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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-80760] Partition shared state on `ServiceContext`</title>
                <link>https://jira.mongodb.org/browse/SERVER-80760</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We maintain several shared data-structures on &lt;tt&gt;ServiceContext&lt;/tt&gt;. In particular, the following are modified as part of constructing and destroying instances of &lt;tt&gt;OperationContext&lt;/tt&gt;:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c19a106e916d41da9239df6e644fa652ff90cff8/src/mongo/db/service_context.h#L759&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unordered map&lt;/a&gt; that maps operation ids to clients, and a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c19a106e916d41da9239df6e644fa652ff90cff8/src/mongo/db/service_context.h#L757&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mutex&lt;/a&gt; that synchronizes accesses to this data structure.&lt;/li&gt;
	&lt;li&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c19a106e916d41da9239df6e644fa652ff90cff8/src/mongo/db/service_context.h#L758&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;registry&lt;/a&gt; that allows checking out unique operation ids.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Sharing these across many cores result in frequent cache-line evictions and performance regressions (see PERF-4626 for detailed analysis and a PoC that measures potential gains from partitioning these structures).&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2434554">SERVER-80760</key>
            <summary>Partition shared state on `ServiceContext`</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                            <label>perf-8.0</label>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
                            <label>perf-tiger-project-candidates</label>
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                <created>Tue, 5 Sep 2023 19:29:00 +0000</created>
                <updated>Wed, 24 Jan 2024 22:59:27 +0000</updated>
                                                                            <component>Internal Code</component>
                                        <votes>0</votes>
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