arXiv Machine Learning

Scaling LLM Inference via Parallelism: Throughput-Latency Trade-off

The paper investigates how different parallelism strategies—tensor parallelism (TP), pipeline parallelism (PP), and hybrids—affect the trade‑off between time‑to‑first‑token (TTFT) and inter‑token latency (ITL) in large language model inference. It introduces a framework that maps feasible TTFT‑ITL regions and Pareto frontiers for various workloads, revealing a shift from TP‑dominant to PP‑dominant configurations as prefill work increases. The authors also present an SLO‑aware selection method based on goodput, showing that stricter TTFT goals favor PP, while relaxed constraints move toward TP, and they demonstrate that longer contexts further favor PP for scalability and SLO attainment.

arXiv AI
Jul 7

Data Driven Optimization of GPU efficiency for Distributed LLM-Adapter Serving

arXiv:2602. 24044v2 Announce Type: replace-cross Abstract: Large Language Model (LLM) adapters enable low-cost model specialization, but introduce complex caching and scheduling challenges in distributed serving systems where hundreds of adapters must be hosted concurrently.

By Ferran Agullo, Joan Oliveras, Chen Wang, Alberto Gutierrez-Torre, Olivier Tardieu, Alaa Youssef, Jordi Torres, Josep Ll. Berral
arXiv AI
Sep 28

Scepsy: Serving Agentic Workflows Using Aggregate LLM Pipelines

Scepsy is a serving system designed to efficiently schedule arbitrary multi‑LLM agentic workflows on GPU clusters. It leverages the observation that each LLM’s share of execution time remains relatively stable across requests, profiling LLMs under various parallelism levels to build an Aggregate LLM Pipeline that predicts throughput and latency. Using this predictor, Scepsy searches for optimal GPU allocations—balancing fractional GPU shares, tensor parallelism, and replica counts—and then heuristically places them on the cluster to reduce fragmentation and honor network topology, achieving up to 2.5× higher throughput and 1.0–3.3× lower latency compared to baseline approaches.

By Otto White, Marcel Wagenl\"ander, Britannio Jarrett, Xijin Zhao, Yanda Tao, Pedro Silvestre, Guo Li, Huanzhou Zhu, Llu\'is Vilanova, Peter Pietzuch