Abstract
Since the beginning of the WLCG Project the Spanish ATLAS computing centers have participated with reliable and stable resources as well as personnel for the ATLAS Collaboration. Our contribution to the ATLAS Tier2s and Tier1s computing resources (disk and CPUs) in the last 10 years has been around 4-5%. In 2016 an international advisory committee recommended to revise our contribution according to the participation in the ATLAS experiment. With this scenario, we are optimizing the federation of three sites located in Barcelona, Madrid and Valencia, considering that the ATLAS collaboration has developed workflows and tools to flexibly use all the resources available to the collaboration, where the tiered structure is somehow vanishing. In this contribution, we would like to show the evolution and technical updates in the ATLAS Spanish Federated Tier2 and Tier1. Some developments we are involved in, like the Event Index project, as well as the use of opportunistic resources will be useful to reach our goal. We discuss the foreseen/proposed scenario towards a sustainable computing environment for the Spanish ATLAS community in the HL-LHC period.
Highlights
ATLAS Computing Challenges at HL-LHC periodIn the High Luminosity LHC period (HL-LHC) the ATLAS computing demands far outstrip the budget dedicated to computing by the different countries
Since the beginning of the WLCG Project the Spanish ATLAS computing centers have participated with reliable and stable resources as well as personnel for the ATLAS Collaboration
In the High Luminosity LHC period (HL-LHC) the ATLAS computing demands far outstrip the budget dedicated to computing by the different countries
Summary
In the High Luminosity LHC period (HL-LHC) the ATLAS computing demands far outstrip the budget dedicated to computing by the different countries. Assuming a flat budget for the facilities, a 20%/yr capacity growth, and a constant development effort, a ~3x shortfall of CPU resources with respect to the flat budget model is estimated for the HL-LHC (Run 4), see Figure 1. In this case, the potential use of coprocessor/GPUs has not been considered. The community has provided the hardware resources fulfilling the ATLAS requirements of the Resource Review Board of the LHCC committee, contributing around 4% of the total resources of all ATLAS Tier-2s and 5% of all Tier-1s These resources are integrated in the WLCG project and follow the ATLAS Computing Model.
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