Bitmap Indices for Fast End-User Physics Analysis in ROOT

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Most physics analysis jobs involve multiple selection steps on the input data. These selection steps are called ''cuts'' or ''queries''. A common strategy to implement these queries is to read all input data from files and then process the queries in memory. In many applications the number of variables used to define these queries is a relative small portion of the overall data set therefore reading all variables into memory takes unnecessarily long time. In this paper we describe an integration effort that can significantly reduce this unnecessary reading by using an efficient compressed bitmap index technology. The primary advantage ... continued below

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Stockinger, Kurt; Wu, Kesheng; Brun, Rene & Canal, Philippe July 26, 2005.

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Most physics analysis jobs involve multiple selection steps on the input data. These selection steps are called ''cuts'' or ''queries''. A common strategy to implement these queries is to read all input data from files and then process the queries in memory. In many applications the number of variables used to define these queries is a relative small portion of the overall data set therefore reading all variables into memory takes unnecessarily long time. In this paper we describe an integration effort that can significantly reduce this unnecessary reading by using an efficient compressed bitmap index technology. The primary advantage of this index is that it can process arbitrary combinations of queries very efficiently, while most other indexing technologies suffer from the ''curse of dimensionality'' as the number of queries increases. By integrating this index technology with the ROOT analysis framework, the end-users can benefit from the added efficiency without having to modify their analysis programs. Our performance results show that for multi-dimensional queries, bitmap indices outperform the traditional analysis method up to a factor of 10.

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  • Journal Name: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment; Journal Volume: 559; Journal Issue: 1; Related Information: Journal Publication Date: 04/01/2006

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  • Report No.: LBNL--58426
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 891814
  • Archival Resource Key: ark:/67531/metadc884115

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Office of Scientific & Technical Information Technical Reports

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 26, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 22, 2017, 3:07 p.m.

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Stockinger, Kurt; Wu, Kesheng; Brun, Rene & Canal, Philippe. Bitmap Indices for Fast End-User Physics Analysis in ROOT, article, July 26, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc884115/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.