9–13 Jul 2018
Sofia, Bulgaria
Europe/Sofia timezone

Performance and impact of dynamic data placement in ATLAS

11 Jul 2018, 12:00
15m
Hall 8 (National Palace of Culture)

Hall 8

National Palace of Culture

presentation Track 4 - Data Handling T4 - Data handling

Speaker

Thomas Maier (Ludwig Maximilians Universitat (DE))

Description

For high-throughput computing the efficient use of distributed computing resources relies on an evenly distributed workload, which in turn requires wide availability of input data that is used in physics analysis. In ATLAS, the dynamic data placement agent C3PO was implemented in the ATLAS distributed data management system Rucio which identifies popular data and creates additional, transient replicas to make data more widely and more reliably available.

This contribution presents studies on the performance of C3PO and the impact it has on throughput rates of distributed computing in ATLAS. This includes analysis of the placement algorithm selection behaviour regarding the data considered for replication and destination storage elements, usage after the placement decision of the chosen datasets in general and the newly created copies in particular, and the impact on metrics like job waiting times, task completion times and failure rates of tasks.

Primary authors

Thomas Maier (Ludwig Maximilians Universitat (DE)) Thomas Beermann (CERN) Ilija Vukotic (University of Chicago (US)) Federica Legger (Ludwig Maximilians Universitat (DE)) Mario Lassnig (CERN) Guenter Duckeck (Ludwig Maximilians Universitat (DE)) Mr Matteo Magoni (Politecnico di Torino)

Presentation materials