On Sunday 07 February 2010 10:12:42 pm Cunningham, David wrote:
> That looks like a bug I fixed in the last few months but I can't remember
> whether I fixed it before or after the last release. You might try doing
> an SVN build of X10 or using the PGAS binaries for the svn release with
> your version of X10. The error comes from our transport layer which was
> originally used just for UPC, and the error messages have not been changed
> to reflect its more general use these days. If you are using the MPI
> backend then this should never have occured but I expect you are using
> mpirun as a launcher to launch the PGAS backend which is not what we mean
> by the MPI backend. The MPI backend is a completely different codebase
> and therefore has a different set of bugs :)
> ________________________________________
> From: Christoph Pospiech [christoph.pospi...@de.ibm.com]
> Sent: 07 February 2010 06:25
> To: Cunningham, David
> Cc: x10-users@lists.sourceforge.net
> Subject: Re: [X10-users] DistributedRail
>
>
> David,
>
> thanks for your hint to use clocks. Apparently, I am still using the
> DistributedRail class the wrong way. Following your hint to use the
> collective operation like a "next" statement, I was calling it
> "collectively" from every place. But this gives me an error message as
> printed below. Could you please have a look ?
>
David,
I just got a new X10DT (version 2.0.2) and picked up the trail again. It now
compiles and runs to completion, but the result is unexpected. I was under the
impression that "v_tmp.collectiveReduce(Int.+);" would add the values of v_tmp
across the MPI tasks. The expected value is 0+1+2+3 = 6. The actual value is
0.
So, apparently, something went wrong. Do you have an explanation ?
<map>
<host name="sirius" slots="1" max_slots="0">
<process rank="0"/>
<process rank="1"/>
<process rank="2"/>
<process rank="3"/>
</host>
</map>
<stdout rank="0">main: before ClockTest</stdout>
<stdout rank="2">Before next</stdout>
<stdout rank="3">Before next</stdout>
<stdout rank="0">Before next</stdout>
<stdout rank="1">Before next</stdout>
<stdout rank="1">After next</stdout>
<stdout rank="1">v_tmp(0)=1</stdout>
<stdout rank="3">After next</stdout>
<stdout rank="3">v_tmp(0)=3</stdout>
<stdout rank="2">After next</stdout>
<stdout rank="2">v_tmp(0)=2</stdout>
<stdout rank="0">After next</stdout>
<stdout rank="0">v_tmp(0)=0</stdout>
<stdout rank="0">After finish</stdout>
<stdout rank="0">v_tmp(0)=0</stdout>
<stdout rank="0">main: after ClockTest</stdout>
--
Mit freundlichen Grüßen / Kind regards
Dr. Christoph Pospiech
High Performance & Parallel Computing
Phone: +49-351 86269826
Mobile: +49-171-765 5871
E-Mail: christoph.pospi...@de.ibm.com
-------------------------------------
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import x10.util.DistributedRail;
public class Hello {
def ClockTest() {
val c = Clock.make();
val v_tmp:DistributedRail[Int]
= new DistributedRail[Int](4,
(i:Int) => {(0) as Int});
finish {
for (p in Place.places ) {
async (p) clocked (c) {
for (var k:Int=0; k<4; k++) {
v_tmp(k) = p.id();
}
Console.OUT.println("Before next");
next;
Console.OUT.println("After next");
Console.OUT.println("v_tmp(0)="+v_tmp(0));
next;
v_tmp.collectiveReduce(Int.+);
}
}
c.drop();
}
Console.OUT.println("After finish");
Console.OUT.println("v_tmp(0)="+v_tmp(0));
}
public static def main(var args: Rail[String]!) {
Console.OUT.println("main: before ClockTest");
var h:Hello! = new Hello();
h.ClockTest();
Console.OUT.println("main: after ClockTest");
}
}------------------------------------------------------------------------------
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