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ATLAS utilisation of the Czech national HPC center

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    0522442 - FZÚ 2020 RIV FR eng C - Conference Paper (international conference)
    Svatoš, Michal - Chudoba, Jiří - Vokáč, P.
    ATLAS utilisation of the Czech national HPC center.
    EPJ Web of Conferences. Vol. 214. les Ulis: EDP Sciences, 2019 - (Forti, A.; Betev, L.; Litmaath, M.; Smirnova, O.; Hristov, P.), s. 1-8, č. článku 03005. ISSN 2100-014X.
    [International Conference on Computing in High Energy and Nuclear Physics (CHEP 2018) /23./. Sofia (BG), 09.07.2018-13.07.2018]
    R&D Projects: GA MŠMT LM2015058; GA MŠMT EF16_013/0001404
    Grant - others:OP VVV - CERN-C(XE) CZ.02.1.01/0.0/0.0/16_013/0001404
    Institutional support: RVO:68378271
    Keywords : ARC * ATLAS * control tower * CVMFS installation
    OECD category: Automation and control systems

    The Czech national HPC center IT4Innovations located in Ostrava provides two HPC systems, Anselm and Salomon. The Salomon HPC is amongst the hundred most powerful supercomputers on Earth since its commissioning in 2015. Multiple strategies for ATLAS job execution were tested on the Salomon and Anselm HPCs. The solution described herein is based on the ATLAS experience with other HPC sites. ARC Compute Element (ARC-CE) installed at the grid site in Prague is used for job submission to Salomon. The ATLAS production system submits jobs to the ARC-E via ARC Control Tower (aCT). The ARC-CE processes job requirements from aCT and creates a script for a batch system which is then executed via ssh. Sshfs is used to share scripts and input files between the site and the HPC cluster. The software used to run jobs is rsynced from the site's CVMFS installation to the HPC's scratch space every day to ensure availability of recent software.

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