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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-82646] Split the lock in Top class into two</title>
                <link>https://jira.mongodb.org/browse/SERVER-82646</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the Top class, there is one lock that guards the global histogram metrics and the per collection statistics. These metrics are updated by separate methods and at different times during a query&lt;/p&gt;

&lt;p&gt;Since these two pieces of the Top class are independent, they could be guarded by two different locks instead of one lock. This will reduce cache line and atomic concurrency.&lt;/p&gt;

&lt;p&gt;POC: &lt;a href=&quot;https://github.com/10gen/mongo/commit/3c3d7ae8ec93db1ebbb3da3f97f57235c71f5f1e#diff-966f199e499eb2a33268c3e408a24e1477608de7e4d0109641f6fadb31f12d2a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/3c3d7ae8ec93db1ebbb3da3f97f57235c71f5f1e#diff-966f199e499eb2a33268c3e408a24e1477608de7e4d0109641f6fadb31f12d2a&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2487357">SERVER-82646</key>
            <summary>Split the lock in Top class into two</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="erin.mcnulty@mongodb.com">Erin McNulty</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                            <label>perf-8.0</label>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
                            <label>perf-tiger-poc</label>
                            <label>perf-tiger-q4</label>
                    </labels>
                <created>Wed, 1 Nov 2023 00:14:36 +0000</created>
                <updated>Wed, 24 Jan 2024 22:50:54 +0000</updated>
                            <resolved>Fri, 10 Nov 2023 19:34:17 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5872031" author="xgen-internal-githook" created="Fri, 10 Nov 2023 19:28:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Erin McNulty&apos;, &apos;email&apos;: &apos;erin.mcnulty@mongodb.com&apos;, &apos;username&apos;: &apos;erin2722&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82646&quot; title=&quot;Split the lock in Top class into two&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82646&quot;&gt;&lt;del&gt;SERVER-82646&lt;/del&gt;&lt;/a&gt;: Split the lock in Top class into two&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/191fd4c8e3417ffa0a31f9e689611d7a4c64d18b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/191fd4c8e3417ffa0a31f9e689611d7a4c64d18b&lt;/a&gt;&lt;/p&gt;</comment>
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