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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2012/06/01 15:26:22 UTC
[jira] [Updated] (LUCENE-4098) Efficient bulk operations for packed
integer arrays
[ https://issues.apache.org/jira/browse/LUCENE-4098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand updated LUCENE-4098:
---------------------------------
Attachment: LUCENE-4098.patch
Slightly updated patch that fixes the computation of maxValue in GrowableWriter and uses | instead of Math.max to compute the max value when performing a bulk set (since GrowableWriter only works with unsigned integers).
As a side note, the reason why I didn't write bulk get and set methods for Packed64 is that I didn't find how to do it efficiently (= with less instructions and no conditional) without writing specialized methods for every bitsPerValue.
> 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
>
> Attachments: 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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