Hello again,
What version of the compiler are you working with?
What options are you compiling with and running with?
Olivier
"Rausch, Dominic" <dominic.rau...@student.kit.edu> wrote on 05/04/2012
03:58:35 PM:
> From: "Rausch, Dominic" <dominic.rau...@student.kit.edu>
> To: Mailing list for users of the X10 programming language <x10-
> us...@lists.sourceforge.net>,
> Date: 05/04/2012 04:01 PM
> Subject: Re: [X10-users] Clock bug?
>
> Hi,
>
> I'm a student working with Andreas.
> This isn't only a problem of buffered output as you supposed. The
> output of the following code is mixed up the same way as the prior
> one. Indeed, it seems a "a little less" mixed up, but is still not
> working as expected.
>
> public class Clockbug {
>
> public static def main(args: Array[String]) {
>
> val runs : Int = 10;
>
> val output : ArrayList[String] = new ArrayList[String]();
> val outputRef = GlobalRef[ArrayList[String]](output);
>
> clocked finish {
> for (place in Place.places()) at (place) {
> clocked async {
> for (var i : Int = 0; i < runs; i++) {
> val message1 = "Phase A at place " + here.id
> + " in run:" + i;
> at(outputRef) {
> atomic { outputRef().add(message1); }
> }
> Clock.advanceAll();
>
> val message2 = "Phase B at place " + here.id
> + " in run:" + i;
> at(outputRef) {
> atomic { outputRef().add(message2); }
> }
> Clock.advanceAll();
> }
> }}}
> for(s in output) {
> Console.OUT.println(s);
> }
> }
> }
>
> This code produces output such as:
>
> Phase B at place 2 in run:8
> Phase A at place 3 in run:8
> Phase B at place 0 in run:8
> Phase A at place 1 in run:8
> Phase A at place 2 in run:9
> Phase B at place 3 in run:8
> Phase A at place 0 in run:9
> Phase B at place 1 in run:8
> Phase B at place 2 in run:9
> Phase A at place 3 in run:9
> Phase B at place 0 in run:9
> Phase A at place 1 in run:9
> Phase B at place 3 in run:9
> Phase B at place 1 in run:9
>
> As you can see, the runs are still mixed up, let alone the phases.
> It seems to get worse with every iterations of the loop. It would be
> great if you could help.
>
> Dominic
>
> ________________________________________
> Von: Olivier Tardieu [tard...@us.ibm.com]
> Gesendet: Freitag, 4. Mai 2012 21:02
> An: Mailing list for users of the X10 programming language
> Betreff: Re: [X10-users] Clock bug?
>
> Hi,
>
> I think you are expecting outputs from distinct places to show in order.
> There is no such guarantee.
>
> You code guarantees that Console.OUT.println(...) in phase A at
> place 1 will happen before Console.OUT.printn(...) in phase B at place 0.
> But the messages may appear on the console in a different order (as
> they take time to travel across places).
>
> Olivier
>
> [cid:1__=0abbf367dff501ab8f9e8a93df...@us.ibm.com]Andreas Zwinkau
> ---05/04/2012 03:07:54 AM--------BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
>
> From: Andreas Zwinkau <zwin...@kit.edu>
> To: x10-users@lists.sourceforge.net,
> Date: 05/04/2012 03:07 AM
> Subject: [X10-users] Clock bug?
>
> ________________________________
>
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> The following program is not synchronized as I expect it to be:
>
> public class Clockbug {
> public static def main(args: Array[String]) {
> val runs = 7;
> clocked finish {
> for (place in Place.places()) at (place) {
> clocked async {
> for (var i : Int = 0; i < runs; i++) {
> atomic Console.OUT.println("Run "+i+" phase A at place " +
> here.id);
> Clock.advanceAll();
> atomic Console.OUT.println("Run "+i+" phase B at place " +
> here.id);
> Clock.advanceAll();
> }}}}}}
>
> For each iteration i, the "phase A" output should appear before the
> "phase B" output. However, I also observe output like this:
>
> $ X10_NPLACES=4 ./a.out
> Run 0 phase A at place 2
> Run 0 phase A at place 0
> Run 0 phase A at place 1
> Run 0 phase A at place 3
> Run 0 phase B at place 0
> Run 0 phase B at place 2
> Run 0 phase B at place 1
> Run 1 phase A at place 2
> Run 0 phase B at place 3
> Run 1 phase A at place 0
> Run 1 phase A at place 1
> Run 1 phase A at place 3
> Run 1 phase B at place 2
> Run 1 phase B at place 0
> Run 1 phase B at place 1
> Run 1 phase B at place 3
>
> Apparently, the iterations get mixed up. Is that a bug in Clock?
>
> - --
> Andreas Zwinkau
>
> Karlsruhe Institute of Technology (KIT)
> Institut für Programmstrukturen und Datenorganisation (IPD)
> Lehrstuhl Prof. Snelting
> Adenauerring 20a
> 76131 Karlsruhe
>
> Phone: +49 721 608 48351
> Fax: +49 721 608 48457
> Email: zwin...@kit.edu
> Web: http://pp.info.uni-karlsruhe.de/person.php?id=107
>
> KIT – University of the State of Baden-Wuerttemberg and
> National Research Center of the Helmholtz Association
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>
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