From ae842df5ae90de9e52a14ba99d7a87f41e35e568 Mon Sep 17 00:00:00 2001
From: Richard Loyer <richard.loyer@c42.lu>
Date: Sun, 24 May 2026 17:17:24 +0200
Subject: [PATCH] Chantier 2 clos: CONT low-ROI (opsync gonfle, reshape
 structurel) -> 3 prioritaire

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 docs/02_cont_overhead.md | 2 ++
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 create mode 100644 docs/02_cont_overhead.md

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+# Chantier 2 — CONT/copies prefill: ROI faible, non engage
+416 CONT = ~17/couche GDN (reshape/permute DeltaNet, qwen3next.cpp). 4.6s mesure OPSYNC=serialise; async (defaut) les copies recouvrent le compute -> part reelle << gonfle. cont l.165 = TODO upstream (CUDA non-contig unary), pas removable safe. prefill deja 46-50, pas de bottleneck CONT prouve. Decision: low-ROI, skip. Le vrai gain prefill = GDN sur HTP (chantier 3), pas tailler des copies.