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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-9228] 3.0 Wired Tiger cache utilization documentation needs to say it rounds down to the closest whole integer value of GB</title>
                <link>https://jira.mongodb.org/browse/DOCS-9228</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;I have confirmed the behavior with the Wired Tiger development team.  By default, the Wired Tiger cache will be set to a rounded down whole integer value GB.  In your system, we see that the memory configured is &lt;/p&gt;

&lt;p&gt;```&lt;br/&gt;
MemTotal: 8057784 kB &lt;br/&gt;
```&lt;/p&gt;

&lt;p&gt;50% of this is 4028892 KB =~ 3.8GB.  This gets rounded down to 3GB. &lt;/p&gt;

&lt;p&gt;See the following:&lt;/p&gt;

&lt;p&gt;```&lt;br/&gt;
    &amp;gt; db.adminCommand( &lt;/p&gt;
{ &quot;setParameter&quot;: 1, &quot;wiredTigerEngineRuntimeConfig&quot;: &quot;cache_size=3.7G&quot;}
&lt;p&gt;)&lt;/p&gt;
    {
    	&quot;was&quot; : &quot;&quot;,
    	&quot;code&quot; : 2,
    	&quot;ok&quot; : 0,
    	&quot;errmsg&quot; : &quot;WiredTiger reconfiguration failed with error code (22): Invalid argument&quot;
    }
&lt;p&gt;```&lt;/p&gt;

&lt;p&gt;This shows that the parameter needs to be a whole integer value.&lt;/p&gt;

&lt;p&gt;```&lt;br/&gt;
    &amp;gt; db.adminCommand( &lt;/p&gt;
{ &quot;setParameter&quot;: 1, &quot;wiredTigerEngineRuntimeConfig&quot;: &quot;cache_size=4G&quot;}
&lt;p&gt;)&lt;/p&gt;
    { &quot;was&quot; : &quot;&quot;, &quot;ok&quot; : 1 }
&lt;p&gt;```&lt;/p&gt;

&lt;p&gt;We should clarify that we aren&apos;t actually using 50% in 3.0.&lt;/p&gt;</description>
                <environment></environment>
        <key id="327604">DOCS-9228</key>
            <summary>3.0 Wired Tiger cache utilization documentation needs to say it rounds down to the closest whole integer value of GB</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="shakir.sadikali@mongodb.com">Shakir Sadikali</reporter>
                        <labels>
                            <label>bite-sized</label>
                    </labels>
                <created>Fri, 28 Oct 2016 13:36:45 +0000</created>
                <updated>Mon, 30 Oct 2023 21:23:02 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4940873" author="edu.bot" created="Mon, 31 Oct 2022 16:12:12 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1420391" author="thomas.schubert" created="Fri, 28 Oct 2016 13:47:54 +0000"  >&lt;p&gt;In MongoDB 3.4, WiredTiger cache size will not be rounded down, see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23624&quot; title=&quot;Allow wiredTigerCacheSizeGB to be specified as a float&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23624&quot;&gt;&lt;del&gt;SERVER-23624&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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