TLDR Gripe / Practical
vLLM's EPD Improves Multimodal Serving Through Encoder Separation
Engineers at vLLM have detailed the process of encoder disaggregation (EPD), a technique that decouples the encoding process from the prefill and decode phases in multimodal serving. This allows for independent scaling of resources. Key improvements involve handling metadata-only requests to prevent redundant media processing, implementing specific runners for encoder tasks, supporting remote embedding transfers via NIXL and Mooncake, and enabling the reuse of cross-encoder outputs. Performance tests using DeepSeek V4.1 Flash demonstrated increased throughput and faster time-to-first-token compared to conventional integrated systems.
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