Per the details and schedule outlined in the attached RFC, Mellanox Technologies would like to CMR the new 'coll/hcoll' component. This component enables Mellanox Technologies' latest HPC middleware offering - 'Hcoll'. 'Hcoll' is a high-performance, standalone collectives library with support for truly asynchronous, non-blocking, hierarchical collectives via hardware offload on supporting Mellanox HCAs (ConnectX-3 and above.) To build the component, libhcoll must first be installed on your system, then you must configure OMPI with the configure flag: '--with-hcoll=/path/to/libhcoll'. Subsequent to installing, you may select the 'coll/hcoll' component at runtime as you would any other coll component, e.g. '-mca coll hcoll,tuned,libnbc'. This has been reviewed by Josh Ladd and should be added to cmr:v1.7:reviewer=jladd

git-svn-id: https://svn.open-mpi.org/svn/ompi/trunk@28694 63e3feb5-37d5-0310-a306-e8a459e722fe
Adding the ompi_check_libhcoll.m4 file

git-svn-id: https://svn.open-mpi.org/svn/ompi/trunk@28695 63e3feb5-37d5-0310-a306-e8a459e722fe
Deleting garbage I accidentally committed. Thanks, Nathan\!

git-svn-id: https://svn.open-mpi.org/svn/ompi/trunk@28698 63e3feb5-37d5-0310-a306-e8a459e722fe
Use the converted value instead of calling the macro again.


git-svn-id: https://svn.open-mpi.org/svn/ompi/trunk@28701 63e3feb5-37d5-0310-a306-e8a459e722fe
Add memory hooks override for Gentoo sandbox v2.5, too.  Thanks to
Justin Bronder for the patch.


git-svn-id: https://svn.open-mpi.org/svn/ompi/trunk@28702 63e3feb5-37d5-0310-a306-e8a459e722fe
Shell of the Portals 4 collectives componetn


git-svn-id: https://svn.open-mpi.org/svn/ompi/trunk@28703 63e3feb5-37d5-0310-a306-e8a459e722fe
MCA: add support for performance variables

This commit adds an API for registering and querying performance
variables (mca_base_pvar) in the MCA base. The existing MCA variable
system API has been updated to reflect the new API: MCA variable
groups have performance variables, and new types have been added (double,
unsigned long long) to reflect what is required by the MPI_T
interface. Additionally, the MCA variable group code has been split
into its own set of files: mca_base_var_group.[ch].

Details of the new API can be found in doxygen comments in the header:
mca_base_pvar.h.

Other changes to the variable system:

 - Use an opal_hash_table to speed up variable/group lookup.

 - Clean up code associated with MCA variable types.

 - Registered performance variables are printed by ompi_info -a. In the
   future an option should be added to control this behavior.

Changes to OMPI:

 - Added full support for the MPI_T performance variable interface.
Add example performance variables to ob1: unexpected message queue length, posted receive length