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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-28404]  Database Server has a lot of free ram but doen&apos;t use it</title>
                <link>https://jira.mongodb.org/browse/SERVER-28404</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We are running several aws ec2 servers with ubuntu 16.04 and mongodb that have all 2GB of ram, but the database does not use more than around 1GB even though the database itself is growing and growing in size.&lt;br/&gt;
also it seems that some process makes the kswapd0 process going nuts trying to swap.&lt;/p&gt;

&lt;p&gt;Is there any hidden setting that limits mongodb in the amount of ram it is allowed to use?&lt;/p&gt;</description>
                <environment></environment>
        <key id="366471">SERVER-28404</key>
            <summary> Database Server has a lot of free ram but doen&apos;t use it</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="blinkit-tobi">Tobias S. Keller</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Mar 2017 01:01:11 +0000</created>
                <updated>Wed, 31 May 2017 21:23:35 +0000</updated>
                            <resolved>Tue, 21 Mar 2017 17:31:28 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1529531" author="mark.agarunov" created="Tue, 21 Mar 2017 17:30:54 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blinkit-tobi&quot; class=&quot;user-hover&quot; rel=&quot;blinkit-tobi&quot;&gt;blinkit-tobi&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. Assuming you are using the WiredTiger storage engine, the default memory usage is &lt;a href=&quot;https://docs.mongodb.com/manual/faq/storage/#to-what-size-should-i-set-the-wiredtiger-internal-cache&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;50% of RAM minus 1 GB, or 256MB, whichever is larger&lt;/a&gt;. This can be changed by setting the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/configuration-options/#storage.wiredTiger.engineConfig.cacheSizeGB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;storage.wiredTiger.engineConfig.cacheSizeGB&lt;/tt&gt; parameter&lt;/a&gt; in the configuration.&lt;/p&gt;

&lt;p&gt;Please note that SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-user group.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
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