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Continuous and standard batching strategies differ fundamentally in their prioritization, which leads to distinct performance trade-offs. Continuous batching employs a prefilling-prioritized approach, where new requests are added to the batch as soon as computational resources become available. This method maximizes system throughput and hardware utilization but can increase the processing latency for requests already in the batch. Conversely, standard batching is decoding-prioritized, meaning it processes an entire batch to completion before handling new requests. This ensures lower latency for the active batch but results in reduced device utilization and overall system throughput.

Comparison of Continuous (Prefilling-Prioritized) vs. Standard (Decoding-Prioritized) Batching

Given the company's primary objective described in the case study, should they implement a *decoding-prioritized* strategy (which processes each batch of requests to full completion before starting the next) or a *prefilling-prioritized* strategy (which adds new requests to the batch as soon as any processing capacity becomes available)? Justify your choice by explaining the key trade-off involved.

Inference System Optimization

An AI development team is deploying two different services. Service X is a real-time conversational agent where minimizing the response time for each user's turn is the top priority. Service Y is an offline system that processes a massive queue of documents for analysis, where maximizing the total number of documents processed per day is the main goal. Considering the trade-offs between different batching methods, which approach is best suited for each service?

A key difference between continuous and standard batching methods lies in how they execute the prefilling and decoding phases. In continuous batching, prefilling and decoding can occur simultaneously across different sequences within the active batch. Conversely, in standard batching, these two phases must be performed sequentially for the entire batch before moving on.

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