Abstract
The resources of the HPC centers are a potential aid to meet the future challenges of HL-LHC [1] in terms of computational requirements. Spanish HPC centers have recently been used to implement all necessary edge services to integrate resources into the LHC experiment workflow management system. In this article, we describe the integration of ATLAS with the extension plan to other LHC experiments. We chose to configure a dedicated ARC-CE [2] and interact with the HPC login and transfer nodes using ssh commands. The repository that includes a partial copy of the ATLAS experiment software on CVMFS is packaged in a singularity image to overcome network isolation for HPC nodes and reduce software requirements. ATLAS provided the initial container, and the authors adapted it to the specific HPC environment. This article shows the Spanish contribution to the simulation of experiments after the Spanish Ministry of Science agreement and the Barcelona Supercomputing Center (BSC), the center that operates MareNostrum 4. Finally, we discuss some challenges to take advantage of the next generation of HPC machines with heterogeneous architecture combining CPU and GPU.
Highlights
HPC resources help meet the future challenges of the High Luminosity LHC [1] (HL-LHC) period in terms of CPU requirements, which the budget for high energy physics programs cannot fully fund
We have shown that the Spanish WLCG centers providing ATLAS resources can integrate the national HPC centers into LHC computing workflows
This paper focuses on simulation tasks submitted using jobs from the ATLAS experiment in 2020
Summary
HPC resources help meet the future challenges of the High Luminosity LHC [1] (HL-LHC) period in terms of CPU requirements, which the budget for high energy physics programs cannot fully fund. The Spanish WLCG centers [3] are making an effort to integrate local HPC resources into the workflow management systems of the LHC experiments. In the case of this article, we show the results after BSC’s Marenostrum 4 HPC was integrated as a shared resource by the three WLCG centers that provide computing resources to ATLAS. These centers are located in Madrid (UAM), Valencia (IFIC), and Barcelona (PIC) [4]. Section shows the results in 2020 regarding resources consumed in Spain for the ATLAS experiment [5].
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