xAI
Training-infrastructure questions, GPU utilisation reasoning, and low-level optimisation.
- Active questions
- 3
- Rounds covered
- 2
- Last reviewed
- Aug 27, 2026
Reported questions
The full collection. Each entry shows how many independent reports it has and when it was last seen in a live loop.
- ML designHardSingle report · 2 reports
GPU utilisation is stuck at 45%
A training job holds 45% utilisation on an otherwise idle node. List the candidate bottlenecks in the order you would check them, and the measurement that confirms each.
Last seen Aug 16, 2026Study: ML systems → - ML designHardCorroborated · 4 reports
Cut p99 serving latency in half
An inference service meets its p50 target but misses p99 by 3x. Walk through how you would diagnose it, then which of batching, caching, quantisation, or admission control you would reach for and why.
Last seen Aug 27, 2026Study: ML systems → - CodingMediumCorroborated · 4 reports
Longest window with at most k distinct values
Given an array and an integer k, return the length of the longest contiguous window containing at most k distinct values. Follow-up: return the window itself, and handle a streaming input where you cannot revisit earlier elements.
Last seen Aug 19, 2026Study: Core coding patterns →
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