On Worst Case Robin-Hood Hashing

Devroye, Luc - Morin, Pat - Viola, Alfredo

Resumen:

We consider open addressing hashing, and implement it by using the Robin Hood strategy, that is, in case of collision, the element that has traveled the furthest can stay in the slot. We hash elements into a table of size n where each probe is independent and uniformly distributed over the table, and [ 1 is a constant. Let Mn be the maximum search time for any of the elements in the table. We show that with probability tending to one, Mn E [kig2 logn + s, log2 logn + T] for some constants s, T depending upon alfa only. Tis is an exponential improvement over the maximum search time in case of the standard FCFS (first come first served) collision strategy, and virtually matches the performance of multiple choice hash methods.


Detalles Bibliográficos
2002
OPEN ADRESSING
HASHING
ROBIN HOOD
WORST-CASE SEARCH TIME
COLLISION RESOLUTION
PROBABILISTIC ANALYSIS OF ALGORITHMS
Universidad de la República
COLIBRI
http://hdl.handle.net/20.500.12008/3481
Acceso abierto
Licencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC BY-NC-ND 4.0)
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author Devroye, Luc
author2 Morin, Pat
Viola, Alfredo
author2_role author
author
author_facet Devroye, Luc
Morin, Pat
Viola, Alfredo
author_role author
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dc.creator.none.fl_str_mv Devroye, Luc
Morin, Pat
Viola, Alfredo
dc.date.accessioned.none.fl_str_mv 2014-12-02T16:06:42Z
dc.date.available.none.fl_str_mv 2014-12-02T16:06:42Z
dc.date.issued.es.fl_str_mv 2002
dc.date.submitted.es.fl_str_mv 20141202
dc.description.abstract.none.fl_txt_mv We consider open addressing hashing, and implement it by using the Robin Hood strategy, that is, in case of collision, the element that has traveled the furthest can stay in the slot. We hash elements into a table of size n where each probe is independent and uniformly distributed over the table, and [ 1 is a constant. Let Mn be the maximum search time for any of the elements in the table. We show that with probability tending to one, Mn E [kig2 logn + s, log2 logn + T] for some constants s, T depending upon alfa only. Tis is an exponential improvement over the maximum search time in case of the standard FCFS (first come first served) collision strategy, and virtually matches the performance of multiple choice hash methods.
dc.format.extent.es.fl_str_mv 18 p.
dc.format.mimetype.es.fl_str_mv application/pdf
dc.identifier.citation.es.fl_str_mv DEVROYE, L., MORIN, P., VIOLA, A. "On Worst Case Robin-Hood Hashing". Reportes Técnicos 02-12. UR. FI – INCO, 2002.
dc.identifier.issn.es.fl_str_mv 0797-6410
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/20.500.12008/3481
dc.language.iso.none.fl_str_mv in
dc.publisher.es.fl_str_mv UR. FI – INCO.
dc.relation.ispartof.es.fl_str_mv Reportes Técnicos 02-12
dc.rights.license.none.fl_str_mv Licencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC BY-NC-ND 4.0)
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
dc.source.none.fl_str_mv reponame:COLIBRI
instname:Universidad de la República
instacron:Universidad de la República
dc.subject.es.fl_str_mv OPEN ADRESSING
HASHING
ROBIN HOOD
WORST-CASE SEARCH TIME
COLLISION RESOLUTION
PROBABILISTIC ANALYSIS OF ALGORITHMS
dc.title.none.fl_str_mv On Worst Case Robin-Hood Hashing
dc.type.es.fl_str_mv Reporte técnico
dc.type.none.fl_str_mv info:eu-repo/semantics/report
dc.type.version.none.fl_str_mv info:eu-repo/semantics/publishedVersion
description We consider open addressing hashing, and implement it by using the Robin Hood strategy, that is, in case of collision, the element that has traveled the furthest can stay in the slot. We hash elements into a table of size n where each probe is independent and uniformly distributed over the table, and [ 1 is a constant. Let Mn be the maximum search time for any of the elements in the table. We show that with probability tending to one, Mn E [kig2 logn + s, log2 logn + T] for some constants s, T depending upon alfa only. Tis is an exponential improvement over the maximum search time in case of the standard FCFS (first come first served) collision strategy, and virtually matches the performance of multiple choice hash methods.
eu_rights_str_mv openAccess
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identifier_str_mv DEVROYE, L., MORIN, P., VIOLA, A. "On Worst Case Robin-Hood Hashing". Reportes Técnicos 02-12. UR. FI – INCO, 2002.
0797-6410
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publishDate 2002
reponame_str COLIBRI
repository.mail.fl_str_mv mabel.seroubian@seciu.edu.uy
repository.name.fl_str_mv COLIBRI - Universidad de la República
repository_id_str 4771
rights_invalid_str_mv Licencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC BY-NC-ND 4.0)
spelling 2014-12-02T16:06:42Z2014-12-02T16:06:42Z200220141202DEVROYE, L., MORIN, P., VIOLA, A. "On Worst Case Robin-Hood Hashing". Reportes Técnicos 02-12. UR. FI – INCO, 2002.0797-6410http://hdl.handle.net/20.500.12008/3481We consider open addressing hashing, and implement it by using the Robin Hood strategy, that is, in case of collision, the element that has traveled the furthest can stay in the slot. We hash elements into a table of size n where each probe is independent and uniformly distributed over the table, and [ 1 is a constant. Let Mn be the maximum search time for any of the elements in the table. We show that with probability tending to one, Mn E [kig2 logn + s, log2 logn + T] for some constants s, T depending upon alfa only. Tis is an exponential improvement over the maximum search time in case of the standard FCFS (first come first served) collision strategy, and virtually matches the performance of multiple choice hash methods.Made available in DSpace on 2014-12-02T16:06:42Z (GMT). No. of bitstreams: 5 TR0212.pdf: 172725 bytes, checksum: f3d7c5b17f897a4733a9f6126b3f17e0 (MD5) license_text: 21936 bytes, checksum: 9833653f73f7853880c94a6fead477b1 (MD5) license_url: 49 bytes, checksum: 4afdbb8c545fd630ea7db775da747b2f (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) license.txt: 4244 bytes, checksum: 528b6a3c8c7d0c6e28129d576e989607 (MD5) Previous issue date: 200218 p.application/pdfinUR. FI – INCO.Reportes Técnicos 02-12Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad De La República. (Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC BY-NC-ND 4.0)OPEN ADRESSINGHASHINGROBIN HOODWORST-CASE SEARCH TIMECOLLISION RESOLUTIONPROBABILISTIC ANALYSIS OF ALGORITHMSOn Worst Case Robin-Hood HashingReporte técnicoinfo:eu-repo/semantics/reportinfo:eu-repo/semantics/publishedVersionreponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaDevroye, LucMorin, PatViola, 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- Universidad de la Repúblicafalse
spellingShingle On Worst Case Robin-Hood Hashing
Devroye, Luc
OPEN ADRESSING
HASHING
ROBIN HOOD
WORST-CASE SEARCH TIME
COLLISION RESOLUTION
PROBABILISTIC ANALYSIS OF ALGORITHMS
status_str publishedVersion
title On Worst Case Robin-Hood Hashing
title_full On Worst Case Robin-Hood Hashing
title_fullStr On Worst Case Robin-Hood Hashing
title_full_unstemmed On Worst Case Robin-Hood Hashing
title_short On Worst Case Robin-Hood Hashing
title_sort On Worst Case Robin-Hood Hashing
topic OPEN ADRESSING
HASHING
ROBIN HOOD
WORST-CASE SEARCH TIME
COLLISION RESOLUTION
PROBABILISTIC ANALYSIS OF ALGORITHMS
url http://hdl.handle.net/20.500.12008/3481