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English(EN) Why a '35GB' Quantized LLM Still OOMs an 80GB GPU: KV Cache, GQA vs. DeepSeek MLA, and the Real VRAM Math

大模型显存解析:量化模型为何仍会导致显存溢出

部署大型语言模型(LLM)时,即使模型的量化大小似乎能容纳,也常常会导致GPU出现意外的显存溢出错误。这是因为模型权重仅占总显存需求的很小一部分。罪魁祸首是KV缓存、激活缓冲区和运行时开销,它们加起来可能使内存占用翻倍甚至三倍。具体来说,一个量化到4位的70B参数模型,其权重可能在35-40GB左右,但拥有64K上下文窗口和2的批处理大小,仅KV缓存就可能推高到近40GB,导致需要80GB以上的显存。 AI

影响 理解显存需求对于高效部署大模型和硬件选型至关重要。

排序理由 技术深度解析大模型显存使用量(超出模型权重部分)。[lever_c_demoted from research: ic=1 ai=1.0]

在 dev.to — LLM tag 阅读 →

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大模型显存解析:量化模型为何仍会导致显存溢出

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技术深度解析大模型显存使用量(超出模型权重部分)。[lever_c_demoted from research: ic=1 ai=1.0]
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报道来源 [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Jason Y. (dev_in_the_fog) ·

    为何一个‘35GB’的量化大模型依然会耗尽80GB GPU显存:KV缓存、GQA对比DeepSeek MLA,以及真实的显存计算

    <p>Every engineer deploying open-weights models hits the same rite of passage:</p> <p>You take a 70B parameter model, quantize it to 4-bit (<code>70B * 0.5 bytes ≈ 35 GB</code>), provision a single 80GB A100 or H100 (or two 24GB GPUs), and launch <code>vLLM</code> or <code>llama.…