On the OMPI SVN trunk, we have an "Open MPI extension" call named
OMPI_Affinity_str(). Below is an excerpt from the man page. If this is
desirable, we can probably get it into 1.5.1.
-----
NAME
OMPI_Affinity_str - Obtain prettyprint strings of processor affinity
information for this process
SYNTAX
C Syntax
#include <mpi.h>
#include <mpi-ext.h>
int OMPI_Affinity_str(char ompi_bound[OMPI_AFFINITY_STRING_MAX],
char current_binding[OMPI_AFFINITY_STRING_MAX],
char exists[OMPI_AFFINITY_STRING_MAX])
[snip]
OUTPUT PARAMETERS
ompi_bound
A prettyprint string describing what processor(s) Open MPI
bound this process to, or a string indicating that Open MPI
did not bind this process.
current_binding
A prettyprint string describing what processor(s) this
process is currently bound to, or a string indicating that
the process is bound to all available processors (and is
therefore considered "unbound").
exists A prettyprint string describing the available sockets and
cores on this host.
On Sep 23, 2010, at 11:10 PM, Ralph Castain wrote:
> You mean via an API of some kind? Not through an MPI call, but you can do it
> (though your code will wind up OMPI-specific). Look at the OMPI source code
> in opal/mca/paffinity/paffinity.h and you'll see the necessary calls as well
> as some macros to help parse the results.
>
> Depending upon what version you are using, there may also be a function in
> opal/mca/paffinity/base/base.h to pretty-print that info for you. I believe
> it may only be in the developer's trunk right now, or it may have made it
> into the 1.5.0 release candidate....
>
>
> On Thu, Sep 23, 2010 at 11:24 AM, Fernando Saez <saezferna...@gmail.com>
> wrote:
> Hi all, I'm new in the list. I don't know if this post has been treated
> before.
>
> My question is:
>
> Is there a way in the OMPI library to report which process is running
> on which core in a SMP system? I need to know processor affinity for
> optimizations issues.
>
> Regards
>
> Fernando Saez
>
>
>
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--
Jeff Squyres
jsquy...@cisco.com
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