] Commented: (XTENLANG-1753) Array.copyTo, copyFrom broken on Blue Gene

[David G. (JIRA) <ji...@co...>]

    [ http://jira.codehaus.org/browse/XTENLANG-1753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=233141#action_233141 ] 

David Grove commented on XTENLANG-1753:
---------------------------------------

The API for copyTo/copyFrom may be a little odd.

copyTo/copyFrom are asynchronous.  So in your code example there is no reason to expect that the copyFrom (or copyTo) has completed before the println is executed.

I believe this should work:
{code}
val a = new Array[Int](0..1, ((i):Point) => (i+1));
val b = at (here.next()) {new Array[Int](0..1)};
finish a.copyTo(b);
at (b) {
    for (p in b) {
        Console.OUT.println(b(p));
    }
}
{code}

So you need to say:


> Array.copyTo, copyFrom broken on Blue Gene
> ------------------------------------------
>
>                 Key: XTENLANG-1753
>                 URL: http://jira.codehaus.org/browse/XTENLANG-1753
>             Project: X10
>          Issue Type: Bug
>          Components: X10RT/PGAS
>    Affects Versions: X10 SVN HEAD
>         Environment: Blue Gene
>            Reporter: Josh Milthorpe
>            Assignee: David Grove
>         Attachments: TestArrayCopyFrom.x10, TestArrayCopyTo.x10, TestArrayCopyTo.x10
>
>
> {{Array.copyTo}} works on Linux, but doesn't appear to work on Blue Gene.
> The following code runs correctly on Linux places using {{-x10rt mpi}} and {{-x10rt pgas_sockets}}, but fails on Blue Gene using {{-x10rt pgas_bgp}}.
> {code}
> val a = new Array[Int](0..1, ((i):Point) => (i+1));
> val b = at (here.next()) {new Array[Int](0..1)};
> a.copyTo(b);
> at (b) {
>     for (p in b) {
>         Console.OUT.println(b(p));
>     }
> }
> {code}
> On Blue Gene, the printed result is "0","0" instead of the expected "1","2".
> The same problem appears to affect {{Array.copyFrom}} (no test case attached).

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