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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1410) PFOR implementation
Date Tue, 03 Aug 2010 00:53:18 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-1410:
---------------------------------------

    Attachment: LUCENE-1410.patch

Very rough patch with some non-committable optimizations.

The biggest issue was that we were not using the buik-read API when scoring, because the doc
IDs are deltas and because we had to take deletions into account.  I hacked around this (and
other issues)...

I ran some perf tests, described at http://chbits.blogspot.com/2010/08/lucene-performance-with-pfordelta-codec.html

The results are encouraging!  FOR/PFOR gets sizable gains for certain queries.

> PFOR implementation
> -------------------
>
>                 Key: LUCENE-1410
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1410
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Paul Elschot
>            Priority: Minor
>         Attachments: autogen.tgz, for-summary.txt, LUCENE-1410-codecs.tar.bz2, LUCENE-1410.patch,
LUCENE-1410.patch, LUCENE-1410b.patch, LUCENE-1410c.patch, LUCENE-1410d.patch, LUCENE-1410e.patch,
TermQueryTests.tgz, TestPFor2.java, TestPFor2.java, TestPFor2.java
>
>   Original Estimate: 21840h
>  Remaining Estimate: 21840h
>
> Implementation of Patched Frame of Reference.

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