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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-3433] Command to report %-in memory per namespace</title>
                <link>https://jira.mongodb.org/browse/SERVER-3433</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add a command which can report the % of the namespace (for both the data and all indexes related to a collection) which is currently in (mapped-resident/cache) memory. This can be added for reporting cache/memory efficiency and for debugging performance issues.&lt;/p&gt;

&lt;p&gt;It could be called something like &lt;/p&gt;
{cacheStats: &amp;lt;ns&amp;gt;}
&lt;p&gt; and report something like this:&lt;br/&gt;
{cacheStats: [&lt;br/&gt;
     {&amp;lt;ns&amp;gt;:&lt;/p&gt;
               { percent: 20, 
                 graph: &quot;XXXXXXX___0000_____XXXXXX...&quot;
                     ]}

&lt;p&gt;Where percent is the percent in memory of the namespace, and a graphic (textual) representation shows which parts of the namespace are in memory.&lt;/p&gt;


&lt;p&gt;Or a distribution is the number of the contiguous page blocks (which could tell you if you are accessing data randomly or in ranges, and should be cheap to calculate as you are walking pages ~ mincore). &lt;br/&gt;
distribution: [&lt;br/&gt;
                        4: 20000&lt;br/&gt;
                        25: 60&lt;br/&gt;
                        300: 4&lt;br/&gt;
                        ...&lt;br/&gt;
                              ]}}&lt;/p&gt;</description>
                <environment></environment>
        <key id="19633">SERVER-3433</key>
            <summary>Command to report %-in memory per namespace</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>caching</label>
                            <label>memory</label>
                            <label>mincore</label>
                    </labels>
                <created>Fri, 15 Jul 2011 20:28:43 +0000</created>
                <updated>Tue, 6 Dec 2022 05:42:12 +0000</updated>
                            <resolved>Tue, 18 Dec 2018 20:10:18 +0000</resolved>
                                                                    <component>Admin</component>
                    <component>Performance</component>
                                        <votes>4</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="215428" author="adamaflynn" created="Fri, 14 Dec 2012 23:08:34 +0000"  >&lt;p&gt;We built a tool to do something like this. Doesn&apos;t give distribution within a collection, but it&apos;ll tell you how much of each collection is currently in cache.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://eng.wish.com/mongomem-memory-usage-by-collection-in-mongodb/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://eng.wish.com/mongomem-memory-usage-by-collection-in-mongodb/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="174897" author="kamaradclimber" created="Mon, 15 Oct 2012 15:21:37 +0000"  >&lt;p&gt;this would be great to understand the reason of page faults&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                                                <inwardlinks description="is duplicated by">
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            <issuekey id="77380">SERVER-9829</issuekey>
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                            <issuelinktype id="10012">
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                                        <issuelink>
            <issuekey id="67932">SERVER-8927</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="17151">SERVER-3109</issuekey>
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