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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-23069] Improve tcmalloc freelist statistics</title>
                <link>https://jira.mongodb.org/browse/SERVER-23069</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;TCMalloc doesn&apos;t give detailed statistics on the state of the freelist, which makes it difficult to analyze severe memory fragmentations like those in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22906&quot; title=&quot;MongoD uses excessive memory over and above the WiredTiger cache size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22906&quot;&gt;&lt;del&gt;SERVER-22906&lt;/del&gt;&lt;/a&gt; or &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20306&quot; title=&quot;75% excess memory usage under WiredTiger during stress test&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20306&quot;&gt;&lt;del&gt;SERVER-20306&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Improve the TCMalloc serverStatus() output by traversing the freelists for the different size classes, giving us more information. Add a new function in TCMalloc that exposes these statistics &lt;b&gt;efficiently&lt;/b&gt;, allowing us to create a BSON object out of them rather than returning a text blob that cannot be parsed.&lt;/p&gt;


&lt;p&gt;See also: &lt;a href=&quot;https://github.com/gperftools/gperftools/issues/727&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/gperftools/gperftools/issues/727&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="271585">SERVER-23069</key>
            <summary>Improve tcmalloc freelist statistics</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Thu, 10 Mar 2016 20:32:46 +0000</created>
                <updated>Sun, 20 Nov 2016 22:37:29 +0000</updated>
                            <resolved>Fri, 25 Mar 2016 15:59:22 +0000</resolved>
                                    <version>3.3.2</version>
                                    <fixVersion>3.2.9</fixVersion>
                    <fixVersion>3.3.4</fixVersion>
                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1327039" author="xgen-internal-githook" created="Mon, 18 Jul 2016 15:21:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;ksuarz@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23069&quot; title=&quot;Improve tcmalloc freelist statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23069&quot;&gt;&lt;del&gt;SERVER-23069&lt;/del&gt;&lt;/a&gt; improve tcmalloc freelist stats&lt;/p&gt;

&lt;p&gt;Walks the size classes in TCMalloc&apos;s central freelist, exposing interesting&lt;br/&gt;
statistics via a callback.&lt;/p&gt;

&lt;p&gt;serverStatus() now includes this information in lieu of the TCMalloc dump stats&lt;br/&gt;
text block.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a1d9d2251734bc4077255ae33e17f5a210697839)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/475099387db16d73f5113aa7ef6b28e5e71bc3f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/475099387db16d73f5113aa7ef6b28e5e71bc3f9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1215348" author="xgen-internal-githook" created="Fri, 25 Mar 2016 15:58:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;ksuarz@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23069&quot; title=&quot;Improve tcmalloc freelist statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23069&quot;&gt;&lt;del&gt;SERVER-23069&lt;/del&gt;&lt;/a&gt; improve tcmalloc freelist stats&lt;/p&gt;

&lt;p&gt;Walks the size classes in TCMalloc&apos;s central freelist, exposing interesting&lt;br/&gt;
statistics via a callback.&lt;/p&gt;

&lt;p&gt;serverStatus() now includes this information in lieu of the TCMalloc dump stats&lt;br/&gt;
text block.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a1d9d2251734bc4077255ae33e17f5a210697839&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a1d9d2251734bc4077255ae33e17f5a210697839&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1215346" author="xgen-internal-githook" created="Fri, 25 Mar 2016 15:57:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;ksuarz@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23069&quot; title=&quot;Improve tcmalloc freelist statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23069&quot;&gt;&lt;del&gt;SERVER-23069&lt;/del&gt;&lt;/a&gt; improve tcmalloc freelist stats&lt;/p&gt;

&lt;p&gt;Walks the size classes in TCMalloc&apos;s central freelist, exposing interesting&lt;br/&gt;
statistics via a callback.&lt;/p&gt;

&lt;p&gt;serverStatus() now includes this information in lieu of the TCMalloc dump stats&lt;br/&gt;
text block.&lt;br/&gt;
Branch: memstats&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a1d9d2251734bc4077255ae33e17f5a210697839&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a1d9d2251734bc4077255ae33e17f5a210697839&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1213758" author="kyle.suarez" created="Thu, 24 Mar 2016 14:30:15 +0000"  >&lt;p&gt;Pull request upstream to gperftools: &lt;a href=&quot;https://github.com/gperftools/gperftools/pull/785&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/gperftools/gperftools/pull/785&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="278136">SERVER-23594</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="269053">SERVER-22906</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="228592">SERVER-20306</issuekey>
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