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From "Michael McCandless (JIRA)" <>
Subject [jira] [Resolved] (LUCENE-4098) Efficient bulk operations for packed integer arrays
Date Sat, 02 Jun 2012 18:38:23 GMT


Michael McCandless resolved LUCENE-4098.

       Resolution: Fixed
    Fix Version/s:     (was: 4.1)

Thanks Adrien!
> Efficient bulk operations for packed integer arrays
> ---------------------------------------------------
>                 Key: LUCENE-4098
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/other
>            Reporter: Adrien Grand
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 4.0, 5.0
>         Attachments: LUCENE-4098.patch, LUCENE-4098.patch, LUCENE-4098.patch
> 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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