Event Logging and Distribution for the BaBar Online System

Technical Report · Thu Aug 29 04:00:00 EDT 2002

DOI:https://doi.org/10.2172/801767· OSTI ID:801767

Dasu, Sridhara ^[1]

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1. SLAC

We discuss the BABAR experiment software and computing infrastructure used for event logging and distribution to prompt reconstruction system. The raw data for typical BABAR events is about 30-50 kB per event. During the data taking a 100 Hz stream of events is collected from a farm of 32 online computers amounting to about 3-5 MB/s. A robust and efficient multi-threaded, TCP/IP based logging manager software was written to serve this purpose. Monitoring of the status of the program is achieved using CORBA. The same program is also used to distribute the logged events to a larger farm of 200 unix processors to process data promptly. This prompt processing involves full reconstruction and calibration programs before final storage in the Objectivity database. We describe the performance of underlying hardware and software, and address scalability of the program.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 801767
• Report Number(s): SLAC-PUB-8744
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
99 GENERAL AND MISCELLANEOUS
ACCELERATOR FACILITIES
CALIBRATION
COMPUTERS
DATA BASE MANAGEMENT
DATA PROCESSING
MONITORING
PERFORMANCE