There's at least one warning in OFED that Betsy mentioned today about
sched_setaffinity():
ch3_smp_progress.c:2427: warning: passing argument 3 of
'sched_setaffinity' from incompatible pointer type
Be advised that the prototypes for sched_setaffinity() and
sched_getaffinity() have changed multiple times over the life of the
2.4 and 2.6 kernel series. Even worse, the the signatures in glibc
have not always matched those in the kernel -- even in shipping Linux
distros.
The Open MPI project spun off a tiny library to solve exactly this
problem (because it really has nothing to do with MPI): the Portable
Linux Processor Affinity (PLPA) project. PLPA provides
plpa_sched_setaffinity() and plpa_sched_getaffinity() API calls with
constant signatures and will do the Right Thing regardless of what
version of glibc and/or kernel you have. PLPA is fully embeddable in
other software projects (e.g., we embed it in Open MPI; htop also
embeds it, IIRC). PLPA's license is BSD. See the project page here:
http://www.open-mpi.org/projects/plpa/
Ping me on the PLPA mailing list if you have any questions /
comments / suggestions / patches / etc. You have to be subscribed to
post, sorry.
Enjoy.
--
Jeff Squyres
Cisco Systems
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