The Hardware Locality (hwloc) team is pleased to announce the first
release candidate for v1.6:

v1.6rc1 is the first milestone of a major feature release. It brings
a significant rework of the core which eases the combining of multiple
topology discovery sources, and future additions of new sources.
Some components may also now be built and loaded as separate plugins,
which should make distribution packagers' life easier.

Aside of this core rework, we have the usual set of small API additions
(one may now export/import its own custom private data to XML), new
command-line tools (hwloc-annotate), new command-line options, some
small discovery improvements.

They are also a couple bug fixes that were waiting for a v1.5.2 release,
that may or may not ever exist.

Please test it, and feel free to pass by the Inria booth at SC12
(#1209) to discuss all this and/or report problems.


Version 1.6.0
* Major changes
  + Reorganize the backend infrastructure to support dynamic selection
    of components and dynamic loading of plugins. For details, see the
    new documentation section Components and plugins.
    - The HWLOC_COMPONENTS variable lets one replace the default discovery
    - Dynamic loading of plugins may be enabled with --enable-plugins
      (except on AIX and Windows). It will build libxml2 and libpci
      support as separated modules. This helps reducing the dependencies
      of the core hwloc library when distributed as a binary package.
* Backends
  + Add CPUModel detection on Darwin and x86/FreeBSD.
    Thanks to Robin Scher for providing ways to implement this.
  + The x86 backend now adds CPUModel info attributes to socket objects
    created by other backends that do not natively support this attribute.
  + Fix detection on FreeBSD in case of cpuset restriction. Thanks to
    Sebastian Kuzminsky for reporting the problem.
  + Add hwloc_topology_set_userdata_import/export_callback(),
    hwloc_export_obj_userdata() and _userdata_base64() to let
    applications specify how to save/restore the custom data they placed
    in the userdata private pointer field of hwloc objects.
* Tools
  + Add hwloc-annotate program to add string info attributes to XML
  + Add --pid-cmd to hwloc-ps to append the output of a command to each
    PID line. May be used for showing Open MPI process ranks, see the
    hwloc-ps(1) manpage for details.
  + hwloc-bind now exits with an error if binding fails; the executable
    is not launched unless binding suceeeded or --force was given.
  + Add --quiet to hwloc-calc and hwloc-bind to hide non-fatal error
  + Fix command-line pid support in windows tools.
  + All programs accept --verbose as a synonym to -v.
* Misc
  + Fix some DIR descriptor leaks on Linux.
  + Fix I/O device lists when some were filtered out after a XML import.
  + Add missing Backend string info on Solaris in most cases.
  + When merging objects with HWLOC_IGNORE_TYPE_KEEP_STRUCTURE or
    lstopo --merge, compare object types before deciding which one of two
    identical object to remove (e.g. keep sockets in favor of caches).
  + Add some GUID- and LID-related info attributes to OpenFabrics
    OS devices.
  + Only add CPUType socket attributes on Solaris/Sparc. Other cases
    don't report reliable information (Solaris/x86), and a replacement
    is available as the Architecture string info in the Machine object.
  + Document object attributes and string infos in a new Attributes
    section in the documentation.

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