Speaker
Daniele Spiga
(Universita degli Studi di Perugia)
Description
Starting from 2007 the CMS experiment will produce several Pbytes of data each
year, to be distributed over many computing centers located in many different
countries. The CMS computing model defines how the data are to be distributed such
that CMS physicists can access them in an efficient manner in order to
perform their physics analyses. CRAB (CMS Remote Analysis Builder) is a specific
tool, designed and developed
by the CMS collaboration, that facilitates access to the distributed data in a
very transparent way. The tool's main feature is the possibility of distributing and
parallelizing the local CMS batch data analysis processes over
different Grid environments without any specific knowledge of the underlying
computational infrastructures. More specifically CRAB allows the transparent
usage of WLCG, gLite and OSG middleware. CRAB interacts with both the local
user environment, with CMS Data Management services and with the Grid middleware.
CRAB has been in production and in routine use by end-users since Spring 2004.
It has been extensively used during studies to prepare the Physics Technical
Design Report (PTDR) and in the analysis of reconstructed event samples
generated during the Computing Software and Analysis Challenge (CSA06).
This involved generating thousands of jobs per day at peak rates. In this work
we discuss the current implementation of CRAB, experience with using it in
production and plans for improvements in the immediate future.
| Submitted on behalf of Collaboration (ex, BaBar, ATLAS) | CMS Offline Computing |
|---|
Author
Daniele Spiga
(Universita degli Studi di Perugia)
