The Sixth Workshop on Challenges and Opportunities of Efficient and Performant Storage Systems (CHEOPS'26)

Held in conjunction with EuroSys 2026 on April 27th 2026, Edinburgh, Scotland, UK

Program

Time Speaker / Authors Content
09:00-09:10   Welcome from the PC chairs
09:15-10:15 Keynote – Professor Jason Chun Xue (MBZUAI) Unlocking the Full Potential of 3D NAND Flash
10:15-10:30 Xueze Kang, Guangyu Xiang, Yuxin Wang, Hao Zhang, Yuchu Fang, Yuhang Zhou, Zhenheng Tang, Youhui Lv, Eliran Maman, Mark Wasserman, Alon Zameret, Zhipeng Bian, Shushu Chen, Zhiyou Yu, Jin Wang, Xiaoyu Wu, Yang Zheng, Chen Tian, Xiaowen Chu ElasWave: An Elastic-Native System for Scalable Hybrid-Parallel Training
10:30-11:00   Coffee break

Session – Optimizing Storage Systems

Chair: Pr. Pierre Olivier

Time Speaker / Authors Content
11:00-11:30 I. Malliotakis, A. Bilas, A. Papagiannis, M. Marazakis xHeap: Transparent Hugepage Optimizations for Memory Offloading
11:30-12:00 R. Ilyas, S. Kumar, T. Gilray, K. Micinski, S. Byna Optimizing I/O Performance of Parallel Iterated Relational Algebra Applications
12:00-12:30 K. Kampadais, A. Chazapis, A. Bilas Optimizing Longhorn for High Performance Cloud-native Storage
Time    
12:30-14:00   Lunch break

Session – Understanding the I/O Stack

Chair: Pr. Suren Byna

Time Speaker / Authors Content
14:00-14:30 M. Naas, P. Olivier, S. Rubini, F. Singhoff, J. Boukhobza Dissecting Storage I/O Tracing Overhead of eBPF: A Component-Level Analysis
14:30-14:45 M. Bahna, D. Fitzsimmons, A. Barbalace Exploring Performance and Power of CXL Memory and PCIe 5.0 NVMe for Memory-Hungry Workloads
14:45-15:15 H. Mahni, L. Nicolas, J. Boukhobza Context Matters: Constant-Time File Lifecycle Prediction from File Creation Call Stacks
15:15-15:30 H. S. Lim, K. V. Nguyen, N. N. Chaudhary Neural Network Training Under Sequential-Storage I/O Constraints
Time    
15:30-16:00   Coffee break

Session – Metadata Management

Chair: TBD

Time Speaker / Authors Content
16:00-16:30 A. Fuad, S. Vashisth, O. Balmau, B. Kemme PostLearn: Towards A Learned Index For PostgreSQL
16:30-17:00 G. Xanthakis, A. Katsarakis, G. Saloustros, A. Bilas Compaction Size and Tail Latency in LSM-based Key-Value Stores
17:00-17:30 M. Tranzer, S. Ibrahim ROR: Using Reads for Fast and Efficient Data Repair in Erasure-Coded Storage Systems
     

Keynote Speaker

Pr. Chun Jason Xue
Title: Unlocking the Full Potential of 3D NAND Flash

Abstract: This talk will present a decade of research on unlocking the full potential of 3D NAND flash storage through cross-layer optimization. As flash storage now dominates data center capacity, the industry faces a fundamental scaling trilemma where higher density simultaneously degrades reliability, performance, and lifetime. The research path begins with deep physical characterization, establishing that accurate understanding of device behavior, including retention, read disturb, and wear, must be the foundation of any optimization. Building on these insights, the work progresses to read performance optimization, exploiting error asymmetry and using designated cells as reliability indicators to achieve near-zero read retry rates. The research then demonstrates that smart data encoding can transform how data interacts with flash physics, turning invalidated data and entropy-aware coding into tools for extending device lifetime. Most recently, the work challenges the long-held constraint of sequential page programming, showing that strategic reprogramming can fundamentally reshape the write path for significant latency gains. Throughout this progression, the unifying principle is cross-layer co-design: by allowing information to flow between device physics, flash chips, controllers, and applications, it becomes possible to push the Pareto frontier on reliability, performance, and lifetime simultaneously rather than trading one for another.

Bio: Chun Jason Xue is a Professor in the Department of Computer Science at the Mohamed bin Zayed University of Artificial Intelligence. He received his Ph.D. from the University of Texas at Dallas in 2007 and spent 16 years at the City University of Hong Kong before joining MBZUAI in 2024. Professor Xue was elected IEEE Fellow, Class of 2026, for his contributions to optimizing the performance of non-volatile memory storage systems, and is also an ACM Distinguished Member. His foundational research on non-volatile memories, addressing read/write asymmetry and write calibration, has influenced commercial products including Intel 3D X-point memory. He has received numerous awards including the ACM Euro Award (2024), IEEE NVMSA Best Paper Award (2023), and ACM HotStorage Best Paper Award (2021).

Workshop Description

The fifth workshop on “Challenges and Opportunities of Efficient and Performant Storage Systems” (CHEOPS) is aimed at researchers, developers of scientific applications, engineers and everyone interested in the evolution of storage systems. As the developments of computing power, storage and network technologies continue to diverge, the bandwidth performance gap between them widens. This trend, combined with the ever-growing data volumes and data-driven computing such as machine learning, results in I/O and storage limitations, impacting the scalability and efficiency of current and future computing systems. Some of these challenges are quantitative, such as scale to match exascale system requirements, or latency reduction of the software stack to efficiently integrate new generations of hardware like storage class memory (SCM). Some other issues are more subtle and arise with the increased complexity of the storage solutions, like new smarter and more potent data management tools, monitoring systems or interoperability between I/O components or data formats.

The main objective of this workshop is to discuss state-of-the-art research, innovative ideas and experiences that focus on the design and implementation of storage systems in both academic and industrial worlds.

Important Dates

Submission Guidelines

In order to guarantee the quality of the submissions, we have formed a globally distributed, diverse program committee. All submissions will be reviewed by the program committee. We will use HotCRP to manage the submissions. The reviewing process will be double blind with at least 3 reviews for each submission. An online discussion will determine which papers to accept.

Only original and novel work not currently under review in other venues will be considered for publication. Submissions can either be full papers (6 pages) or short papers (4 pages). The page count includes the title, text, figures, appendices but excludes the references. They must be submitted electronically as PDF files formatted according to the submission rules of EuroSys. Accepted submissions will have to comply with the EuroSys proceedings format. One author of each accepted paper is required to register for the workshop and present the paper. Extended versions of selected papers will be considered for publication in the ACM SIGOPS Operating Systems Review journal.

Camera-Ready Format

You should use the acmart document class (https://www.acm.org/publications/proceedings-template, the same as for submission), as follows: \documentclass[sigplan,10pt]{acmart}

As mentioned above, you will receive the instruction regarding some LaTeX directives (\setcopyright, \acmConference, \acmDOI etc.) after completing the copyright form.

All accepted papers can use up to 2 additional pages for the camera-ready version, for a final limit of 8 (full papers) or 6 (short papers) pages, references not included.

Note that Type 1 fonts (scalable) should be used, not Type 3 (bitmapped), and that all fonts must be embedded. Type and embedding of fonts can be checked with various tools including pdffonts. Page numbers should be suppressed. Make also sure that the PDF is searchable by testing the search function in a PDF reader.

Information regarding the Rights forms and Uploading Final versions is coming soon.

Topics of Interest

Submissions may be more hands-on than research papers and we therefore explicitly encourage submissions in the early stages of research. Topics of interest include, but are not limited to:

WORK IN PROGRESS (WIP) SESSION

TBD

Organization

Steering Committee

General Chair

Program Chairs

Program Committee