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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-16829] Expose tcmalloc runtime configuration options through setParameter mechanism</title>
                <link>https://jira.mongodb.org/browse/SERVER-16829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16551&quot; title=&quot;tcmalloc ReleaseToCentralCache account &amp;gt; 14% usage with long insert traffic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16551&quot;&gt;&lt;del&gt;SERVER-16551&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16517&quot; title=&quot;Secondary on 2.8.0rc2 cannot keep up (insert-heavy, mmapv1) (mms-prod-queues)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16517&quot;&gt;&lt;del&gt;SERVER-16517&lt;/del&gt;&lt;/a&gt; both indicate that for many mongodb workloads, the default cap on the size of all per-thread caches imposed by tcmalloc is too low.  We should raise the cap, and expose an option to allow the administrator to tune it at start-up and runtime.&lt;/p&gt;

&lt;p&gt;Specifically, mongod should present the tcmalloc property &lt;tt&gt;tcmalloc.max_total_thread_cache_bytes&lt;/tt&gt; via a &lt;tt&gt;tcmallocMaxTotalThreadCacheBytes&lt;/tt&gt; argument to setParameter, and &lt;tt&gt;tcmalloc.aggressive_memory_decommit&lt;/tt&gt; via &lt;tt&gt;tcmallocAggressiveMemoryDecommit&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="178519">SERVER-16829</key>
            <summary>Expose tcmalloc runtime configuration options through setParameter mechanism</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Jan 2015 20:27:11 +0000</created>
                <updated>Mon, 13 Sep 2021 20:29:33 +0000</updated>
                            <resolved>Tue, 13 Jan 2015 22:41:36 +0000</resolved>
                                                    <fixVersion>2.8.0-rc5</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="803823" author="xgen-internal-githook" created="Tue, 13 Jan 2015 22:40:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16829&quot; title=&quot;Expose tcmalloc runtime configuration options through setParameter mechanism&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16829&quot;&gt;&lt;del&gt;SERVER-16829&lt;/del&gt;&lt;/a&gt; Expose tcmalloc configuration options for per-thread cache size and decommit behavior.&lt;/p&gt;

&lt;p&gt;Also, increases the default cap on the sum of all per-thread cache sizes from&lt;br/&gt;
32MB to 64MB, as advised by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16551&quot; title=&quot;tcmalloc ReleaseToCentralCache account &amp;gt; 14% usage with long insert traffic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16551&quot;&gt;&lt;del&gt;SERVER-16551&lt;/del&gt;&lt;/a&gt;.  Should improve behavior of&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16517&quot; title=&quot;Secondary on 2.8.0rc2 cannot keep up (insert-heavy, mmapv1) (mms-prod-queues)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16517&quot;&gt;&lt;del&gt;SERVER-16517&lt;/del&gt;&lt;/a&gt;, as well.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a6ca16f211fe01d2870593d9ab9bfaaa88097a14&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a6ca16f211fe01d2870593d9ab9bfaaa88097a14&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="545602">SERVER-35046</issuekey>
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                            <issuelinktype id="10012">
                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="181383">SERVER-17105</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="887211">SERVER-42697</issuekey>
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