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Reduce Triton TBE backward reduction pressure (#4487) - #4487

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Reduce Triton TBE backward reduction pressure (#4487)#4487
stashuk-olek wants to merge 4 commits into
meta-pytorch:mainfrom
stashuk-olek:export-D114273026

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@stashuk-olek

@stashuk-olek stashuk-olek commented Aug 5, 2026

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Summary:

Restructure short- and long-run gradient accumulation to reduce serialized reduction pressure. The new reduction schedule exposes more independent work while preserving the existing exact rowwise optimizer update.

Reviewed By: axeisghost

Differential Revision: D114273026

@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Aug 5, 2026
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@stashuk-olek has exported this pull request. If you are a Meta employee, you can view the originating Diff in D114273026.

@meta-codesync meta-codesync Bot changed the title Reduce Triton TBE backward reduction pressure Reduce Triton TBE backward reduction pressure (#4487) Aug 5, 2026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Tweaking a bit to hide more from critical path.

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
@stashuk-olek
stashuk-olek force-pushed the export-D114273026 branch 2 times, most recently from 0f998cf to ac5dcff Compare August 6, 2026 20:10
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Tweaking a bit to hide more from critical path.

Reviewed By: axeisghost

Differential Revision: D114273026
@meta-codesync meta-codesync Bot changed the title Reduce Triton TBE backward reduction pressure (#4487) Reduce Triton TBE backward reduction pressure Aug 7, 2026
Summary:

Use BoundsCheckMode.V2 for Triton TBE standalone index validation. This preserves the existing warning and offset-repair behavior while reducing validation overhead before Triton forward.

Reviewed By: axeisghost, TroyGarden

Differential Revision: D114279989
Summary:

Validate and repair indices inside supported unweighted, non-VBE Triton forward kernels. Unsupported configurations retain the CUDA v2 fallback, while fused checked loads preserve warning accumulation without a separate full-index pass.

Reviewed By: TroyGarden, axeisghost

Differential Revision: D114284802
)

Summary:

Convert long bags over small tables into per-bag row histograms followed by a tensor-core dot. Generic row, dimension, and bag-size predicates select the route, and checked loads preserve fused bounds behavior.

Reviewed By: axeisghost

Differential Revision: D114273027
Summary:

Restructure short- and long-run gradient accumulation to reduce serialized reduction pressure. The new reduction schedule exposes more independent work while preserving the existing exact rowwise optimizer update.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 8, 2026
Summary:

Restructure short- and long-run gradient accumulation to reduce serialized reduction pressure. The new reduction schedule exposes more independent work while preserving the existing exact rowwise optimizer update.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 8, 2026
Summary:

Restructure short- and long-run gradient accumulation to reduce serialized reduction pressure. The new reduction schedule exposes more independent work while preserving the existing exact rowwise optimizer update.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 8, 2026
Summary:

Restructure short- and long-run gradient accumulation to reduce serialized reduction pressure. The new reduction schedule exposes more independent work while preserving the existing exact rowwise optimizer update.

Reviewed By: axeisghost

Differential Revision: D114273026
@meta-codesync meta-codesync Bot changed the title Reduce Triton TBE backward reduction pressure Reduce Triton TBE backward reduction pressure (#4487) Aug 8, 2026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 8, 2026
Summary:

Restructure short- and long-run gradient accumulation to reduce serialized reduction pressure. The new reduction schedule exposes more independent work while preserving the existing exact rowwise optimizer update.

Reviewed By: axeisghost

Differential Revision: D114273026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 8, 2026
Summary:

Restructure short- and long-run gradient accumulation to reduce serialized reduction pressure. The new reduction schedule exposes more independent work while preserving the existing exact rowwise optimizer update.

Reviewed By: axeisghost

Differential Revision: D114273026
@meta-codesync meta-codesync Bot closed this in aab7653 Aug 8, 2026
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