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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>[SERVER-24267] MongoDB is not utilizing all available memory.</title>
                <link>https://jira.mongodb.org/browse/SERVER-24267</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a stand-alone MongoDB instance running in windows. It&apos;s recently experiencing slowness and my troubleshooting has found the following symptoms:&lt;/p&gt;

&lt;p&gt;1. The slowness normally occurs after a full text search query against a huge collection. I guess this is because it swaps many pages in the collection from disk into memory hence data from other collections are squeezed out of memory.&lt;/p&gt;

&lt;p&gt;2. The server memory usage is capped around 55%. The server (Win2012) has 32GB of memory but MongoDB is not trying to utilize beyond 16GB.&lt;/p&gt;

&lt;p&gt;I have seen a couple of Q&amp;amp;A in limiting MongoDB memory usage but not on how to encourage MongoDB to be more greedy.&lt;/p&gt;

&lt;p&gt;MongoDB: 3.2.0&lt;br/&gt;
Storage Engine: wiredTiger&lt;br/&gt;
OS: Win2012&lt;br/&gt;
Memory: 32GB&lt;/p&gt;</description>
                <environment></environment>
        <key id="288869">SERVER-24267</key>
            <summary>MongoDB is not utilizing all available memory.</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="-1">Unassigned</assignee>
                                    <reporter username="xuguoming@nexlabs.com">Yang</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 May 2016 02:19:15 +0000</created>
                <updated>Thu, 26 May 2016 02:57:24 +0000</updated>
                            <resolved>Tue, 24 May 2016 11:17:32 +0000</resolved>
                                    <version>3.2.0</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1275798" author="xuguoming@nexlabs.com" created="Thu, 26 May 2016 02:57:24 +0000"  >&lt;p&gt;Hi Dan, thanks a lot. This is indeed the cause. &lt;/p&gt;</comment>
                            <comment id="1274848" author="dan@10gen.com" created="Wed, 25 May 2016 14:54:30 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xuguoming%40nexlabs.com&quot; class=&quot;user-hover&quot; rel=&quot;xuguoming@nexlabs.com&quot;&gt;xuguoming@nexlabs.com&lt;/a&gt;, this link in the documentation may help understand the relationship between the WiredTiger cache size and file system cache.  &lt;a href=&quot;https://docs.mongodb.com/manual/faq/storage/#to-what-size-should-i-set-the-wiredtiger-cache&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/faq/storage/#to-what-size-should-i-set-the-wiredtiger-cache&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1273173" author="ramon.fernandez" created="Tue, 24 May 2016 11:17:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xuguoming%40nexlabs.com&quot; class=&quot;user-hover&quot; rel=&quot;xuguoming@nexlabs.com&quot;&gt;xuguoming@nexlabs.com&lt;/a&gt;, please note that the 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;, where your questions will reach a larger audience. Questions like these involving more discussion would be best posted 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;. See also our &lt;a href=&quot;https://www.mongodb.org/about/support/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Support page&lt;/a&gt; for additional support resources.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;
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