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From "Dmitriy Pavlov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-7638) Page replacement process in PDS mode affect segment loaded pages table performance
Date Tue, 06 Mar 2018 12:18:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-7638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387685#comment-16387685
] 

Dmitriy Pavlov commented on IGNITE-7638:
----------------------------------------

https://reviews.ignite.apache.org/ignite/review/IGNT-CR-510
https://github.com/apache/ignite/pull/3481
https://ci.ignite.apache.org/viewType.html?buildTypeId=IgniteTests24Java8_RunAll&branch_IgniteTests24Java8=pull%2F3481%2Fhead&tab=buildTypeStatusDiv


> Page replacement process in PDS mode affect segment loaded pages table performance
> ----------------------------------------------------------------------------------
>
>                 Key: IGNITE-7638
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7638
>             Project: Ignite
>          Issue Type: Bug
>          Components: persistence
>            Reporter: Dmitriy Pavlov
>            Assignee: Dmitriy Pavlov
>            Priority: Critical
>             Fix For: 2.5
>
>
> There is 
> - durable memory segment in PDS enabled data region 
> - page replacement started
> then Ignite performance slow down occurs, JFR & Visual VM shows get&put from
FullPageIdTable requires significiant time to be executed (~5-10% оf samples count and up
to 40% CPU usage)
> {noformat}
> Avg steps in loaded pages table, get: 9456 steps,  put: 20243 steps,  capacity: 20242
size: 7978
> {noformat}
> Effect of influence of FullPageID table is cumulative, once it starts to grow, number
of steps required grows also.



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