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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-27927] Maximum thread cache byte limit should change based on number of connections</title>
                <link>https://jira.mongodb.org/browse/SERVER-27927</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, a mongos instance will attempt to cleanup memory from a thread&apos;s cache during threadStateChange() if the thread&apos;s cache size is larger than 10,000 bytes.  This number was chosen heuristically based on having no more than 1,000 clients connected to a mongos instance.  If there are more than 1,000 clients, then the cleanup code is run far more often.  This is also problematic as the mongos logs a debug message every time the cleanup is performed.&lt;/p&gt;

&lt;p&gt;The suggested improvement is to adjust the maximum thread cache size value based on the number of currently active client connections.&lt;/p&gt;

&lt;p&gt;The code that this change relates to is located in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.2/src/mongo/util/tcmalloc_server_status_section.cpp#L68-L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.4.2/src/mongo/util/tcmalloc_server_status_section.cpp#L68-L86&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="352056">SERVER-27927</key>
            <summary>Maximum thread cache byte limit should change based on number of connections</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="13202">Works as Designed</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="andrew.young">Andrew Young</reporter>
                        <labels>
                            <label>tcmalloc</label>
                    </labels>
                <created>Mon, 6 Feb 2017 20:10:20 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:35 +0000</updated>
                            <resolved>Mon, 18 Dec 2017 19:20:40 +0000</resolved>
                                    <version>3.4.2</version>
                    <version>3.5.2</version>
                                                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1754850" author="mark.benvenuto" created="Mon, 18 Dec 2017 19:20:40 +0000"  >&lt;p&gt;TCMalloc already dynamically adjusts the individual thread sizes, and ensures a minimum of 512KB per thread. There are not plans to adjust the thread cache based on the number of threads in MongoDB.&lt;/p&gt;

&lt;p&gt;In 3.6, we have disabled markThreadIdle by default so the messages will not be logged.&lt;/p&gt;</comment>
                            <comment id="1493268" author="milkie" created="Mon, 6 Feb 2017 20:54:57 +0000"  >&lt;p&gt;We should also consider calling BecomeTemporarilyIdle(), which was added recently to TCMalloc and is intended to do what we need here, rather than calling MarkThreadIdle() and MarkThreadBusy().&lt;/p&gt;</comment>
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