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We present the design, implementation and engineering experience in building and deploying MegaScale, a production system for training large language models (LLMs) at the scale of more than 10,000 GPUs. Training LLMs at this scale brings…

Fine-tuning pre-trained large language models (LLMs) with limited hardware presents challenges due to GPU memory constraints. Various distributed fine-tuning methods have been proposed to alleviate memory constraints on GPU. However,…

Artificial Intelligence · Computer Science 2024-04-18 Taeho Kim , Yanming Wang , Vatshank Chaturvedi , Lokesh Gupta , Seyeon Kim , Yongin Kwon , Sangtae Ha

Large language models (LLMs) are highly compute- and memory-intensive, posing significant demands on high-performance GPUs. At the same time, advances in GPU technology driven by shrinking transistor sizes and lower operating voltages have…

Hardware Architecture · Computer Science 2026-01-29 Duo Chai , Zizhen Liu , Shuhuai Wang , Songwei Pei , Cheng Liu , Huawei Li , Shangguang Wang

GPUs have limited memory and it is difficult to train wide and/or deep models that cause the training process to go out of memory. It is shown in this paper how an open source tool called Large Model Support (LMS) can utilize a high…

Distributed, Parallel, and Cluster Computing · Computer Science 2018-11-30 Samuel Matzek , Max Grossman , Minsik Cho , Anar Yusifov , Bryant Nelson , Amit Juneja

Large language model (LLM) training today runs on clusters spanning thousands of GPUs. While this scale enables rapid model advances, developing, debugging, and performance-tuning the training framework inevitably becomes complex and…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-05-18 Shaoke Xi , ChonLam Lao , Boyi Jia , Jiaqi Gao , Zhipeng Zhang , Jiamin Cao , Brian Sutioso , Erci Xu , Minlan Yu , Kui Ren , Yong Li , Zhengping Qian , Ennan Zhai , Jingren Zhou

Training and fine-tuning large language models (LLMs) with hundreds of billions to trillions of parameters requires tens of thousands of GPUs, and a highly scalable software stack. In this work, we present a novel four-dimensional hybrid…

Large language models represent a groundbreaking shift in generative AI. Yet, these advances come with a significant challenge: the high cost of model serving. To mitigate these costs, consumer-grade GPUs emerge as a more affordable…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-10-17 Lewei Jin , Yongqi Chen , Kui Zhang , Yifan Zhuo , Yi Gao , Bowei Yang , Zhengong Cai , Wei Dong

The emergence of large language models (LLMs) has revolutionized AI development, yet the resource demands beyond a single cluster or even datacenter, limiting accessibility to well-resourced organizations. Decentralized training has emerged…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-09-29 Haotian Dong , Jingyan Jiang , Rongwei Lu , Jiajun Luo , Jiajun Song , Bowen Li , Ying Shen , Zhi Wang

We present LLMQ, an end-to-end CUDA/C++ implementation for medium-sized language-model training, e.g. 3B to 32B parameters, on affordable, commodity GPUs. These devices are characterized by low memory availability and slow communication…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-12-18 Erik Schultheis , Dan Alistarh

Large Language Models (LLMs) are increasingly deployed on converged Cloud and High-Performance Computing (HPC) infrastructure. However, as LLMs handle confidential inputs and are fine-tuned on costly, proprietary datasets, their heightened…

Performance · Computer Science 2025-09-24 Marcin Chrapek , Marcin Copik , Etienne Mettaz , Torsten Hoefler

Dramatic increases in the capabilities of neural network models in recent years are driven by scaling model size, training data, and corresponding computational resources. To develop the exceedingly large networks required in modern…

Machine Learning · Computer Science 2025-04-15 Jared Fernandez , Luca Wehrstedt , Leonid Shamis , Mostafa Elhoushi , Kalyan Saladi , Yonatan Bisk , Emma Strubell , Jacob Kahn

Deploying a large language model (LLM) inference service remains costly because centralized serving depends on specialized GPU clusters and high-bandwidth interconnects in datacenters. An appealing alternative is to leverage collaborative…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-10-01 Chris Tong , Youhe Jiang , Gufeng Chen , Tianyi Zhao , Sibian Lu , Wenjie Qu , Eric Yang , Lynn Ai , Binhang Yuan

Large language models (LLMs) have demonstrated remarkable success as foundational models, benefiting various downstream applications through fine-tuning. Recent studies on loss scaling have demonstrated the superior performance of larger…

Distributed, Parallel, and Cluster Computing · Computer Science 2023-12-25 Sajal Dash , Isaac Lyngaas , Junqi Yin , Xiao Wang , Romain Egele , Guojing Cong , Feiyi Wang , Prasanna Balaprakash

The use of GPUs has proliferated for machine learning workflows and is now considered mainstream for many deep learning models. Meanwhile, when training state-of-the-art personal recommendation models, which consume the highest number of…

Hardware Architecture · Computer Science 2020-11-12 Bilge Acun , Matthew Murphy , Xiaodong Wang , Jade Nie , Carole-Jean Wu , Kim Hazelwood

Training large language models (LLMs) in the cloud faces growing memory bottlenecks due to the limited capacity and high cost of GPUs. While GPU memory offloading to CPU and NVMe has made large-scale training more feasible, existing…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-11-19 Sabiha Afroz , Redwan Ibne Seraj Khan , Hadeel Albahar , Jingoo Han , Ali R. Butt

Large Language Models (LLMs) are rapidly becoming critical infrastructure for enterprise applications, driving unprecedented demand for GPU-based inference services. A key operational challenge arises from the two-phase nature of LLM…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-02-04 Ruihan Lin , Zezhen Ding , Zean Han , Jiheng Zhang

Aligning future system design with the ever-increasing compute needs of large language models (LLMs) is undoubtedly an important problem in today's world. Here, we propose a general performance modeling methodology and workload analysis of…

Hardware Architecture · Computer Science 2024-07-23 Joyjit Kundu , Wenzhe Guo , Ali BanaGozar , Udari De Alwis , Sourav Sengupta , Puneet Gupta , Arindam Mallik

LLM-based applications have been widely used in various industries, but with the increasing of models size, an efficient large language model (LLM) inference system is an urgent problem to be solved for service providers. Since the…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-09-30 Xing Chen , Rong Shi , Lu Zhao , Lingbin Wang , Xiao Jin , Yueqiang Chen , Hongfeng Sun

The rapid growth of large language models is driving organizations to expand their GPU clusters, often with GPUs from multiple vendors. However, current deep learning frameworks lack support for collective communication across heterogeneous…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-02-02 Heehoon Kim , Jaehwan Lee , Taejeoung Kim , Jongwon Park , Jinpyo Kim , Pyongwon Suh , Ryan H. Choi , Sangwoo Lee , Jaejin Lee

Large deep learning models have demonstrated strong ability to solve many tasks across a wide range of applications. Those large models typically require training and inference to be distributed. Tensor parallelism is a common technique…