TLDR Tech / DevOps
The Inference Tax: How Prefix-Aware Routing Eliminates the Hidden Cost of LLMs at Scale
DigitalOcean partnered with Inferact to slash AI inference costs by up to 4x through prefix-aware routing and caching in vLLM, recovering up to 340 GPU-hours daily at 10 million requests by eliminating redundant computation of shared prompt prefixes. The optimization, built for DigitalOcean's Dedicated Inference platform, will roll out to all Serverless Inference customers in the coming weeks, leveraging AMD Instinct MI325X GPUs' 192GB HBM3 and NVIDIA H200's 141GB HBM3e to maintain substantially larger KV cache capacity and boost cache hit rates from ~25% to 75%+.
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