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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4098) Efficient bulk operations for packed integer arrays
Date Thu, 31 May 2012 17:34:23 GMT
Adrien Grand created LUCENE-4098:
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             Summary: Efficient bulk operations for packed integer arrays
                 Key: LUCENE-4098
                 URL: https://issues.apache.org/jira/browse/LUCENE-4098
             Project: Lucene - Java
          Issue Type: Improvement
          Components: core/other
            Reporter: Adrien Grand
            Priority: Minor
             Fix For: 4.1


There are some places in Lucene code that {iterate over,set} ranges of values of a packed
integer array. Because bit-packing implementations (Packed*) tend be slower than direct implementations,
this can take a lot of time.

For example, under some scenarii, GrowableWriter can take most of its (averaged) {{set}} time
in resizing operations.

However, some bit-packing schemes, such as the one that is used by {{Packed64SingleBlock*}},
allow to implement efficient bulk operations such as get/set/fill. Implementing these bulk
operations in {{PackedInts.{Reader,Mutable}}} and using them across other components instead
of their single-value counterpart could help improve performance.

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