> The answer to your first question is "no" - there is no way to find
> out which processor a particular activity is running on
> 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.
In case of a shared memory machine (single node) can I be sure that
each place is mapped to a different core? Its ok if I cannot verify
that through the language.
On Nov 10, 2009, at 2:36 PM, Igor Peshansky wrote:
> 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/)
>
Kshitij Mehta
Graduate Student
Parallel Software Technologies Lab
Dept. of Computer Science
University of Houston
USA
www.cs.uh.edu/~kmehta
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