Hi there,
the output looks fine. You should have 100x "test,Place(0)" and 100x
"test,Place(1)". I am getting these messages in mixed order, when
compiling with native X10 (x10c++):
[...]
test,Place(0)
test,Place(0)
test,Place(0)
test,Place(0)
test,Place(0)
test,Place(0)
test,Place(0)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(1)
test,Place(0)
test,Place(1)
test,Place(1)
test,Place(1)
[...]
When compiling with managed X10 (x10c), i get the same results as you do
(first the Place(0)'s, then the Place(1)'s). So it seems to be only a
matter of output-ordering.
Also, you will not get any speedup by using multiple places in this
special scenario since println(...) is the performance-bottleneck.
I have modified you program a little bit, so you can measure a speedup:
public class Hello {
public static def main(args:Rail[String]) {
val iter:Long = Long.parse(args(0));
val hello = new Hello();
val start:Long = System.currentTimeMillis();
val each = iter/Place.MAX_PLACES;
finish {
for (var i:Long = 0; i < Place.MAX_PLACES; ++i) {
at (Place(i)) async { hello.test(each); }
}
}
val stop:Long = System.currentTimeMillis();
Console.OUT.println( here + ": time consumed = "
+ (stop - start) + " ms.");
}
private def test(val iter:Long) {
for(var i:Long=0;i<iter;i++) {
//Console.OUT.println("test,"+here);
}
}
}
Output with managed X10:
One place:
$ x10 Hello 10000000000
Place(0): time consumed = 6605 ms.
Two places:
$ x10 Hello 10000000000
Place(0): time consumed = 3538 ms.
Output with native X10:
One place:
$ ./Hello 10000000000
Place(0): time consumed = 25218 ms.
Two places:
./Hello 10000000000
Place(0): time consumed = 13012 ms.
(I used Java 1.7.0_60, gcc 4.8.3 and x10 2.4.3)
I hope i was able help. =)
Cheers,
Marco
Am 22.08.2014 um 08:54 schrieb 王辰:
> Hello everyone, i'm new to x10.
> I have a little problem about parallelization, here's my code:
>
> public class Hello {
>
> public static def main(args:Rail[String]) {
>
> val hello = new Hello();
>
> at (Place(1)) async hello.test();
>
> at (Place(0)) async hello.test();
>
> }
>
> private def test() {
>
> for(var i:Int=0n;i<100n;i++) {
>
> Console.OUT.println("test,"+here);
>
> }
>
> }
>
>
> I thought the output should not be the same if i run it several time.
> But it was always the same:
>
> Place(0)
> Place(0)
> ...
> Place(0)
> Place(0)
> Place(1)
> Place(1)
> ...
> Place(1)
> Place(1)
>
> Can anyone tell me is it so and what should i do to implement real
> parallelization?
>
> Thanks.
>
>
>
>
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