Amazon SageMaker HyperPod Introduces Disaggregated Prefill and Decode for LLM Inference Optimization
AWS has updated Amazon SageMaker HyperPod with support for Disaggregated Prefill and Decode (DPD). Large language model (LLM) inference consists of two distinct phases: the compute-heavy prefill phase and the memory-bandwidth-bound decode phase. By separating these phases onto dedicated GPU instances, DPD minimizes resource contention and improves overall latency and throughput.
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| Aspect | Before / Alternative | After / This |
|---|---|---|
| GPU Resource Allocation | A single GPU pool handles both compute-heavy prefill and memory-bound decode phases simultaneously. | Dedicated, isolated GPU pools are allocated independently for prefill and decode workloads. |
| Key-Value Cache Handling | KV caches are stored locally within the same GPU memory throughout the entire inference lifecycle. | KV caches are transferred across specialized node clusters to link prefill and decode stages. |
| Latency Predictability | Frequent latency spikes occur due to scheduling contention between prefill and decode operations. | Decoupled execution paths ensure predictable latency and highly optimized resource utilization. |
Source: AWS What's New
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