[jira] [Commented] (IGNITE-11156) FreeLists are overflowed with pages with almost no free space left

["Ivan Rakov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-11156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756447#comment-16756447 ] 

Ivan Rakov commented on IGNITE-11156:
-------------------------------------

TC: https://ci.ignite.apache.org/viewQueued.html?itemId=2955008

> FreeLists are overflowed with pages with almost no free space left
> ------------------------------------------------------------------
>
>                 Key: IGNITE-11156
>                 URL: https://issues.apache.org/jira/browse/IGNITE-11156
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Ivan Rakov
>            Assignee: Ivan Rakov
>            Priority: Major
>             Fix For: 2.8
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> {code:java}
>     /** */
>     private static final int MIN_PAGE_FREE_SPACE = 8;
> {code}
> If data page has 8 unused bytes or more, it will be stored in a free list. As result, free lists mostly contain "free pages" that are actually useless: pair of (boolean, boolean) takes approximately 50 bytes. I think, we'll increase this constant to something like 40, memory will be used more efficiently and WAL usage will decrease in result.



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