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https://issues.apache.org/jira/browse/LUCENE-4098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-4098:
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Attachment: LUCENE-4098.patch
Patch, w/ the fix for the new random test (now passes).
I also tweaked the random test to sometimes use the PackedInts.copy method.
Finally, I changed PackedInts.copy to alloc a long[] of size min(capacity, len)
so we don't over-allocate if the incoming mem is larger than it needs to be.
I think it's ready! Thanks Adrien.
> 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
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 4.1
>
> 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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