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# Open MPI extension: Affinity
## Copyrights
```
Copyright (c) 2010-2012 Cisco Systems, Inc. All rights reserved.
Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
```
## Authors
* Jeff Squyres, 19 April 2010, and 16 April 2012
* Terry Dontje, 18 November 2010
## Description
This extension provides a single new function, `OMPI_Affinity_str()`,
that takes a format value and then provides 3 prettyprint strings as
output:
* `fmt_type`: is an enum that tells `OMPI_Affinity_str()` whether to
use a resource description string or layout string format for
`ompi_bound` and `currently_bound` output strings.
* `ompi_bound`: describes what sockets/cores Open MPI bound this process
to (or indicates that Open MPI did not bind this process).
* `currently_bound`: describes what sockets/cores this process is
currently bound to (or indicates that it is unbound).
* `exists`: describes what processors are available in the current host.
See `OMPI_Affinity_str(3)` for more details.
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