Speaker
A. Ceseracciu
(SLAC / INFN PADOVA)
Description
The Event Reconstruction Control System of the BaBar experiment was redesigned in
2002, to satisfy the following major requirements: flexibility and scalability.
Because of its very nature, this system is continuously maintained to implement the
changing policies, typical of a complex, distributed production enviromnent.
In 2003, a major revolution in the BaBar computing model, the Computing Model 2,
brought a particularly vast set of new requirements in various respects, many of
which had to be discovered during the early production effort, and promptly dealt
with. Particularly, the reconstruction pipeline was expanded with the addition of a
third stage. The first fast calibration stage was kept running at SLAC, USA, while
the two stages doing most of the computation were moved to the ~400 CPU
reconstruction facility of INFN, Italy.
In this paper, we summarize the extent and nature of the evolution of the Control
System, and we demonstrate how the modular, well engineered architecture of the
system allowed to efficiently adapt and expand it, while making great reuse of
existing code, leaving virtually intact the core layer, and exploiting the
"engineering for flexibility" philosophy.
Authors
A. Ceseracciu
(SLAC / INFN PADOVA)
T. Pulliam
(Ohio State University)
