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Title: Event Logging and Distribution for the BaBar Online System

Abstract

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.

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
801767
Report Number(s):
SLAC-PUB-8744
TRN: US0204711
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 29 Aug 2002
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; 43 PARTICLE ACCELERATORS; CALIBRATION; COMPUTERS; MONITORING; PERFORMANCE; DATA BASE MANAGEMENT; ACCELERATOR FACILITIES; DATA PROCESSING

Citation Formats

Dasu, Sridhara. Event Logging and Distribution for the BaBar Online System. United States: N. p., 2002. Web. doi:10.2172/801767.
Dasu, Sridhara. Event Logging and Distribution for the BaBar Online System. United States. doi:10.2172/801767.
Dasu, Sridhara. Thu . "Event Logging and Distribution for the BaBar Online System". United States. doi:10.2172/801767. https://www.osti.gov/servlets/purl/801767.
@article{osti_801767,
title = {Event Logging and Distribution for the BaBar Online System},
author = {Dasu, Sridhara},
abstractNote = {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.},
doi = {10.2172/801767},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {8}
}

Technical Report:

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