EPJ Web of Conferences最新文献

Heavy flavor and quarkonia results from the PHENIX experiment PHENIX实验的重味和夸克态结果

EPJ Web of Conferences Pub Date : 2024-07-02 DOI: 10.1051/epjconf/202429609016

Krista Smith

引用次数: 1

The ups and downs of inferred cosmological lithium 推断宇宙学锂的起伏

EPJ Web of Conferences Pub Date : 2024-06-14 DOI: 10.1051/epjconf/202429701007

Andreas Korn

引用次数: 0

Adoption of a token-based authentication model for the CMS Submission Infrastructure 为内容管理系统提交基础设施采用基于令牌的身份验证模式

EPJ Web of Conferences Pub Date : 2024-05-23 DOI: 10.1051/epjconf/202429504003

A. P. Yzquierdo, M. Mascheroni, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem, Frank Wurthwein

{"title":"Adoption of a token-based authentication model for the CMS Submission Infrastructure","authors":"A. P. Yzquierdo, M. Mascheroni, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem, Frank Wurthwein","doi":"10.1051/epjconf/202429504003","DOIUrl":"https://doi.org/10.1051/epjconf/202429504003","url":null,"abstract":"The CMS Submission Infrastructure (SI) is the main computing resource provisioning system for CMS workloads. A number of HTCondor pools are employed to manage this infrastructure, which aggregates geographically distributed resources from the WLCG and other providers. Historically, the model of authentication among the diverse components of this infrastructure has relied on the Grid Security Infrastructure (GSI), based on identities and X509 certificates. In contrast, commonly used modern authentication standards are based on capabilities and tokens. The WLCG has identified this trend and aims at a transparent replacement of GSI for all its workload management, data transfer and storage access operations, to be completed during the current LHC Run 3. As part of this effort, and within the context of CMS computing, the Submission Infrastructure group is in the process of phasing out the GSI part of its authentication layers, in favor of IDTokens and Scitokens. The use of tokens is already well integrated into the HTCondor Software Suite, which has allowed us to fully migrate the authentication between internal components of SI. Additionally, recent versions of the HTCondor-CE support tokens as well, enabling CMS resource requests to Grid sites employing this CE technology to be granted by means of token exchange. After a rollout campaign to sites, successfully completed by the third quarter of 2022, the totality of HTCondor CEs in use by CMS are already receiving Scitoken-based pilot jobs. On the ARC CE side, a parallel campaign was launched to foster the adoption of the REST interface at CMS sites (required to enable token-based job submission via HTCondor-G), which is nearing completion as well. In this contribution, the newly adopted authentication model will be described. We will then report on the migration status and final steps towards complete GSI phase out in the CMS SI.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141106376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The integration of heterogeneous resources in the CMS Submission Infrastructure for the LHC Run 3 and beyond 大型强子对撞机运行 3 及以后的 CMS 提交基础设施中的异构资源整合

EPJ Web of Conferences Pub Date : 2024-05-23 DOI: 10.1051/epjconf/202429504046

A. P. Yzquierdo, M. Mascheroni, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem

{"title":"The integration of heterogeneous resources in the CMS Submission Infrastructure for the LHC Run 3 and beyond","authors":"A. P. Yzquierdo, M. Mascheroni, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem","doi":"10.1051/epjconf/202429504046","DOIUrl":"https://doi.org/10.1051/epjconf/202429504046","url":null,"abstract":"While the computing landscape supporting LHC experiments is currently dominated by x86 processors at WLCG sites, this configuration will evolve in the coming years. LHC collaborations will be increasingly employing HPC and Cloud facilities to process the vast amounts of data expected during the LHC Run 3 and the future HL-LHC phase. These facilities often feature diverse compute resources, including alternative CPU architectures like ARM and IBM Power, as well as a variety of GPU specifications. Using these heterogeneous resources efficiently is thus essential for the LHC collaborations reaching their future scientific goals. The Submission Infrastructure (SI) is a central element in CMS Computing, enabling resource acquisition and exploitation by CMS data processing, simulation and analysis tasks. The SI must therefore be adapted to ensure access and optimal utilization of this heterogeneous compute capacity. Some steps in this evolution have been already taken, as CMS is currently using opportunistically a small pool of GPU slots provided mainly at the CMS WLCG sites. Additionally, Power9 processors have been validated for CMS production at the Marconi-100 cluster at CINECA. This note will describe the updated capabilities of the SI to continue ensuring the efficient allocation and use of computing resources by CMS, despite their increasing diversity. The next steps towards a full integration and support of heterogeneous resources according to CMS needs will also be reported.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"7 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141107025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Repurposing of the Run 2 CMS High Level Trigger Infrastructure as a Cloud Resource for Offline Computing 将 Run 2 CMS 高级触发器基础设施重新用作离线计算的云资源

EPJ Web of Conferences Pub Date : 2024-05-23 DOI: 10.1051/epjconf/202429503036

M. Mascheroni, A. P. Yzquierdo, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem, D. Spiga, C. Wissing, Frank Wurthwein

{"title":"Repurposing of the Run 2 CMS High Level Trigger Infrastructure as a Cloud Resource for Offline Computing","authors":"M. Mascheroni, A. P. Yzquierdo, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem, D. Spiga, C. Wissing, Frank Wurthwein","doi":"10.1051/epjconf/202429503036","DOIUrl":"https://doi.org/10.1051/epjconf/202429503036","url":null,"abstract":"The former CMS Run 2 High Level Trigger (HLT) farm is one of the largest contributors to CMS compute resources, providing about 25k job slots for offline computing. This CPU farm was initially employed as an opportunistic resource, exploited during inter-fill periods, in the LHC Run 2. Since then, it has become a nearly transparent extension of the CMS capacity at CERN, being located on-site at the LHC interaction point 5 (P5), where the CMS detector is installed. This resource has been configured to support the execution of critical CMS tasks, such as prompt detector data reconstruction. It can therefore be used in combination with the dedicated Tier 0 capacity at CERN, in order to process and absorb peaks in the stream of data coming from the CMS detector. The initial configuration for this resource, based on statically configured VMs, provided the required level of functionality. However, regular operations of this cluster revealed certain limitations compared to the resource provisioning and use model employed in the case of WLCG sites. A new configuration, based on a vacuum-like model, has been implemented for this resource in order to solve the detected shortcomings. This paper reports about this redeployment work on the permanent cloud for an enhanced support to CMS offline computing, comparing the former and new models’ respective functionalities, along with the commissioning effort for the new setup.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"51 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141103068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

HPC resources for CMS offline computing: An integration and scalability challenge for the Submission Infrastructure 用于内容管理系统离线计算的高性能计算资源：提交基础设施面临的集成和可扩展性挑战

EPJ Web of Conferences Pub Date : 2024-05-23 DOI: 10.1051/epjconf/202429501035

A. P. Yzquierdo, M. Mascheroni, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem

{"title":"HPC resources for CMS offline computing: An integration and scalability challenge for the Submission Infrastructure","authors":"A. P. Yzquierdo, M. Mascheroni, Edita Kizinevič, F. Khan, Hyunwoo Kim, M. A. Flechas, Nikos Tsipinakis, Saqib Haleem","doi":"10.1051/epjconf/202429501035","DOIUrl":"https://doi.org/10.1051/epjconf/202429501035","url":null,"abstract":"The computing resource needs of LHC experiments are expected to continue growing significantly during the Run 3 and into the HL-LHC era. The landscape of available resources will also evolve, as High Performance Computing (HPC) and Cloud resources will provide a comparable, or even dominant, fraction of the total compute capacity. The future years present a challenge for the experiments’ resource provisioning models, both in terms of scalability and increasing complexity. The CMS Submission Infrastructure (SI) provisions computing resources for CMS workflows. This infrastructure is built on a set of federated HTCondor pools, currently aggregating 400k CPU cores distributed worldwide and supporting the simultaneous execution of over 200k computing tasks. Incorporating HPC resources into CMS computing represents firstly an integration challenge, as HPC centers are much more diverse compared to Grid sites. Secondly, evolving the present SI, dimensioned to harness the current CMS computing capacity, to reach the resource scales required for the HLLHC phase, while maintaining global flexibility and efficiency, will represent an additional challenge for the SI. To preventively address future potential scalability limits, the SI team regularly runs tests to explore the maximum reach of our infrastructure. In this note, the integration of HPC resources into CMS offline computing is summarized, the potential concerns for the SI derived from the increased scale of operations are described, and the most recent results of scalability test on the CMS SI are reported.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"38 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141103790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Parallelizing Air Shower Simulation for Background Characterization in IceCube 为冰立方背景特征描述进行并行气流喷淋模拟

EPJ Web of Conferences Pub Date : 2024-05-09 DOI: 10.1051/epjconf/202429511016

K. Meagher, J. Santen

{"title":"Parallelizing Air Shower Simulation for Background Characterization in IceCube","authors":"K. Meagher, J. Santen","doi":"10.1051/epjconf/202429511016","DOIUrl":"https://doi.org/10.1051/epjconf/202429511016","url":null,"abstract":"The IceCube Neutrino Observatory is a cubic kilometer neutrino telescope located at the Geographic South Pole. For every observed neutrino event, there are over 106 background events caused by cosmic ray air shower muons. In order to properly separate signal from background, it is necessary to produce Monte Carlo simulations of these air showers. Although to-date, IceCube has produced large quantities of background simulation, these studies still remain statistics limited. The first stage of simulation requires heavy CPU usage while the second stage requires heavy GPU usage. Processing both of these stages on the same node will result in an underutilized GPU but using different nodes will encounter bandwidth bottlenecks. Furthermore, due to the power-law energy spectrum of cosmic rays, the memory footprint of the detector response often exceeded the limit in unpredictable ways. This proceeding presents new client–server code which parallelizes the first stage onto multiple CPUs on the same node and then passes it on to the GPU for photon propagation. This results in GPU utilization of greater than 90% as well as more predictable memory usage and an overall factor of 20 improvement in speed over previous techniques.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":" 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140996424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formal theory of heavy ion double charge exchange reactions 重离子双电荷交换反应的形式理论

EPJ Web of Conferences Pub Date : 2024-05-08 DOI: 10.1051/epjconf/202429204001

H. Lenske, J. Bellone, M. Colonna, Danilo Gambacurta, José-Antonio Lay

引用次数: 1

Generating galaxy clusters mass density maps from mock multiview images via deep learning 通过深度学习从模拟多视角图像生成星系团质量密度图

EPJ Web of Conferences Pub Date : 2024-04-08 DOI: 10.1051/epjconf/202429300013

Daniel de Andres, W. Cui, G. Yepes, M. Petris, G. Aversano, A. Ferragamo, Federico De Luca, A. J. Munoz

引用次数: 0

Improved Constraints on Mergers with SZ, Hydrodynamical simulations, Optical, and X-ray (ICM-SHOX) 利用 SZ、流体力学模拟、光学和 X 射线（ICM-SHOX）改进对合并的约束

EPJ Web of Conferences Pub Date : 2024-04-05 DOI: 10.1051/epjconf/202429300050

E. M. Silich, E. Bellomi, J. Sayers, J. Zuhone, U. Chadayammuri, S. Golwala, D. Hughes, A. Montaña, T. Mroczkowski, D. Nagai, D. Sánchez, S. Stanford, G. Wilson, M. Zemcov, A. Zitrin

{"title":"Improved Constraints on Mergers with SZ, Hydrodynamical simulations, Optical, and X-ray (ICM-SHOX)","authors":"E. M. Silich, E. Bellomi, J. Sayers, J. Zuhone, U. Chadayammuri, S. Golwala, D. Hughes, A. Montaña, T. Mroczkowski, D. Nagai, D. Sánchez, S. Stanford, G. Wilson, M. Zemcov, A. Zitrin","doi":"10.1051/epjconf/202429300050","DOIUrl":"https://doi.org/10.1051/epjconf/202429300050","url":null,"abstract":"Galaxy cluster mergers are representative of a wide range of physics, making them an excellent probe of the properties of dark matter and the ionized plasma of the intracluster medium. To date, most studies have focused on mergers occurring in the plane of the sky, where morphological features can be readily identified. To allow study of mergers with arbitrary orientation, we have assembled multi-probe data for the eight-cluster ICM-SHOX sample sensitive to both morphology and line of sight velocity. The first ICM-SHOX paper [1] provided an overview of our methodology applied to one member of the sample, MACS J0018.5+1626, in order to constrain its merger geometry. That work resulted in an exciting new discovery of a velocity space decoupling of its gas and dark matter distributions. In this work, we describe the availability and quality of multi-probe data for the full ICM-SHOX galaxy cluster sample. These datasets will form the observational basis of an upcoming full ICM-SHOX galaxy cluster sample analysis.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"12 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140738705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0