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May 8 – 12, 2023
Norfolk Waterside Marriott
US/Eastern timezone

Darshan for HEP application

May 11, 2023, 12:30 PM
Chesapeake Meeting Room (Norfolk Waterside Marriott)

Chesapeake Meeting Room

Norfolk Waterside Marriott

235 East Main Street Norfolk, VA 23510
Oral Track 5 - Sustainable and Collaborative Software Engineering Track 5 - Sustainable and Collaborative Software Engineering


Wang, Rui (Argonne national laboratory)


Modern HEP workflows must manage increasingly large and complex data collections. HPC facilities may be employed to help meet these workflows' growing data processing needs. However, a better understanding of the I/O patterns and underlying bottlenecks of these workflows is necessary to meet the performance expectations of HPC systems.
Darshan is a lightweight I/O characterization tool that captures concise views of HPC application I/O behavior. It intercepts application I/O calls at runtime, records file access statistics for each process, and generates log files detailing application I/O access patterns.
Typical HEP workflows include event generation, detector simulation, event reconstruction, and subsequent analysis stages. A study of the I/O behavior of the ATLAS simulation and DAOD_PHY/DAOD_PHYSLITE production, CMS simulation, and DUNE analysis workload using Darshan are presented. Characterization of the various stages at scale would guide the further tuning of the I/O patterns with real HEP workloads to better inform storage capabilities requirements at facilities, uncover the I/O bottlenecks in current workflows when deployed at scale, and provide recommendations for data format and access patterns for future HEP workloads.

Consider for long presentation No

Primary authors

Wang, Rui (Argonne national laboratory) Benjamin, Douglas (Brookhaven National Laboratory) Gartung, Patrick (Fermilab) Herner, Kenneth (Fermi National Accelerator Laboratory) Snyder, Shane (Argonne national laboratory)

Presentation materials