Kshitij Mehta <kvm1...@gmail.com> wrote on 11/10/2009 02:53:48 PM:
> Hello
> I am running an x10 program (v 1.7) using the java backend on an 8
> core machine. I have set my NUMBER_OF_LOCAL_PLACES option to 8. Is
> there a way I can verify that 'ateach' runs its code block on separate
> cores? On similar lines, if I run my program on separate nodes of a
> cluster, can I verify that the ateach block is indeed being run on
> separate nodes ?
>
> Something like:
> ateach {
> Console.OUT.println("I am place: " + here.id + " on node: " +
node_id);
> }
Hi, Kshitij,
The answer to your first question is "no" - there is no way to find
out which processor a particular activity is running on (unless you
use some native functionality). We used to have some processor
binding support for Java on AIX, but I don't think we ever added it
for other systems.
As for the second question, if you use an external launcher, e.g.,
mpirun, with an appropriate hostfile, you can be assured that each
process (corresponding to a place) is spawned on a different node.
But again, you have no way (within the language) to verify that a
particular process is running on some node. You could probably
use a native method that calls "hostname", though.
Igor
--
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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