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Widen Triton TBE forward gather issue (#4490) - #4490

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stashuk-olek wants to merge 7 commits into
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stashuk-olek:export-D114280947
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Widen Triton TBE forward gather issue (#4490)#4490
stashuk-olek wants to merge 7 commits into
meta-pytorch:mainfrom
stashuk-olek:export-D114280947

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@stashuk-olek

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

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Summary:

Issue up to eight independent index gathers per loop iteration on profitable long-bag shapes. The wider loop increases memory-level parallelism while retaining the four-wide path for shapes where register pressure dominates.

Reviewed By: axeisghost

Differential Revision: D114280947

@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 D114280947.

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

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
@meta-codesync meta-codesync Bot changed the title Widen Triton TBE forward gather issue Widen Triton TBE forward gather issue (#4490) Aug 5, 2026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 5, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
@stashuk-olek
stashuk-olek force-pushed the export-D114280947 branch 2 times, most recently from fd0fa01 to 5d0ba15 Compare August 6, 2026 16:18
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
@stashuk-olek
stashuk-olek force-pushed the export-D114280947 branch 2 times, most recently from da9622f to 2f2900b Compare August 6, 2026 20:11
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 6, 2026
Summary:

Small tweak as well, a bit more unroll.

Reviewed By: axeisghost

Differential Revision: D114280947
@meta-codesync meta-codesync Bot changed the title Widen Triton TBE forward gather issue (#4490) Widen Triton TBE forward gather issue 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
)

Summary:

Reduce the dout reduction tile from 16 to 8 in the unweighted short-run, separate long-run accumulation, and fused long-run kernels. The smaller tile reduces live vector state and register pressure on B200 while retaining FP32 accumulation and the existing rowwise optimizer update. Weighted kernels remain unchanged.

Reviewed By: axeisghost

Differential Revision: D114403703
Summary:

Process multiple bags per Triton program where the workload has enough parallelism. This amortizes program overhead and exposes independent loads without changing the embedding reduction.

Reviewed By: axeisghost

Differential Revision: D114280197
Summary:

Issue up to eight independent index gathers per loop iteration on profitable long-bag shapes. The wider loop increases memory-level parallelism while retaining the four-wide path for shapes where register pressure dominates.

Reviewed By: axeisghost

Differential Revision: D114280947
@meta-codesync meta-codesync Bot changed the title Widen Triton TBE forward gather issue Widen Triton TBE forward gather issue (#4490) Aug 8, 2026
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 8, 2026
Summary:

Issue up to eight independent index gathers per loop iteration on profitable long-bag shapes. The wider loop increases memory-level parallelism while retaining the four-wide path for shapes where register pressure dominates.

Reviewed By: axeisghost

Differential Revision: D114280947
stashuk-olek added a commit to stashuk-olek/torchrec that referenced this pull request Aug 8, 2026
Summary:

Issue up to eight independent index gathers per loop iteration on profitable long-bag shapes. The wider loop increases memory-level parallelism while retaining the four-wide path for shapes where register pressure dominates.

Reviewed By: axeisghost

Differential Revision: D114280947
@meta-codesync meta-codesync Bot closed this in 1d2986c Aug 8, 2026
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