Network-cost reduction of a rail-only design (spine tier eliminated; cross-rail traffic forwarded through the scale-up domain) versus a full-bisection fat-tree, per the MIT CSAIL/Meta proposal; network power reduced 37-75%
38-77%derived
| Value kind | derived — Derived values are guide calculations; their result is only as fixed as the stated inputs, scope, and method. |
|---|---|
| Caveat | Paper-modeled savings, not a production report. All-to-all forwarding overhead differs by paper version (v4: 4.1-5.6%; v5: 8.2-11.2% completion-time overhead) — cite the version. Assumes the collective profile stays rail-aligned. |
| As of | 2024-07 |
| Source | arXiv:2307.12169 (MIT CSAIL / Meta) |
| Review | checking…review by 2026-09-30 · fast cadence |
| Recorded changes | last 2026-08-24 · 2 revisions tracked |
| Claim id | rail-only-network-cost-reduction |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.