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Nodeset: add --index command to cluset/nodeset#637
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Add a --index NODE command that outputs the zero-based position of a node in the resulting set, the reverse of -I/--slice. Works in both NodeSet and RangeSet (-R) modes. Signed-off-by: Stephane Thiell <sthiell@stanford.edu>
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Add a
--index NODEcommand tocluset/nodesetthat outputs the zero-based position of a node in the resulting node set. It is the command-line front-end to theNodeSet.index()/RangeSet.index()methods (#631) and the inverse of-I/--slice. Suggested by @mattaezell in #631.A node that is not in the set prints an error on stderr and exits non-zero (like
list.index()), so it doubles as a membership test:Notes:
-c/-e/-f/...), computed on the final set, so it honors-x/-i/-X,-I/--sliceand stdin, and works in RangeSet mode (-R).--indexcombined with--pickis rejected, since random sampling would make the position meaningless.-e/--expand); the docs cover the non-obvious cases (alphabetical pattern order, multidimensional flattening) and warn it is not guaranteed to match a resource manager's rank such as Slurm's$SLURM_NODEID.See #631.