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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8757) Better Segment To Thread Mapping Algorithm
Date Wed, 22 May 2019 07:12:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16845598#comment-16845598
] 

ASF subversion and git services commented on LUCENE-8757:
---------------------------------------------------------

Commit dbfa8454e21bef1eb4ecabef7de6d801cadc2df8 in lucene-solr's branch refs/heads/branch_8x
from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=dbfa845 ]

LUCENE-8757: Fix test bug.


> 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
>             Fix For: master (9.0), 8.2
>
>         Attachments: LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch,
LUCENE-8757.patch, 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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