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We study parallel particle-in-cell (PIC) methods for low-temperature plasmas (LTPs), which discretize kinetic formulations that capture the time evolution of the probability density function of particles as a function of position and…

Computational Engineering, Finance, and Science · Computer Science 2025-08-12 James Almgren-Bell , Nader Al Awar , Dilip S Geethakrishnan , Milos Gligoric , George Biros

Transformer-based large language models (LLMs) have demonstrated remarkable performance across a wide range of real-world tasks, but their inference cost remains prohibitively high due to the quadratic complexity of attention and the memory…

Machine Learning · Computer Science 2026-04-07 Yifu Ding , Xinhao Zhang , Jinyang Guo

Replicability in machine learning (ML) research is increasingly concerning due to the utilization of complex non-deterministic algorithms and the dependence on numerous hyper-parameter choices, such as model architecture and training…

Machine Learning · Computer Science 2024-06-18 Michael Arbel , Alexandre Zouaoui

Similar to other programming models, compilers for SYCL, the open programming model for heterogeneous computing based on C++, would benefit from access to higher-level intermediate representations. The loss of high-level structure and…

Programming Languages · Computer Science 2023-12-21 Ettore Tiotto , Víctor Pérez , Whitney Tsang , Lukas Sommer , Julian Oppermann , Victor Lomüller , Mehdi Goli , James Brodman

Large language models (LLMs) are increasingly used for complex tasks that require multiple generation calls, advanced prompting techniques, control flow, and structured inputs/outputs. However, efficient systems are lacking for programming…

LLVM is an infrastructure for code generation and low-level optimizations, which has been gaining popularity as a backend for both research and industrial compilers, including many compilers for functional languages. While LLVM provides a…

Programming Languages · Computer Science 2019-01-01 Kavon Farvardin , John Reppy

Multi-task learning (MTL) enables simultaneous training across related tasks, leveraging shared information to improve generalization, efficiency, and robustness, especially in data-scarce or high-dimensional scenarios. While deep learning…

Machine Learning · Computer Science 2025-10-31 Fatemeh Bazikar , Hossein Moosaei , Atefeh Hemmati , Panos M. Pardalos

Advancements in large language models (LLMs) have unlocked remarkable capabilities. While deploying these models typically requires server-grade GPUs and cloud-based inference, the recent emergence of smaller open-source models and…

Maximizing training throughput and cost-efficiency of RL for LLMs is essential to democratize this advanced technique. One promising but challenging approach is to deploy such a computational workflow over heterogeneous GPUs. Unlike…

Distributed, Parallel, and Cluster Computing · Computer Science 2025-11-04 Ran Yan , Youhe Jiang , Tianyuan Wu , Jiaxuan Gao , Zhiyu Mei , Wei Fu , Haohui Mai , Wei Wang , Yi Wu , Binhang Yuan

Since the introduction of the GRPO algorithm, reinforcement learning (RL) has attracted increasing attention for LLM post-training, yet training efficiency remains a critical challenge. In mainstream RL frameworks, inference and training…

Machine Learning · Computer Science 2026-05-05 Jian Lu

Large Language Models (LLM) show strong abilities in code generation, but their skill in creating efficient parallel programs is less studied. This paper explores how LLMs generate task-based parallel code from three kinds of input prompts:…

Programming Languages · Computer Science 2026-02-27 Linus Bantel , Moritz Strack , Alexander Strack , Dirk Pflüger

HiCCL (Hierarchical Collective Communication Library) addresses the growing complexity and diversity in high-performance network architectures. As GPU systems have envolved into networks of GPUs with different multilevel communication…

Distributed, Parallel, and Cluster Computing · Computer Science 2024-08-13 Mert Hidayetoglu , Simon Garcia de Gonzalo , Elliott Slaughter , Pinku Surana , Wen-mei Hwu , William Gropp , Alex Aiken

The Single Instruction Multiple Data (SIMD) parallel paradigm is a well-established and heavily-used hardware-driven technique to increase the single-thread performance in different system domains such as database or machine learning.…

Databases · Computer Science 2024-07-29 Johannes Pietrzyk , Alexander Krause , Dirk Habich , Wolfgang Lehner

This work introduces a GPU storage expansion solution utilizing CXL, featuring a novel GPU system design with multiple CXL root ports for integrating diverse storage media (DRAMs and/or SSDs). We developed and siliconized a custom CXL…

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

The growing demands in the training and inference of Large Language Models (LLMs) are accelerating the adoption of scale-up systems that extend server shared memory through the use of Compute Express Link (CXL)-based load/store…

Hardware Architecture · Computer Science 2026-04-01 Karan Pathak , David Atienza , Marina Zapater

Modern computing platforms tend to deploy multiple GPUs (2, 4, or more) on a single node to boost system performance, with each GPU having a large capacity of global memory and streaming multiprocessors (SMs). GPUs are an expensive…

Distributed, Parallel, and Cluster Computing · Computer Science 2021-07-20 Chao Chen , Chris Porter , Santosh Pande

Large language models (LLMs) are increasingly used across research and industry applications, yet their inference efficiency remains a significant challenge. As the computational power of modern GPU architectures continuously improves,…

Communication has become a first-order bottleneck in large-cale GPU workloads, and existing distributed compilers address it mainly by overlapping whole compute and communication kernels at the stream level. This coarse granularity incurs…

Distributed, Parallel, and Cluster Computing · Computer Science 2026-04-06 Xinwei Qiang , Yue Guan , Zhengding Hu , Keren Zhou , Yufei Ding , Adnan Aziz

Current trends in Machine Learning~(ML) inference on hardware accelerated devices (e.g., GPUs, TPUs) point to alarmingly low utilization. As ML inference is increasingly time-bounded by tight latency SLOs, increasing data parallelism is not…

Distributed, Parallel, and Cluster Computing · Computer Science 2019-02-01 Paras Jain , Xiangxi Mo , Ajay Jain , Alexey Tumanov , Joseph E. Gonzalez , Ion Stoica