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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8757) Better Segment To Thread Mapping Algorithm
Date Mon, 20 May 2019 07:31:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16843726#comment-16843726
] 

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

[~atris] can we instead of asserting the order just sort the slice in LeafSlice ctor? This
should prevent any issues down the road and it's cheap enough IMO

> 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
>            Assignee: Simon Willnauer
>            Priority: Major
>         Attachments: LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch,
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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