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https://issues.apache.org/jira/browse/IGNITE-7638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16355480#comment-16355480
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Dmitriy Pavlov commented on IGNITE-7638:
----------------------------------------
Fast fix with migrating continious removed segments to empty if last one is
empty gives some considerable effect.
Segments statistics in my test is as follows:
{noformat}
Avg steps in loaded pages table, get: 348 steps, 4358 ops/sec, put: 1037
steps, 1380 ops/sec, capacity: 20242 size: 7978 removedCnt: 12023 emptyCnt:
241 rmv->empty cells: 20624
Avg steps in loaded pages table, get: 183 steps, 7715 ops/sec, put: 788 steps,
1624 ops/sec, capacity: 20242 size: 7978 removedCnt: 12060 emptyCnt: 204
rmv->empty cells: 18963
Avg steps in loaded pages table, get: 235 steps, 7874 ops/sec, put: 1050
steps, 1721 ops/sec, capacity: 20242 size: 7978 removedCnt: 12066 emptyCnt:
198 rmv->empty cells: 19910
Avg steps in loaded pages table, get: 421 steps, 8345 ops/sec, put: 2048
steps, 1643 ops/sec, capacity: 20242 size: 7978 removedCnt: 12233 emptyCnt: 31
rmv->empty cells: 17944
Avg steps in loaded pages table, get: 349 steps, 7883 ops/sec, put: 1683
steps, 1559 ops/sec, capacity: 20242 size: 7978 removedCnt: 12078 emptyCnt:
186 rmv->empty cells: 18935
Avg steps in loaded pages table, get: 264 steps, 8060 ops/sec, put: 1283
steps, 1568 ops/sec, capacity: 20242 size: 7978 removedCnt: 12105 emptyCnt:
159 rmv->empty cells: 18854
Avg steps in loaded pages table, get: 405 steps, 8289 ops/sec, put: 1781
steps, 1856 ops/sec, capacity: 20242 size: 7978 removedCnt: 12142 emptyCnt:
122 rmv->empty cells: 18529
Avg steps in loaded pages table, get: 347 steps, 8059 ops/sec, put: 1494
steps, 1873 ops/sec, capacity: 20242 size: 7978 removedCnt: 12097 emptyCnt:
167 rmv->empty cells: 19652
{noformat}
> 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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