Hi Hal.
The following three patches are adding root and compute node guid files
options for fat-tree routing, reading these files in fat-tree, and
taking care of non-compute nodes when creating fat-tree order file.
[1/3] Added two options:
ftree_root_guid_file - file that contains list of root guids
ftree_cn_guid_file - file that contains list of compute node guids
For now, these options are exposed via options file only.
[2/3] Fat-tree routing reads root guid file and compute node guid file,
and creates map of roots and compute nodes (CNs) to be used later.
[3/3] Non-CNs are treated as "dummies" when creating fat-tree order file,
because they are not participating in the MPI all-to-all communication.
-- Yevgeny
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