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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2019/07/02 06:02:00 UTC
[jira] [Updated] (LUCENE-8757) Better Segment To Thread Mapping
Algorithm
[ https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Adrien Grand updated LUCENE-8757:
---------------------------------
Fix Version/s: (was: 8.2)
> 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)
>
> 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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