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https://issues.apache.org/jira/browse/LUCENE-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419381#comment-13419381
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Robert Muir commented on LUCENE-3892:
-------------------------------------
{quote}
I'm afraid that the for loop of readLong() hurts the performance. Here is the
comparison against last patch:
{quote}
I think so too. I think in each enum, up front you want a pre-allocated byte[]
(maximum size possible for the block),
and you do ByteBuffer.wrap(x).asLongBuffer.
after you read the header, call readBytes() and then just rewind()?
So this is just like what you do now in the branch, except with LongBuffer
instead of IntBuffer
> 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-BlockTermScorer.patch,
> LUCENE-3892-blockFor-with-packedints-decoder.patch,
> LUCENE-3892-blockFor-with-packedints.patch,
> LUCENE-3892-direct-IntBuffer.patch, LUCENE-3892-for&pfor-with-javadoc.patch,
> LUCENE-3892-for&pfor-with-javadoc.patch,
> LUCENE-3892-for&pfor-with-javadoc.patch,
> LUCENE-3892-for&pfor-with-javadoc.patch, LUCENE-3892-for&pfor.patch,
> LUCENE-3892-handle_open_files.patch,
> LUCENE-3892-pfor-compress-iterate-numbits.patch,
> LUCENE-3892-pfor-compress-slow-estimate.patch, LUCENE-3892_for.patch,
> LUCENE-3892_for_byte[].patch, LUCENE-3892_for_int[].patch,
> LUCENE-3892_for_unfold_method.patch, LUCENE-3892_pfor.patch,
> LUCENE-3892_pfor.patch, LUCENE-3892_pfor.patch,
> LUCENE-3892_pfor_unfold_method.patch, LUCENE-3892_pulsing_support.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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