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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8757) Better Segment To Thread Mapping Algorithm
Date Tue, 07 May 2019 07:23:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16834444#comment-16834444
] 

Simon Willnauer commented on LUCENE-8757:
-----------------------------------------

> Would it make sense to push this patch, and then let users consume it and provide feedback
while we iterate on the more sophisticated version? We could even have both of the methods
available as options to users, potentially

I don't think we should push this if we already know we wanna do something different. That
said, I am not convinced the numbers are good defaults. At the same time I don't have any
numbers here do you have anything to back these defaults up?

> 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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