Charm++ parallel programming system

[Phil Miller <mille121 AT illinois.edu>]

In both AMPI and normal Charm++, I believe that CkMyPe() should give you a more sensible view of which real execution unit (processing element) the code is running on. I hesitate to say 'physical processor' because there may not be a direct correspondence between PE and processor for a variety of reasons.

Looking at PID definitely doesn't tell you physical processor, for a few reasons. First, Charm++ has an SMP mode that lets multiple PEs run in a single process, so that they can pass messages by pointer. Second, PID may be the same for processes on different nodes. If you want a distinct identifier for the process, you can call CkMyNode() (current Charm++ calls each OS process a 'node').

I hope this is useful. It would help if you describe the more detailed problem you're facing.

Phil

On Dec 19, 2014 5:54 AM, "Sabrina Bergoch" <sabrinabms AT gmail.com> wrote:

Hello,

 

In AMPI you can easily identify the virtual processor and physical processor, as shown below:

 

MPI_Comm_rank(MPI_COMM_WORLD, &myrank);

pid = getpid();

std::cout << "(2)Hello, World! from -  rank:"<< myrank <<"- pid:"<< pid<<endl;

 

How can I do something similar in charm++?

Regards,

Sabrina Sambatti

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