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From "Karl Wettin (JIRA)" <>
Subject [jira] Updated: (LUCENE-550) InstanciatedIndex - faster but memory consuming index
Date Thu, 11 May 2006 15:33:06 GMT
     [ ]

Karl Wettin updated LUCENE-550:

    Attachment: src-1.9karl1_20060611.tar.gz

There is a minor norms bug. The value differst +-3 from the Directory norms. Other than that
it seems to work great.

Now about 40x faster than RAMDirectory.

Stats for test: 500 documents. 1-5K text content.
10 000 * 5 spans
10 000 * 13 term and boolean term queries.
collected top 100 documents for each search results.

InstanciatedIndex is 40x faster than the RAMDirectory.

InstanciatedIndex running on Lucene 1.9-karl1
Corpus creation took 14903 ms.
Span queries took 12884 ms.
Term queries took 30221 ms.

RAMDirectory run on Licene 1.9
Corpus creation took 9337 ms.
Span queries took 253412 ms.
Term queries took 1188492 ms.

> InstanciatedIndex - faster but memory consuming index
> -----------------------------------------------------
>          Key: LUCENE-550
>          URL:
>      Project: Lucene - Java
>         Type: New Feature

>   Components: Store
>     Versions: 1.9
>     Reporter: Karl Wettin
>  Attachments:,,, class_diagram.png, class_diagram.png,
src-1.9karl1_20060611.tar.gz, src.tar.gz, src_20060509.tar.gz
> After fixing the bugs, it's now 4.5 -> 5 times the speed. This is true for both at
index and query time. Sorry if I got your hopes up too much. There are still things to be
done though. Might not have time to do anything with this until next month, so here is the
code if anyone wants a peek.
> Not good enough for Jira yet, but if someone wants to fool around with it, here it is.
The implementation passes a TermEnum -> TermDocs -> Fields -> TermVector comparation
against the same data in a Directory.
> When it comes to features, offsets don't exists and positions are stored ugly and has
> You might notice that norms are float[] and not byte[]. That is me who refactored it
to see if it would do any good. Bit shifting don't take many ticks, so I might just revert
> I belive the code is quite self explaining.
> InstanciatedIndex ii = ..
> InstanciatedIndexReader();
> ii.addDocument(s).. replace IndexWriter for now.

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