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Posted to issues@lucene.apache.org by "Robert Muir (Jira)" <ji...@apache.org> on 2021/02/21 14:32:00 UTC
[jira] [Commented] (LUCENE-9795) investigate large checkindex
regression in nightly benchmarks
[ https://issues.apache.org/jira/browse/LUCENE-9795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17287976#comment-17287976 ]
Robert Muir commented on LUCENE-9795:
-------------------------------------
This seems to also impact some, but not all, of the grouping queries too: (Term1M etc).
!Screen_Shot_2021-02-21_at_09.30.30.png!
> investigate large checkindex regression in nightly benchmarks
> -------------------------------------------------------------
>
> Key: LUCENE-9795
> URL: https://issues.apache.org/jira/browse/LUCENE-9795
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Priority: Major
> Attachments: Screen_Shot_2021-02-21_at_09.17.53.png, Screen_Shot_2021-02-21_at_09.30.30.png
>
>
> In the nightly benchmark, checkindex times increased more than 4x on the 2/16 datapoint
> Looking at the commits on 2/15, most obvious thing to look into is docvalues terms dict compression: LUCENE-9663
> Will try to pinpoint it more, my concern is some perf bug such as every single term causing decompression of the whole block repeatedly (missing seek-within-block opto?)
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