Using ssh as portal – The CMS CRAB over glideinWMS experience

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...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-06, Vol.513 (3), p.32006-7
Main Authors: Belforte, S, Sfiligoi, I, Letts, J, Fanzago, F, Santos, M D Saiz, Martin, T
Format: Article
Language:English
Subjects:
Architecture (computers)
Construction
Crabs
Packages
Physics
Running
Servers
Simplification
Switches
User satisfaction
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Summary: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/513/3/032006