"TAJCHMAN Marc" <marc.tajch...@cea.fr> wrote on 09/20/2009 06:30:15 AM:
> Hi everyone,
>
> Thanks for helping me on previous messages (especially Igor).
>
> Below are 2 versions of a test (defining and accessing a distributed
> array on several places).
> This is a variation of an example code from X10 distribution
> (EncapsulatedArray2D).
>
> The first version is (apparently) working well but the second one
> launches several x10.lang.BadPlaceException.
>
> The differences are :
>
> - first version : the distributed array is created and accessed only
> from the static main function
> - second version : the array is now a member of the class containing
> the main function. It's created inside the class constructor and
> accessed from other class method.
>
> Thanks a lot for any suggestion.
>
> Marc
Hi, Marc,
Don't forget that in version 2, t is of a class type, and
thus lives in a particular place (where it was created,
in this case place 0). When you access "A" in the input()
and output() methods, it's really a shorthand for "this.A",
so you are reading a field of an object. Attempting to do
this in any place other than where the object lives will
give you a BPE -- that's expected behavior.
There are a couple of possible solutions. One is to
capture the field value separately from the object, namely:
def init() {
val A = this.A;
finish ateach (val (i): Point in A.dist)
A([i]).init(i);
}
def output() {
val A = this.A;
for (val p in A.dist.places())
at(p) {
val r : Region = A.dist.get(here);
for ((i): Point in r) {
println("subdomain "+i+" place = "+ here);
A([i]).output();
println("");
}
}
}
Another is to make test8 a value class, which would
enable replication of the object across places.
Hope this helps,
Igor
> // =====================================================
> // working code
> public class test8 {
>
> static def println(s:String) = Console.OUT.println(s);
> static def print(s:String) = Console.OUT.print(s);
>
> static value bloc{
> val m_array: Array[double];
> def this(val a_array: Array[double]): bloc = {
> m_array=a_array;
> }
> def init(val i:int) : Void = {
> for (val (j): Point(1) in m_array)
> m_array([j])= 10*j + i;
> }
> def output() : Void = {
> for (val (j): Point(1) in m_array) {
> println(" "+j+" : " + m_array([j]));
> }
> }
> }
>
>
> public static def main(a: Rail[String]) : void {
>
> val R : Region = [1..5];
> val r : Region = [1..3];
>
> val D = Dist.makeCyclic(R, 0);
> val A = Array.make[bloc]
> (D, (p:Point) =>
> new bloc(Array.make[double](r->here,(Point)=>0.0D)));
>
> finish ateach (val (i): Point in D)
> A([i]).init(i);
>
> for (val p in A.dist.places())
> at(p) {
> val r : Region = A.dist.get(here);
> for ((i): Point in r) {
> println("subdomain "+i+" place = "+ here);
> A([i]).output();
> println("");
> }
> }
> }
> }
>
> // ========================================================
> // non working version
>
> public class test8c {
>
> val A : Array[bloc];
>
> static def println(s:String) = Console.OUT.println(s);
> static def print(s:String) = Console.OUT.print(s);
>
> static value bloc{
> val m_array: Array[double];
> def this(val a_array: Array[double]): bloc = {
> m_array=a_array;
> }
> def init(val i:int) : Void = {
> for (val (j): Point(1) in m_array)
> m_array([j])= 10*j + i;
> }
> def output() : Void = {
> for (val (j): Point(1) in m_array) {
> println(" "+j+" : " + m_array([j]));
> }
> }
> }
>
> def init() {
> finish ateach (val (i): Point in A.dist)
> A([i]).init(i);
> }
>
> def output() {
> for (val p in A.dist.places())
> at(p) {
> val r : Region = A.dist.get(here);
> for ((i): Point in r) {
> println("subdomain "+i+" place = "+ here);
> A([i]).output();
> println("");
> }
> }
> }
>
> def this() {
>
> val R : Region = [1..5];
> val r : Region = [1..3];
>
> val D = Dist.makeCyclic(R, 0);
> A = Array.make[bloc]
> (D, (p:Point) =>
> new bloc(Array.make[double](r->here,(Point)=>0.0D)));
> }
>
> public static def main(a: Rail[String]) : void {
> val t : test8c = new test8c();
> t.init();
> t.output();
> }
> }
--
Igor Peshansky (note the spelling change!)
IBM T.J. Watson Research Center
XJ: No More Pain for XML's Gain (http://www.research.ibm.com/xj/)
X10: Parallel Productivity and Performance (http://x10.sf.net/)
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