Price CP2 recompute per rank on each layer type's layout - #978

Draft

bradhilton wants to merge 37 commits into

dalinar/recompute-mixer-floorfrom

dalinar/cp-layout-recompute-floor

Commits on Sep 25, 2026

Mirror the bytes a recomputed CP attention keeps for backward

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cdf4d29
Price CP2 recompute per rank on each layer type's layout

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5899a2d
Bound CP2 layout pricing from below and count flex's own LSE

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0e7255c
Guard the layout gate and state why the lower bound rounds down

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9b4e9d7
Run the CP layout memory tests in the Megatron CI lane

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33185b4

Commits on Sep 26, 2026

Charge single-head view copies and partial-tape indices; time layout planning

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c1500ca
Keep partial-tape indices when the first stage drops its tape

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4368998
Merge the rebased recomputed-mixer floor into per-rank CP2 layouts

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a4b6a26
Merge the recomputed-mixer floor's review fixes into per-rank CP2 layouts

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7583308
Test the combine-extent floor through per-rank layouts

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b4a619e

Commits on Sep 27, 2026

Pin that the layout path's combine floor adds no second TE growth

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0f59d7c

Commits on Sep 28, 2026

Merge commit 'a0feb0c2577bf74fb14028f85fd0003a082175d6' into HEAD
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8d7c3cf
Price adapter gradients against each rank's layout boundaries

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be1db0c
Pin TE growth and a stage between the combine floor and its TE

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42a2e2b
Pair each CP rank's adapter-gradient extra with its own floor

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0606917
Merge #963's sequential gradient groups; walk each rank's groups in turn

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67f8ae7
Test split lower bounds and admission parity with pending gradients

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22f67b0
Merge #963's closed-form group order

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a487f98
Resolve each slot's pending gradients once across ranks

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92dd4e0
Test the split lower bound with two gradient slots

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bd5a83a
Pin the two-slot lower bound's own extra

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632dea9
Merge #963's layer-mismatch test

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7863832
Merge #963's staged head and decoder pricing

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977dea3
Merge #963's head-stage row state

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13dc898
Merge #963's traced head staging

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a5e9d75
Merge #963's fused-statistics proof for head staging

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c72ddf8
Merge #963's TE-free profile readings

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f1bbd63
Merge #963's strict staged head statistics and V1t revert

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34c2a57
Merge #963's per-kernel fused-statistics proof

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d881fba
Merge #963's strict binding per thread, group and staged admission

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6dc567b

Commits on Sep 29, 2026

Price CP2 recompute per rank on each layer type's layout, on the extracted layout

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653136d
Merge #963's replay hardening (e39b4603) into the CP layout port

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c847095
Record #978's pre-extraction history (6dc567b03) as ported

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0684d70
Merge #963's replay test coverage (bab7be10a) into the CP layout port

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4c5a4d1
Refuse CP layout facts live pricing cannot produce

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e204ee8
Merge #963's Megatron-lane entry (1763c67dc) into the CP layout port

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645c906
Test that an ungrouped estimate cannot record CP layouts

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bf79e44