[jira] [Commented] (OAK-922) Optimize UpdateManyChildNodesTest

["Jukka Zitting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713440#comment-13713440 ] 

Jukka Zitting commented on OAK-922:
-----------------------------------

I replaced the O(n^2) algorithm in {{ChildOrderDiff}} with an O(n log n) one in http://svn.apache.org/r1504799. The result:

{noformat}
# UpdateManyChildNodesTest       min     10%     50%     90%     max       N
Oak-Tar                          108     110     115     134    1045     230
{noformat}

And an {{AbstractPropertyState.equals()}} optimization in http://svn.apache.org/r1504800 brought the O\(n) comparison to O(1) for many common cases:

{noformat}
# UpdateManyChildNodesTest       min     10%     50%     90%     max       N
Oak-Tar                           33      34      36      59     523     588
{noformat}
                
> Optimize UpdateManyChildNodesTest
> ---------------------------------
>
>                 Key: OAK-922
>                 URL: https://issues.apache.org/jira/browse/OAK-922
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>
> The {{UpdateManyChildNodesTest}} benchmark looks pretty bad for Oak:
> {noformat}
> # UpdateManyChildNodesTest       min     10%     50%     90%     max       N
> Jackrabbit                        12      14      17      36     486    1263
> Oak-Tar                          380     458     483     548    1079      61
> {noformat}
> The main culprits are an O(n^2) algorithm in {{ChildOrderDiff}}, an O\(n) comparison in {{AbstractPropertyState.equals()}} and some missing SegmentMK optimizations.

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