Nov 4 – 8, 2019
Adelaide Convention Centre
Australia/Adelaide timezone

Distributed resources of the Czech WLCG Tier-2 center

Nov 7, 2019, 3:30 PM
Hall F (Adelaide Convention Centre)

Hall F

Adelaide Convention Centre

Poster Track 3 – Middleware and Distributed Computing Posters


Jiri Chudoba (Acad. of Sciences of the Czech Rep. (CZ))


The Computing Center of the Institute of Physics (CC FZU) of the Czech
Academy of Sciences provides compute and storage capacity to several
physics experiments. Most resources are used by two LHC experiments,
ALICE and ATLAS. In the WLCG, which coordinates computing activities for
the LHC experiments, the computing center is a Tier-2. The rest of
computing resources is used by astroparticle experiments Pierre
Auger Observatory (PAO) and Cherenkov Telescope Array (CTA) and
particle experiments like NOvA and DUNE.
Storage capacity is distributed to several locations. DPM servers used
by the ATLAS and the PAO are all in the same server room. ALICE uses
several xrootd servers located at the Nuclear Physics Institute in Rez,
about 10 km away. The storage capacity for the ATLAS and the PAO is
extended by resources of the CESNET (the Czech National Grid Initiative
representative) located in Ostrava, more than 100 km away from the CC
FZU. Storage is managed by a dCache instance, which is published in the CC
FZU BDII. ATLAS users can use these resources using the standard ATLAS
tools in the same way as the local storage without noticing this
geographical distribution.
The computing center provides about 8k CPU cores which are used by the
experiments based on fair-share. The CPUs are distributed amongst server
rooms in the Institute of Physics, in the Faculty of Mathematics and
Physics of the Charles University, and at CESNET. For the ATLAS
experiment, the resources are extended by opportunistic usage of the
Salomon HPC provided by the Czech national HPC center IT4Innovations in
Ostrava. The HPC provides 24-core nodes. The maximum number of allowed
single-node jobs in the batch system is 200. The contribution of the HPC
to the CPU consumption by the ATLAS experiment is about 15% on average.

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Primary authors

Jiri Chudoba (Acad. of Sciences of the Czech Rep. (CZ)) Michal Svatos (Acad. of Sciences of the Czech Rep. (CZ))


Martin Adam (Acad. of Sciences of the Czech Rep. (CZ)) Dagmar Adamova (Acad. of Sciences of the Czech Rep. (CZ)) Alexandr Mikula (Acad. of Sciences of the Czech Rep. (CZ)) Petr Vokac (Czech Technical University) Mrs Jana Uhlirova (FZU)

Presentation materials