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arXiv 1611.03215physics.ins-detcs.DChep-ex
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LHC运行2的CMS软件和计算

CMS software and computing for LHC Run 2

Kenneth Bloom

摘要:

CMS离线软件和计算系统成功地应对了LHC运行2的挑战。在本演示文稿中,我们将讨论如何在预期增加触发输出率,增加堆积相互作用的速率和计算技术的演变,整个系统得到改进。这些变化背后的主要目标是尽可能提高计算设施的灵活性,以提高我们的运营效率,并减少完成主要离线计算工作流所需的计算资源。这些变化为运行2和未来的CMS带来了一种新的分布式计算方法,因为LHC的亮度应该会继续增加。我们将讨论对数据联合的更改和计划,这是为运行2提供更灵活的计算模型的关键更改之一。我们的软件框架和算法也发生了重大变化。我们将总结我们在2015年快速重建农场和CMS WLCG一级设施中部署的新多线程框架的经验。我们将讨论我们的经验与分析数据格式,这是十倍小于我们的主要运行1格式。这种“miniAOD”格式已被证明更容易分析,同时对分析师来说非常灵活。最后,我们描述了我们的工作流程管理系统的改进,提高了自动化和可靠性的CMS生产和用户分析操作的各个方面。

英文摘要:

The CMS offline software and computing system has successfully met the challenge of LHC Run 2. In this presentation, we will discuss how the entire system was improved in anticipation of increased trigger output rate, increased rate of pileup interactions and the evolution of computing technology. The primary goals behind these changes was to increase the flexibility of computing facilities where ever possible, as to increase our operational efficiency, and to decrease the computing resources needed to accomplish the primary offline computing workflows. These changes have resulted in a new approach to distributed computing in CMS for Run 2 and for the future as the LHC luminosity should continue to increase. We will discuss changes and plans to our data federation, which was one of the key changes towards a more flexible computing model for Run 2. Our software framework and algorithms also underwent significant changes. We will summarize the our experience with a new multi-threaded framework as deployed on our prompt reconstruction farm for 2015 and across the CMS WLCG Tier-1 facilities. We will discuss our experience with a analysis data format which is ten times smaller than our primary Run 1 format. This "miniAOD" format has proven to be easier to analyze while be extremely flexible for analysts. Finally, we describe improvements to our workflow management system that have resulted in increased automation and reliability for all facets of CMS production and user analysis operations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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