Abstract
The ATLAS Spanish Tier-1 and Tier-2s have more than 15 years of experience in the deployment and development of LHC computing components and their successful operations. The sites are already actively participating in, and even coordinating, emerging R&D computing activities and developing new computing models needed for the Run3 and HighLuminosity LHC periods. In this contribution, we present details on the integration of new components, such as High Performance Computing resources to execute ATLAS simulation workflows. The development of new techniques to improve efficiency in a cost-effective way, such as storage and CPU federations is shown in this document. Improvements in data organization, management and access through storage consolidations (“data-lakes”), the use of data caches, and improving experiment data catalogs, like Event Index, are explained in this proceeding. The design and deployment of new analysis facilities using GPUs together with CPUs and techniques like Machine Learning will also be presented. Tier-1 and Tier-2 sites, are, and will be, contributing to significant R&D in computing, evaluating different models for improving performance of computing and data storage capacity in the High-Luminosity LHC era.
Highlights
In the original computing model of the ATLAS experiment [1] at the LHC at CERN, Tier1 centers had associated Tier-2 centers, which were close-by in terms of network connectivity, and they formed a cloud, which in ATLAS means a regional setup of one Tier1 and its Tier-2s in a certain geographical area
ES-ATLAS-T2 represents 4% of the total Tier-2s resources and together with the Tier-1, they are integrated in the World Wide LHC Computing GRID (WLCG) project [4] and strictly follow the ATLAS computing model
The Spanish sites are actively participating in, and even coordinating, emerging R&D computing activities aimed at developing the new computing models needed for the LHC Run3 and HL-LHC periods
Summary
The Spanish cloud (ES) [3] inside ATLAS has one Tier-1 at PIC in Barcelona providing 4% of Tier-1s data processing of CERN’s LHC detectors ATLAS, CMS and LHCb. The Spanish cloud (ES) [3] inside ATLAS has one Tier-1 at PIC in Barcelona providing 4% of Tier-1s data processing of CERN’s LHC detectors ATLAS, CMS and LHCb It consists of one federated Spanish Tier-2 (ES-ATLAS-T2) at IFIC in Valencia, at IFAE (colocated in PIC) in Barcelona, and at UAM in Madrid with 50%, 25% and 25% of the resources respectively, and one Tier-2 in Lisbon, Portugal. ES-ATLAS-T2 represents 4% of the total Tier-2s resources and together with the Tier-1, they are integrated in the World Wide LHC Computing GRID (WLCG) project [4] and strictly follow the ATLAS computing model. The ES is at the top of availability and reliability ranks
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