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From "Atri Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8757) Better Segment To Thread Mapping Algorithm
Date Wed, 01 May 2019 11:38:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16830958#comment-16830958
] 

Atri Sharma commented on LUCENE-8757:
-------------------------------------

Hi [~mikemccand]

 

Thanks for taking a look at the patch. I have attached an updated patch which fixes your comments.

For the constants, I think I was being too conservative in not using too many threads :)

 

Please let me know if the current patch seems sane

> Better Segment To Thread Mapping Algorithm
> ------------------------------------------
>
>                 Key: LUCENE-8757
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8757
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Atri Sharma
>            Priority: Major
>         Attachments: LUCENE-8757.patch
>
>
> The current segments to threads allocation algorithm always allocates one thread per
segment. This is detrimental to performance in case of skew in segment sizes since small segments
also get their dedicated thread. This can lead to performance degradation due to context switching
overheads.
>  
> A better algorithm which is cognizant of size skew would have better performance for
realistic scenarios



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