SplitLLM: Collaborative Inference of LLMs for Model Placement and Throughput Optimization

• URL: http://arxiv.org/abs/2410.10759v2
• Date: Wed, 16 Oct 2024 16:31:37 GMT
• Title: SplitLLM: Collaborative Inference of LLMs for Model Placement and Throughput Optimization
• Authors: Akrit Mudvari, Yuang Jiang, Leandros Tassiulas,
• Abstract summary: Large language models (LLMs) play a crucial role in our daily lives due to their ability to understand and generate human-like text. In this report, we design a collaborative inference architecture between a server and its clients to alleviate the throughput limit. We show in the experiments that we are able to efficiently distribute the workload allowing for roughly 1/3 reduction in the server workload.
• Score: 8.121663525764294
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large language models (LLMs) have been a disruptive innovation in recent years, and they play a crucial role in our daily lives due to their ability to understand and generate human-like text. Their capabilities include natural language understanding, information retrieval and search, translation, chatbots, virtual assistance, and many more. However, it is well known that LLMs are massive in terms of the number of parameters. Additionally, the self-attention mechanism in the underlying architecture of LLMs, Transformers, has quadratic complexity in terms of both computation and memory with respect to the input sequence length. For these reasons, LLM inference is resource-intensive, and thus, the throughput of LLM inference is limited, especially for the longer sequences. In this report, we design a collaborative inference architecture between a server and its clients to alleviate the throughput limit. In this design, we consider the available resources on both sides, i.e., the computation and communication costs. We develop a dynamic programming-based algorithm to optimally allocate computation between the server and the client device to increase the server throughput, while not violating the service level agreement (SLA). We show in the experiments that we are able to efficiently distribute the workload allowing for roughly 1/3 reduction in the server workload, while achieving 19 percent improvement over a greedy method. As a result, we are able to demonstrate that, in an environment with different types of LLM inference requests, the throughput of the server is improved.

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