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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-4536) Make PackedInts byte-aligned?
Date Wed, 07 Nov 2012 00:34:13 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adrien Grand updated LUCENE-4536:
---------------------------------

    Attachment: LUCENE-4536.patch

New patch including Mike's suggestions:
 - VERSION_LONG_ALIGNED renamed to VERSION_START,
 - VERSION_CURRENT aliased to VERSION_BYTE_ALIGNED,
 - added an assert that the sneaky direct reader impl can only be instantiated if the stream
has been produced with VERSION_START.
                
> Make PackedInts byte-aligned?
> -----------------------------
>
>                 Key: LUCENE-4536
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4536
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.1
>
>         Attachments: LUCENE-4536.patch, LUCENE-4536.patch
>
>
> PackedInts are more and more used to save/restore small arrays, but given that they are
long-aligned, up to 63 bits are wasted per array. We should try to make PackedInts storage
byte-aligned so that only 7 bits are wasted in the worst case.

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