Nth core, so it fell over to try to find the Nth PU.
-----
hwloc isn't able to find cores on all platforms. Example: PPC64
running RHEL 5.4 (linux kernel 2.6.18) only reports NUMA nodes and
PU's. Fine.
However, note that hwloc_get_obj_by_type() will return NULL in 2
(effectively) different cases:
- no objects of the requested type were found
- the Nth object of the requested type was not found
So first we have to see if we can find *any* cores by looking for the
0th core. If we find it, then try to find the Nth core. Otherwise,
try to find the Nth PU.
This commit was SVN r24632.
the module to use the new hwloc bitmap API (the cpuset API is both
klunkier and deprecated), which simplified a few things.
This commit was SVN r24217.
platforms (e.g., PPC64 running RHEL 5.4) -- sometimes it only finds
PUs. So in that case, just run the same calculation, but with PUs
instead of cores.
This commit was SVN r23305.
* If < 0, it's an OPAL_ERR_* value
* If >= 0, it's the actual output value of the function
This is problematic for the OPAL_SOS stuff. This commit changes those
functions to always return OPAL_* statuses and send the output value
back through output parameters (like 95% of the rest of the code
base). This avoids the confusion with OPAL_SOS stuff and makes
paffinity work again (e.g., mpirun --bind-to-core ...).
I updated all paffinitiy modules for the new function signatures, and
bumped the paffinity API version up to 2.0.1. I don't think the
version change will matter, though, because we'll be introducing
support for hardware threads soon, which will either bump the
paffinity version again or we'll replace paffinity with
a new framework.
This commit was SVN r23197.
* Fix disabling hwloc build (i.e., put the AM_CONDITIONALs where they
belong in the configure.m4 file)
* Update some svn:ignores
* r23142 removed some extraneous code, but forgot to remove the
variables used only by that code
This commit was SVN r23152.
The following SVN revision numbers were found above:
r23142 --> open-mpi/ompi@610fc67d12
supports a wide variety of operating systems and platforms; see the
opal/mca/paffinity/hwloc/hwloc/README file for details.
This component includes an embedded copy of hwloc, currently based on
hwloc-1.0rc6. But note that hwloc is properly SVN imported into the
/vendor branch, so it will be easy to update when 1.0 GA is released.
Note that the hwloc tree embedded in opal/mca/paffinity/hwloc/hwloc is
identical to a hwloc distribution tarball, except that much of the
documentation was rm -rf'ed (because we don't need it for the embedded
case).
Since the paffinity framework currently does not understand hardware
threads, the hwloc component compensates for this by identifying cores
by the "first" hardware thread on that core. Hopefully we'll update
paffinity someday to understand hardware threads. :-)
configure grew a --with-hwloc option, analogous to what we do for many
other external libraries that OMPI supports. However, there's a new
feature: due to the request of several distros, OMPI can be configured
to build with its internal copy of hwloc or with an external copy of
hwloc (e.g., a system-installed hwloc).
1. If --with-hwloc is not specified, Open MPI will try to use its
internal copy (but silently fail/ignore hwloc if that fails).
1. If --with-hwloc=<dir> is supplied, Open MPI looks for hwloc
support in <dir> (and --with-hwloc-libdir=<dir>, if specified).
1. If --with-hwloc=external is supplied, Open MPI will look for hwloc
in a compiler/linker default external location.
1. If --with-hwloc=internal is supplied, Open MPI will use its
internal copy of hwloc.
Some of OMPI's main configury had to be slightly re-arranged in the
bootstrapping phase to accomodate hwloc's configry needs.
This commit was SVN r23125.
