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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4540) Allow packed ints norms
Date Tue, 06 Nov 2012 09:36:12 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491341#comment-13491341
] 

Simon Willnauer commented on LUCENE-4540:
-----------------------------------------

+1 - should we also document that we don't have similarities that can make use of it at this
point?

                
> Allow packed ints norms
> -----------------------
>
>                 Key: LUCENE-4540
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4540
>             Project: Lucene - Core
>          Issue Type: Task
>          Components: core/index
>            Reporter: Robert Muir
>         Attachments: LUCENE-4540.patch
>
>
> I was curious what the performance would be, because it might be useful option to use
packedints for norms if you have lots of fields and still want good scoring: 
> Today the smallest norm per-field-per-doc you can use is a single byte, and if you have
_f_ fields with norms enabled and _n_ docs, it uses _f_ * _n_ bytes of space in RAM.
> Especially if you aren't using index-time boosting (or even if you are, but not with
ridiculous values), this could be wasting a ton of RAM.
> But then I noticed there was no clean way to allow you to do this in your Similarity:
its a trivial patch.

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