Local large language model deployments are unexpectedly crashing at around 32,000 tokens, despite appearing to fit within available GPU memory. This issue isn't due to model weights exceeding VRAM, but rather the accumulation of the KV cache, a data structure that grows linearly with the conversation length and isn't typically factored into memory budgeting. Developers should now consider both model weight size and KV cache size when assessing GPU memory requirements, as the latter can quickly exhaust available resources, particularly with longer conversations.
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