lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4171) Performance improvements to Packed64
Date Thu, 28 Jun 2012 12:57:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403070#comment-13403070
] 

Adrien Grand commented on LUCENE-4171:
--------------------------------------

Even if {{Packed64}} used one or two additional blocks to avoid branches, the reader and the
writer always read/wrote the exact number of required blocks (this is why ctor #3 reads {{size}}
longs instead of {{blocks.length == size + 1}} blocks). So this should not be a problem.

Can you fix ctor #1 so that it uses the size method instead of {{valueCount * bitsPerValue
/ BLOCK_SIZE + 1}} (this may create one more block than required: for example, if bitsPerValue=1
and valueCount=64, blocks will have a length of 2 while only 1 block is required)?
                
> Performance improvements to Packed64
> ------------------------------------
>
>                 Key: LUCENE-4171
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4171
>             Project: Lucene - Java
>          Issue Type: Sub-task
>          Components: core/other
>    Affects Versions: 4.0, 5.0
>         Environment: Tested with 4 different Intel machines
>            Reporter: Toke Eskildsen
>            Priority: Minor
>              Labels: performance
>         Attachments: LUCENE-4171.patch, LUCENE-4171.patch, LUCENE-4171.patch
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> Based on the performance measurements of PackedInts.Mutable's in LUCENE-4062, a new version
of Packed64 has been created that is consistently faster than the old Packed64 for both get
and set.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message