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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-4489] Need clarification on how to read memory statistics in the UNIX top command</title>
                <link>https://jira.mongodb.org/browse/DOCS-4489</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Source : &lt;a href=&quot;http://docs.mongodb.org/manual/faq/diagnostics/#how-do-i-read-memory-statistics-in-the-unix-top-command&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/diagnostics/#how-do-i-read-memory-statistics-in-the-unix-top-command&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;&lt;b&gt;How do I read memory statistics in the UNIX top command&lt;/b&gt;&lt;br/&gt;
Because mongod uses memory-mapped files, the memory statistics in top require interpretation in a special way. On a large database, VSIZE (virtual bytes) tends to be the size of the entire database. If the mongod doesn&#8217;t have other processes running, RSIZE (resident bytes) is the total memory of the machine, as this counts file system cache contents.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The description of RSIZE is not completely accurate. It &lt;em&gt;can&lt;/em&gt; be the total memory size of the machine (less a small fraction) but only if various conditions are met, e.g. workload (read vs write), readahead settings, etc. It is not, however, accurate to state that it counts the file system cache contents as there are cases when data can be in RAM but not accounted for by the mongod process (due to the memory mapping and remapping behavior in the kernel)&lt;/p&gt;</description>
                <environment></environment>
        <key id="173432">DOCS-4489</key>
            <summary>Need clarification on how to read memory statistics in the UNIX top command</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="andrew.feierabend@mongodb.com">Andrew Feierabend</assignee>
                                    <reporter username="ronan.bohan@mongodb.com">Ronan Bohan</reporter>
                        <labels>
                            <label>bite-sized</label>
                    </labels>
                <created>Tue, 9 Dec 2014 10:02:08 +0000</created>
                <updated>Mon, 30 Oct 2023 21:50:32 +0000</updated>
                            <resolved>Tue, 15 Oct 2019 21:13:37 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2483803" author="andrew.feierabend" created="Tue, 15 Oct 2019 21:13:37 +0000"  >&lt;p&gt;This FAQ regarding &lt;tt&gt;top&lt;/tt&gt; is no longer part of this page.&lt;/p&gt;</comment>
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