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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-3212] Description of &quot;page fault&quot; in mongostat and other places not totally clear</title>
                <link>https://jira.mongodb.org/browse/DOCS-3212</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The description of page fault as observed in mongostat and in serverStatus is not 100% clear and often leads O/S oriented people to misinterpret the meaning.    The docs glossary def inition of page fault is even less appropriate for the mongoDB meaning.  The description everywhere should always compare and contrast our page fault def to the more tradition def so that it is very very clear that our page faults do not necessarily imply a yellow flag for poor system performance or configuration.   The def should look something like this:&lt;/p&gt;

&lt;p&gt;page_fault:&lt;br/&gt;
Reports the total number of page faults in one second.&lt;br/&gt;
Do not confuse basic operating system / physical memory page&lt;br/&gt;
fault behavior with mongoDB page faults.  In basic operating system&lt;br/&gt;
parlance, page faults occur when physical memory is exhausted and pages of physical memory are swapped to disk.  In mongoDB, page faults occur when operations (both read AND write) access parts of the memory mapped files that are not currently available in physical memory.  The faults counter may increase dramatically during moments of poor performance and may correlate with limited physical memory environments and accessing much larger data sets (like scanning an entire collection).  Limited and sporadic page faults do not&lt;br/&gt;
necessarily indicate a problem or a need for tuning.&lt;/p&gt;</description>
                <environment>All</environment>
        <key id="131982">DOCS-3212</key>
            <summary>Description of &quot;page fault&quot; in mongostat and other places not totally clear</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="tim.slavin">Tim Slavin</assignee>
                                    <reporter username="buzz.moschetti">Buzz Moschetti</reporter>
                        <labels>
                            <label>sprint-rollover</label>
                    </labels>
                <created>Fri, 18 Apr 2014 14:48:12 +0000</created>
                <updated>Mon, 21 Jul 2014 16:59:38 +0000</updated>
                            <resolved>Wed, 9 Jul 2014 22:15:31 +0000</resolved>
                                                    <fixVersion>v1.3.8</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="665457" author="xgen-internal-githook" created="Mon, 21 Jul 2014 16:59:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;TimSlavinMongoDB&apos;, u&apos;name&apos;: u&apos;Tim Slavin (MongoDB)&apos;, u&apos;email&apos;: u&apos;tim.slavin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3212&quot; title=&quot;Description of &amp;quot;page fault&amp;quot; in mongostat and other places not totally clear&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3212&quot;&gt;&lt;del&gt;DOCS-3212&lt;/del&gt;&lt;/a&gt;: Define MongoDB page faults&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c0bf0e22100d8d2fc967afdb651c42338328c23e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c0bf0e22100d8d2fc967afdb651c42338328c23e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="654757" author="tim.slavin" created="Thu, 10 Jul 2014 13:52:38 +0000"  >&lt;p&gt;FYI does it matter this is Fixed but still open in Github?&lt;/p&gt;


&lt;p&gt;On Wed, Jul 9, 2014 at 6:15 PM, Sam Kleinman (JIRA) &amp;lt;jira@mongodb.org&amp;gt;&lt;/p&gt;
</comment>
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