rail optimized

Derive a 16-leaf, 8-spine fabric from 512 endpoints, trace local and cross-leaf routes, and check what rail placement and oversubscription actually guarantee.

Localize a slow fabric rail with matched tests, path comparisons and counter deltas. Separate an independent-bandwidth sum from collective completion time.

Count one complete rail, then distinguish logical links from cages, optical modules and cable assemblies. Derive power from the same physical inventory.

Map stable endpoints to rails, choose supported cables from measured routes, and verify topology before interpreting collective performance.

Follow corresponding GPU positions through a rail, including the leaf and spine links needed when one rail outgrows a switch.