What precision are the numbers? Integer or floating point? Do we care about numerical stability? Can we assume we're on an NVIDIA GPU with threads, warps, CTAs, and grids? How much memory bandwidth do we have? Is that array of numbers big or really big?

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• URL: https://x.com/xlrndo/status/2058691325302894659
• Author: xlrndo (@xlrndo)
• Posted: 2026-05-24 23:27:15

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1/ @xlrndo

What precision are the numbers? Integer or floating point? Do we care about numerical stability? Can we assume we’re on an NVIDIA GPU with threads, warps, CTAs, and grids? How much memory bandwidth do we have? Is that array of numbers big or really big?

Too many questions to have any kind of single answer. It’s not a bad interview question if it’s used as a jumping off point for the candidate to demonstrate their knowledge.

2/ @AgileJebrim

@xlrndo

https://x.com/agilejebrim/status/2058562643158352101?s=46&t=ZbNecpPBsBMrvteeaA6IcA

3/ @AgileJebrim

@xlrndo

Portable across a wide range of GPU hardware. You can assume 32-wide waves, 256-wide workgroups, and 64KB shared memory. The memory bandwidth is unlikely to affect the answer.

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