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Primary clustering

In computer programming, primary clustering is a phenomenon that causes performance degradation in linear-probing hash tables. The phenomenon states that, as elements are added to a linear probing hash table, they have a tendency to cluster together into long runs (i.e., long contiguous regions of the hash table that contain no free slots). If the hash…

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Causes of primary clustering

Positive feedbackStandard deviation
2 related topics

Effect on performance

Lazy deletions
1 related topics

Techniques for avoiding primary clustering

Quadratic probing
1 related topics

Overview

Computer programmingLinear-probing hash tables
2 related topics

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Overview

Causes of primary clustering

Effect on performance

Techniques for avoiding primary clustering

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Map overview Semantic statistics

Primary clustering

Nodes11
Edges10
Triples31
Avg. degree1.82
Density0.181818
Components1

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Primary clustering

Top relations

related to Effect on performance · 9
Primary clustering → As, However, Insertions, It, Negative, Positive, Primary, These, Theta
related to Techniques for avoiding primary clustering · 8
Primary clustering → Every, Graveyard, Ordered, Robin Hood, The, These, This, Thus
related to Common misconceptions · 7
Primary clustering → For, However, Knuth, Many, Some, Theta, This
has cause · 6
Primary clustering → However, Joining, Primary, The, This, Winner
is a · 1
Primary clustering → phenomenon that causes performance degradation in linear-probing hash tables

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Important terminology

displaystyle hash expected clustering table primary theta queries time causes run element linear probing insertions take positive elements query performance

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Primary clusteringis aphenomenon that causes performance degradation in linear-probing hash tables0.90text
Primary clusteringhas causePrimary0.60section
Primary clusteringhas causeWinner0.60section
Primary clusteringhas causeThe0.60section
Primary clusteringhas causeThis0.60section
Primary clusteringhas causeHowever0.60section
Primary clusteringhas causeJoining0.60section
Primary clusteringrelated to Common misconceptionsMany0.60section
Primary clusteringrelated to Common misconceptionsHowever0.60section
Primary clusteringrelated to Common misconceptionsKnuth0.60section
Primary clusteringrelated to Common misconceptionsSome0.60section
Primary clusteringrelated to Common misconceptionsTheta0.60section

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