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https://issues.apache.org/jira/browse/LUCENE-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13289104#comment-13289104
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Han Jiang commented on LUCENE-3892:
-----------------------------------
Thanks Mike, we have so much details to help optimize!
bq.Still missing a couple license headers (TestMin, TestCompress)...
Ok, I'll add them later.
bq.I ran a quick perf test using
http://code.google.com/a/apache-extras.org/p/luceneutil on a 10M doc Wikipedia
index.
The script is wonderful! But the wiki data is missing? Can I get it from a wiki
dump instead?
bq.Indexing time is ~18% slower than Lucene40PostingsFormat (1071 sec vs 1261
sec).
Yes, it is expected, actually it scans every block 33 times to estimate
metadata such as numFrameBits and numExceptions.
> 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_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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