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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-13271] Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter</title>
                <link>https://jira.mongodb.org/browse/DOCS-13271</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Should be added to &lt;a href=&quot;https://docs.mongodb.com/manual/reference/parameters/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/parameters/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Text from &lt;a href=&quot;https://gperftools.github.io/gperftools/tcmalloc.html#runtime:&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gperftools.github.io/gperftools/tcmalloc.html#runtime:&lt;/a&gt; &quot;Rate at which tcmalloc releases unused memory to the system. Zero means it never release memory back to the system. Increase this flag to return memory faster; decrease it to return memory slower. Reasonable rates are in the range &lt;span class=&quot;error&quot;&gt;&amp;#91;0.0,10.0&amp;#93;&lt;/span&gt;. &quot;&lt;/p&gt;

&lt;p&gt;(Default is 1)&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    &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; exposed tcmalloc_aggressive_decommit via the setParameter framework. This has turned out to be not very useful, as aggressive decommit comes with a huge performance penalty. (-75% in a small YCSB workload.)&lt;/p&gt;

&lt;p&gt;We recently found that tcmalloc_release_rate can be used to reduce memory overhead, with little or no performance overhead. We should add a setParameter knob to do this at runtime too.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://gperftools.github.io/gperftools/tcmalloc.html#runtime&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Relevant tcmalloc documentation&lt;/a&gt;&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1041819">DOCS-13271</key>
            <summary>Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Dec 2019 14:01:37 +0000</created>
                <updated>Mon, 13 Nov 2023 18:12:53 +0000</updated>
                            <resolved>Tue, 17 Dec 2019 13:50:59 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                    <fixVersion>4.2.3</fixVersion>
                    <fixVersion>3.6.18</fixVersion>
                    <fixVersion>4.0.18</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2767079" author="xgen-internal-githook" created="Tue, 28 Jan 2020 00:38:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13271&quot; title=&quot;Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13271&quot;&gt;&lt;del&gt;DOCS-13271&lt;/del&gt;&lt;/a&gt;: tcmallocreleaserate parameter&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/684bf20e734292a25ff8a01e803bce9fdd9a1b20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/684bf20e734292a25ff8a01e803bce9fdd9a1b20&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2767076" author="xgen-internal-githook" created="Tue, 28 Jan 2020 00:37:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;name&apos;: &apos;Kay Kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13271&quot; title=&quot;Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13271&quot;&gt;&lt;del&gt;DOCS-13271&lt;/del&gt;&lt;/a&gt;: tcmallocreleaserate parameter&lt;br/&gt;
Branch: v3.6.17&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/fa6401bcd83c19849a6bd497c82fa3925dced459&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/fa6401bcd83c19849a6bd497c82fa3925dced459&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2644179" author="xgen-internal-githook" created="Wed, 18 Dec 2019 19:44:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13271&quot; title=&quot;Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13271&quot;&gt;&lt;del&gt;DOCS-13271&lt;/del&gt;&lt;/a&gt;: tcmallocreleaserate parameter&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/5a186bd9490049821ddbd8866881a1878bd2bf75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/5a186bd9490049821ddbd8866881a1878bd2bf75&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2638312" author="xgen-internal-githook" created="Tue, 17 Dec 2019 18:32:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13271&quot; title=&quot;Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13271&quot;&gt;&lt;del&gt;DOCS-13271&lt;/del&gt;&lt;/a&gt;: tcmallocreleaserate parameter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/703418c3d7c3f8a5938368be6dfb4fcb2d3fe190&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/703418c3d7c3f8a5938368be6dfb4fcb2d3fe190&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2636177" author="xgen-internal-githook" created="Tue, 17 Dec 2019 13:48:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13271&quot; title=&quot;Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13271&quot;&gt;&lt;del&gt;DOCS-13271&lt;/del&gt;&lt;/a&gt;: tcmallocreleaserate parameter&lt;br/&gt;
Branch: v3.6.17&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/53148c0226ce44605f84ffdc1d13d34bbb80031b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/53148c0226ce44605f84ffdc1d13d34bbb80031b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2636174" author="xgen-internal-githook" created="Tue, 17 Dec 2019 13:46:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13271&quot; title=&quot;Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13271&quot;&gt;&lt;del&gt;DOCS-13271&lt;/del&gt;&lt;/a&gt;: tcmallocreleaserate parameter&lt;br/&gt;
Branch: v4.0.14&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/01750eddabe2ed5596ca2c3facaede490de80506&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/01750eddabe2ed5596ca2c3facaede490de80506&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2636172" author="xgen-internal-githook" created="Tue, 17 Dec 2019 13:44:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13271&quot; title=&quot;Investigate changes in SERVER-42697: Expose tcmalloc_release_rate via setParameter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13271&quot;&gt;&lt;del&gt;DOCS-13271&lt;/del&gt;&lt;/a&gt;: tcmallocreleaserate parameter&lt;br/&gt;
Branch: v4.2.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/79be5f8af415454e67332c3f5c342efcab7e42ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/79be5f8af415454e67332c3f5c342efcab7e42ea&lt;/a&gt;&lt;/p&gt;</comment>
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