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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-491] Working-set calculation, RAM, oplog, non-mapped memory, and faults</title>
                <link>https://jira.mongodb.org/browse/DOCS-491</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Based on customer interaction, it seems we need a better doc than this one for calculating how much RAM you need for your app:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Checking+Server+Memory+Usage#CheckingServerMemoryUsage-WorkingSetSize&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Checking+Server+Memory+Usage#CheckingServerMemoryUsage-WorkingSetSize&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I think there&apos;s some useful verbiage in my responses to CS-4233, and probably scattered all over in a million answers from 10gen staff to questions over the years of the form, &quot;Do I have enough RAM?&quot;&lt;/p&gt;

&lt;p&gt;Here are the points I think we should hit:&lt;br/&gt;
*) Relationship b/w db storage and working set&lt;br/&gt;
*) OS&apos;s LRU cache strategy&lt;br/&gt;
*) Impact of journaling&lt;br/&gt;
*) Using page faults and other MMS gauges to detect when you need more RAM&lt;br/&gt;
*) What is non-mapped memory? It&apos;s basically a linear function of connection count.&lt;br/&gt;
*) The oplog can be ignored when calculating working set (for some reason, that customer thought it was especially important when the opposite is true)&lt;/p&gt;</description>
                <environment></environment>
        <key id="49492">DOCS-491</key>
            <summary>Working-set calculation, RAM, oplog, non-mapped memory, and faults</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="9">Done</resolution>
                                        <assignee username="bgrabar">Bob Grabar</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Sep 2012 18:07:38 +0000</created>
                <updated>Mon, 30 Oct 2023 22:02:11 +0000</updated>
                            <resolved>Thu, 3 Jan 2013 17:32:36 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="231845" author="auto" created="Sat, 5 Jan 2013 15:18:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-05T15:17:39Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-491&quot; title=&quot;Working-set calculation, RAM, oplog, non-mapped memory, and faults&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-491&quot;&gt;&lt;del&gt;DOCS-491&lt;/del&gt;&lt;/a&gt; editing and organization&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/5395dd089582398f65a891f1f31e137da5e7e190&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/5395dd089582398f65a891f1f31e137da5e7e190&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="231844" author="auto" created="Sat, 5 Jan 2013 15:18:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-05T14:50:37Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: merge: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-491&quot; title=&quot;Working-set calculation, RAM, oplog, non-mapped memory, and faults&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-491&quot;&gt;&lt;del&gt;DOCS-491&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c7cd7b7573f6d0ac526fbe7095ecb18bb4df37bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c7cd7b7573f6d0ac526fbe7095ecb18bb4df37bd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="231843" author="auto" created="Sat, 5 Jan 2013 15:17:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-21T16:28:38Z&apos;, u&apos;email&apos;: u&apos;bob.grabar@10gen.com&apos;, u&apos;name&apos;: u&apos;Bob Grabar&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-491&quot; title=&quot;Working-set calculation, RAM, oplog, non-mapped memory, and faults&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-491&quot;&gt;&lt;del&gt;DOCS-491&lt;/del&gt;&lt;/a&gt; review edits&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/54b54d64d325bd827d93b6a98c5b6687ef798eda&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/54b54d64d325bd827d93b6a98c5b6687ef798eda&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="231842" author="auto" created="Sat, 5 Jan 2013 15:17:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-20T23:03:53Z&apos;, u&apos;email&apos;: u&apos;bob.grabar@10gen.com&apos;, u&apos;name&apos;: u&apos;Bob Grabar&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-491&quot; title=&quot;Working-set calculation, RAM, oplog, non-mapped memory, and faults&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-491&quot;&gt;&lt;del&gt;DOCS-491&lt;/del&gt;&lt;/a&gt; review edits&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/529f32c9a2f0c9a8f066873e2e4fb521f9020689&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/529f32c9a2f0c9a8f066873e2e4fb521f9020689&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="231841" author="auto" created="Sat, 5 Jan 2013 15:17:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-19T20:24:39Z&apos;, u&apos;email&apos;: u&apos;bob.grabar@10gen.com&apos;, u&apos;name&apos;: u&apos;Bob Grabar&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-491&quot; title=&quot;Working-set calculation, RAM, oplog, non-mapped memory, and faults&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-491&quot;&gt;&lt;del&gt;DOCS-491&lt;/del&gt;&lt;/a&gt; first draft&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/e54bc217a070102aaf517e046ed96c4095926e94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/e54bc217a070102aaf517e046ed96c4095926e94&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="231840" author="auto" created="Sat, 5 Jan 2013 15:17:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-19T19:52:36Z&apos;, u&apos;email&apos;: u&apos;bob.grabar@10gen.com&apos;, u&apos;name&apos;: u&apos;Bob Grabar&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-491&quot; title=&quot;Working-set calculation, RAM, oplog, non-mapped memory, and faults&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-491&quot;&gt;&lt;del&gt;DOCS-491&lt;/del&gt;&lt;/a&gt; memory faqs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/5cdac48c260f9320e2035f37fa616805f534c053&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/5cdac48c260f9320e2035f37fa616805f534c053&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="171445" author="samk" created="Thu, 4 Oct 2012 16:40:28 +0000"  >&lt;p&gt;Perhaps for a section for the crud documentation somewhere?&lt;/p&gt;</comment>
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