Hmm,
but now array initializations throw this exception too (see attached
program) :-/ One would expect them to do the initialization work at the
correct place, according to the distribution.
Ales
class AsyncArr2
{
val VECTLENGTH = 8;
val Reg:Region = 0..VECTLENGTH-1;
val Distr = dist.makeBlock(Reg);
public def run() : void
{
val a = Array.make[int](Distr);
}
public static def main(var args: Rail[String])
{
new AsyncArr2().run();
}
}
On Fri, Oct 10, 2008 at 5:21 PM, Ales Kozumplik <[EMAIL PROTECTED]>wrote:
> Hi Igor,
>
> thank you, this explains and solves the problem.
>
> Ales
>
>
> On Fri, Oct 10, 2008 at 3:46 PM, Igor Peshansky <[EMAIL PROTECTED]> wrote:
>
>> Hi, Ales,
>>
>> X10 does have the facility to check at run time whether the reference
>> is to a local object or to a "remote" object (the "remote" is in quotes
>> because on a shared memory implementation there isn't that much of a
>> difference). However, that facility is turned off by default. To turn
>> it on, run the program giving the -BAD_PLACE_RUNTIME_CHECK=true argument
>> to the "x10" script.
>> Igor
>>
>> "Ales Kozumplik" <[EMAIL PROTECTED]> wrote on 10/10/2008 09:08:14
>> AM:
>>
>> > Hi,
>> >
>> > I'm getting a bit confused here: I have declared an array distributed
>> across
>> > several places. When I make a function that reads and modifies every
>> element
>> > of this array, the program builds and runs without throwing an
>> exception.
>> >
>> > Isn't this contradicting e.g. paragraph 2.3 in the Report where it's
>> said
>> > that:
>> >
>> > """
>> > an activity may
>> synchronously
>> > access
>> > data items only in the current place (the place in which the activity is
>> > running).
>> > It may atomically update one or more data items, but only in the current
>> > place.
>> > To read a remote location, an activity must spawn another activity
>> > asynchronously
>> > (ยง14.2).
>> > """
>> > ?
>> >
>> > Or does this simply mean that spawning the activity and forcing futures
>> > happens 'behind the scenes' ? I'm attaching my program below, perhaps
>> I've
>> > misunderstood some of the concepts. I'm using X10 1.7.
>> >
>> > Thank you,
>> > Ales
>> >
>> > === ===
>> > class AsyncArr
>> > {
>> > val VECTLENGTH = 8;
>> > val Reg:Region = 0..VECTLENGTH-1;
>> > val Distr = dist.makeBlock(Reg);
>> >
>> > public def run() : void
>> > {
>> > System.out.println(Distr);
>> > val a = Array.make[int](Distr, (p(i) : Point) => i);
>> > for (var i:int = 0; i < VECTLENGTH; i++)
>> > {
>> > a(i) = a(i)*2;
>> > System.out.println(a(i));
>> > }
>> > }
>> >
>> > public static def main(var args: Rail[String])
>> > {
>> > new AsyncArr().run();
>> > }
>> > }
>> >
>> -------------------------------------------------------------------------
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>> --
>> 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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