EPJ Web Conf.
Volume 245, 202024th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2019)
|Number of page(s)||7|
|Section||9 - Exascale Science|
|Published online||16 November 2020|
Improvements in utilisation of the Czech national HPC center
Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, Prague, 18221, Czech Republic
2 Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Bˇrehová 7, Prague, 115 19, Czech Republic
Published online: 16 November 2020
The distributed computing system of the ATLAS experiment at LHC is allowed to opportunistically use resources at the Czech national HPC center IT4Innovations in Ostrava. The jobs are submitted via an ARC Compute Element (ARC-CE) installed at the grid site in Prague. Scripts and input files are shared between the ARC-CE and a shared file system located at the HPC centre via sshfs. This basic submission system has worked there since the end of 2017. Several improvements were made to increase the amount of resource that ATLAS can use. The most significant change was the migration of the submission system to enable pre-emptable jobs, to adapt to the HPC management’s decision to start pre-empting opportunistic jobs. Another improvement of the submission system was related to the sshfs connection which seemed to be a limiting factor of the system. Now, the submission system consists of several ARC-CE machines. Also, various parameters of sshfs were tested in an attempt to increase throughput. As a result of the improvements, the utilisation of the Czech national HPC center by the ATLAS distributed computing increased.
© The Authors, published by EDP Sciences, 2020
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