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https://issues.apache.org/jira/browse/LUCENE-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13395894#comment-13395894
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Han Jiang commented on LUCENE-3892:
-----------------------------------
There's a potential bottleneck during method calling...Here is an example for
PFor, with blocksize=128, exception rate = 97%, normal value <= 2 bits,
exception value <= 32 bits:
{noformat}
Decoding normal values: 4703 ns
Patching exceptions: 5797 ns
Single call of PForUtil.decompress totally takes: 58318 ns
{noformat}
In addition, it costs about 4000ns to record the time span.
> Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta,
> Simple9/16/64, etc.)
> -------------------------------------------------------------------------------------
>
> Key: LUCENE-3892
> URL: https://issues.apache.org/jira/browse/LUCENE-3892
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Labels: gsoc2012, lucene-gsoc-12
> Fix For: 4.1
>
> Attachments: LUCENE-3892_for.patch, LUCENE-3892_pfor.patch,
> LUCENE-3892_pfor.patch, LUCENE-3892_pfor.patch, LUCENE-3892_settings.patch,
> LUCENE-3892_settings.patch
>
>
> On the flex branch we explored a number of possible intblock
> encodings, but for whatever reason never brought them to completion.
> There are still a number of issues opened with patches in different
> states.
> Initial results (based on prototype) were excellent (see
> http://blog.mikemccandless.com/2010/08/lucene-performance-with-pfordelta-codec.html
> ).
> I think this would make a good GSoC project.
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