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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