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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-21805] RAM usage - slow down server</title>
                <link>https://jira.mongodb.org/browse/SERVER-21805</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a replica set with one secondary and one arbiter (each on a different server) and moved from MMapv1 to WiredTiger. Primary and Secondary each have 32 GB. We have now a process where we read each document once. The mongod process uses all of the 32 GB RAM and the server is very slow.  &lt;br/&gt;
Attached you will find our serverStatus: wt cache size is 16 GB, tcmalloc size is 26 GB. &lt;br/&gt;
So the question for us is, why WT uses all of the 32 GB and swaps now and how can we fix that. Also, if we upgrade to a new version, we see in the jira tasks, that there are a lot of problems with memory leaks together with WT. So what recommendation do you have.&lt;/p&gt;

&lt;p&gt;free -m output:&lt;br/&gt;
            total       used       free     shared    buffers     cached&lt;br/&gt;
Mem:         32136      31727        409          0          9       2899&lt;br/&gt;
-/+ buffers/cache:      28819       3317&lt;br/&gt;
Swap:        49152        609      48543&lt;/p&gt;</description>
                <environment></environment>
        <key id="242930">SERVER-21805</key>
            <summary>RAM usage - slow down server</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="k9908600@gmx.at">Niti Test</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Dec 2015 06:42:50 +0000</created>
                <updated>Wed, 9 Dec 2015 15:03:47 +0000</updated>
                            <resolved>Wed, 9 Dec 2015 15:03:47 +0000</resolved>
                                    <version>3.0.3</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1109386" author="ramon.fernandez" created="Wed, 9 Dec 2015 15:03:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=k9908600%40gmx.at&quot; class=&quot;user-hover&quot; rel=&quot;k9908600@gmx.at&quot;&gt;k9908600@gmx.at&lt;/a&gt;, there are some known issues with excessive memory consumption in early 3.0 versions, so I&apos;d recommend you upgrade to 3.0.7. Note that 3.2.0 was released yesterday and contains many improvements in this area, as well as new features and performance enhancements, so you may want to give 3.2.0 a try.&lt;/p&gt;

&lt;p&gt;Both for 3.0 and 3.2 you should be aware of the &lt;a href=&quot;https://docs.mongodb.org/manual/reference/program/mongod/#cmdoption--wiredTigerCacheSizeGB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WiredTiger cache size&lt;/a&gt; and can try lowering its value.&lt;/p&gt;

&lt;p&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 question will reach a larger audience. A question like this 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;</comment>
                    </comments>
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                            <attachment id="101355" name="sm11_serverStatus.txt" size="25745" author="k9908600@gmx.at" created="Wed, 9 Dec 2015 06:42:50 +0000"/>
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