Using ssh as portal _ The CMS CRAB over glideinWMS experience

20th International Conference on Computing in High Energy and Nuclear Physics

物理学;计算机科学

Belforte, S.^1 ; Sfiligoi, I.^2 ; Letts, J.^2 ; Fanzago, F.^3 ; Santos, M. D. Saiz^2 ; Martin, T.^2

INFN Sezione di Trieste, Via Valerio 2, Trieste

34127, Italy^1

University of California San Diego, 9500 Gilman Dr, San Diego

CA

92093, United States^2

INFN Sezione di Padova, Via Marzolo 8, Padova

35131, Italy^3

关键词: Abstraction layer;    Batch systems;    Client server;    Operation support;    Operational experience;    Remote analysis;    User analysis;    User satisfaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/513/3/032006/pdf
DOI  :  10.1088/1742-6596/513/3/032006

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The User Analysis of the CMS experiment is performed in distributed way using both Grid and dedicated resources. In order to insulate the users from the details of computing fabric, CMS relies on the CRAB (CMS Remote Analysis Builder) package as an abstraction layer. CMS has recently switched from a client-server version of CRAB to a purely client-based solution, with ssh being used to interface with HTCondor-based glideinWMS batch system. This switch has resulted in significant improvement of user satisfaction, as well as in significant simplification of the CRAB code base and of the operation support. This paper presents the architecture of the ssh-based CRAB package, the rationale behind it, as well as the operational experience running both the client-server and the ssh-based versions in parallel for several months.