Darshan for HEP applications

Conference · 01 January 2024 · EPJ Web Conf.

DOI:https://doi.org/10.1051/epjconf/202429505003· OSTI ID:2468766

Wang, Rui ^[1]; Snyder, Shane ^[1]; Benjamin, Douglas ^[2]; Dong, Zhihua ^[2]; Gartung, Patrick ^[3]; Herner, Kenneth ^[3]

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1. Argonne
2. Brookhaven
3. Fermilab

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 filtering stage, and the CMS simulation workflow using Darshan is presented, including insights into the I/O operations and data access size.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2468766
• Report Number(s): FERMILAB-CONF-24-0691-CSAID; oai:inspirehep.net:2785516
• Conference Information: Journal Name: EPJ Web Conf. Journal Volume: 295
• Country of Publication: United States
• Language: English