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vLLM KV Cache Math: Why My 24GB GPU Served Only 4 Requests at Once

I put Llama 3.1 8B behind vLLM on a single 24GB card, pointed a load test with 20 concurrent users at it, and watched the stats line: Running: 4 reqs, Waiting: 16 reqs, GPU KV cache usage: 98.1% Four. I had been told vLLM does continuous batching and can run hundreds of sequences at once. The defau…

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  1. 2026-10-23 11:37 · DEV Community — Machine Learning
    vLLM KV Cache Math: Why My 24GB GPU Served Only 4 Requests at Once

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