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    <title>MongoDB Jira</title>
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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16182] Under WiredTiger actual leaf_page_max appears to be 75% of specified value</title>
                <link>https://jira.mongodb.org/browse/SERVER-16182</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With default leaf_page_max of 32 kB for collections, actual leaf pages appear never to be larger than 24 kB; 16 kB is default for indexes but actual leaf pages are never larger than 12 kB. Increase leaf_page_max to 64 kB and observed leaf page sizes are never larger than 48 kB.&lt;/p&gt;</description>
                <environment></environment>
        <key id="169632">SERVER-16182</key>
            <summary>Under WiredTiger actual leaf_page_max appears to be 75% of specified value</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>wiredtiger</label>
                    </labels>
                <created>Mon, 17 Nov 2014 13:31:45 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:34 +0000</updated>
                            <resolved>Mon, 17 Nov 2014 22:58:02 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                                    <component>Diagnostics</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="766875" author="bruce.lucas@10gen.com" created="Tue, 18 Nov 2014 15:21:14 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=agorrod&quot; class=&quot;user-hover&quot; rel=&quot;agorrod&quot;&gt;agorrod&lt;/a&gt;. So does that mean for tables like MongoDB collections where (I believe) inserts are always at the end, a split_pct of 100 would be fine? Would there be any advantage to setting it to 100% - for example, would it save memory, or does leaf_page_max have no effect on the amount of memory allocated for a page?&lt;/p&gt;</comment>
                            <comment id="766495" author="agorrod" created="Mon, 17 Nov 2014 22:54:47 +0000"  >&lt;p&gt;This behavior is deliberate. There is a configuration for WiredTiger WT_SESSION::create that allows you to tune how full we make leaf pages called &quot;split_pct&quot;. You can read about it in the documentation here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://source.wiredtiger.com/2.4.1/struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://source.wiredtiger.com/2.4.1/struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The reason we don&apos;t fill pages up completely when they are first created is to allow space for future updates without needing to split into multiple pages.&lt;/p&gt;</comment>
                            <comment id="765739" author="eliot" created="Mon, 17 Nov 2014 13:35:39 +0000"  >&lt;p&gt;Is this actually a thing to change?&lt;br/&gt;
Seems like its just part of their math which is fine...&lt;/p&gt;</comment>
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