Individual skill
prevent-triton-ascend-ub-overflow
Prevent Triton-Ascend Unified Buffer overflow by streaming large logical vectors through bounded compile-time tiles with masked loop iterations. Use when an agent ports a GPU kernel that loads a long sequence or metadata array at once, compilation reports UB pressure, or runtime shapes such as KV-page allocation exceed safe on-chip capacity.
skills/prevent-triton-ascend-ub-overflow/SKILL.md
Source commit 4ab5ee7adf47755ecd42723f55f4c58e38be95a7
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- Last checked
- Nov 4, 2026
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- Repository last updated
- Aug 15, 2026
- License
- Apache-2.0
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- ai Repository topic
- ascend Repository topic
- ascend-npu Repository topic
- npu Repository topic
- triton Repository topic
- triton-ascend Repository topic
- claude-code Repository topic
- codex Repository topic
- opencode Repository topic
- engineering Derived category
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# Prevent Triton-Ascend UB Overflow
## Goal
Keep each live tile within Ascend UB while preserving the semantics of a larger logical operation.
## Workflow
1. List all simultaneously live tensors and estimate their bytes, including padding and multibuffer copies.
2. Select a BLOCK_SIZE that fits the UB budget with safety margin.
3. Replace one load over the maximum logical length with a compile-time loop over BLOCK_SIZE tiles.
4. Recompute global offsets from the loop index and apply a runtime validity mask.
5. Store each completed tile before advancing so earlier tiles do not remain live.
