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
From: Andreas Zwinkau <zwin...@kit.edu>
To: x10-users@lists.sourceforge.net,
Date: 05/04/2012 03:07 AM
Subject: [X10-users] Clock bug?
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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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