Enabling Efficient Serverless Inference Serving for LLM (Large Language Model) in the Cloud

TL;DR

This paper reviews solutions for reducing cold start latency in serverless inference for large language models, highlighting the ServerlessLLM system's innovations in checkpoint loading and resource management.

Contribution

It introduces ServerlessLLM, a novel system that significantly reduces startup latency for LLM inference in serverless environments through multitier checkpoint loading and optimized scheduling.

Findings

ServerlessLLM reduces startup time by 6-8x compared to existing methods.

The system leverages GPU memory and storage for efficient checkpoint loading.

It improves scalability and resource utilization in serverless LLM inference.

Abstract

This review report discusses the cold start latency in serverless inference and existing solutions. It particularly reviews the ServerlessLLM method, a system designed to address the cold start problem in serverless inference for large language models. Traditional serverless approaches struggle with high latency due to the size of LLM checkpoints and the overhead of initializing GPU resources. ServerlessLLM introduces a multitier checkpoint loading system, leveraging underutilized GPU memory and storage to reduce startup times by 6--8x compared to existing methods. It also proposes live inference migration and a startup-time-optimized model scheduler, ensuring efficient resource allocation and minimizing delays. This system significantly improves performance and scalability in serverless environments for LLM workloads. Besides ServerlessLLM, several other methods from recent research literature, including Rainbowcake, are reviewed in this paper. Further discussions explore how FaaS providers tackle cold starts and the possible future scopes.