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Date: Sun, 23 Oct 2011 21:28:32 +0000 (UTC)
From: "Martijn van Groningen (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (LUCENE-3509) Add settings to IWC to optimize
 IDV indices for CPU or RAM respectivly
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    [ https://issues.apache.org/jira/browse/LUCENE-3509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13133753#comment-13133753 ] 

Martijn van Groningen commented on LUCENE-3509:
-----------------------------------------------

Maybe this makes sense IWC is high level. Maybe this should be just an option somewhere in IndexDocValues with the name "fasterButMoreRAM". If this option is set to true an implementation will choose performance over RAM. In the case that an implementation uses SimpleText this option wouldn't have an influence, but for packed integers it would have an influence.

Maybe we should have IndexDocValuesConfig class for DV based settings. I can imagine that we will have more DV based settings in the future...
                
> Add settings to IWC to optimize IDV indices for CPU or RAM respectivly
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-3509
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3509
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/index
>    Affects Versions: 4.0
>            Reporter: Simon Willnauer
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-3509.patch
>
>
> spinnoff from LUCENE-3496 - we are seeing much better performance if required bits for PackedInts are rounded up to a 8/16/32/64. We should add this option to IWC and default to round up ie. more RAM & faster lookups.

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