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From "Atri Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8757) Better Segment To Thread Mapping Algorithm
Date Mon, 06 May 2019 17:57:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16834065#comment-16834065
] 

Atri Sharma commented on LUCENE-8757:
-------------------------------------

Hi [~simonw],

 

Spending a bit more time thinking about your suggestions, I agree that it is a great idea,
albeit requiring more thought and effort than what this Jira proposes to achieve.

I have opened LUCENE-8794 - Cost Based Slice Allocation Algorithm for discussing the same.
Please share your thoughts.

 

Would it make sense to push this patch, and then let users consume it and provide feedback
while we iterate on the more sophisticated version? We could even have both of the methods
available as options to users, potentially

 

Thoughts?

 

> 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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