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Posted to dev@lucene.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2019/07/02 06:00:00 UTC
[jira] [Commented] (LUCENE-8757) Better Segment To Thread Mapping
Algorithm
[ https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16876685#comment-16876685 ]
ASF subversion and git services commented on LUCENE-8757:
---------------------------------------------------------
Commit 8448a33ed8ffc978497a0d21e8042a61bf0ddd04 in lucene-solr's branch refs/heads/branch_8x from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=8448a33 ]
LUCENE-8757: Revert on 8.x.
> 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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