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https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16823295#comment-16823295
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Atri Sharma commented on LUCENE-8757:
-------------------------------------
Attached is a first cut for the patch. The main idea there is that smaller
segments are coalesced into single threads with a hard cap on the number of
segments per thread to avoid overwhelming a single thread.
This can be enhanced with taking number of cores on the machine and current CPU
utilization, but that might lead to a higher IndexSearcher bootstrap time.
Comments and thoughts are welcome.
> 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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