Atri Sharma created LUCENE-8757:
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             Summary: 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


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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