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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-42051] Investigate the bottleneck of majority writes by many clients</title>
                <link>https://jira.mongodb.org/browse/SERVER-42051</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40250&quot; title=&quot;High contention for ReplicationCoordinatorImpl::_mutex in w:majority workloads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40250&quot;&gt;&lt;del&gt;SERVER-40250&lt;/del&gt;&lt;/a&gt; showed the high contention on the same mutex under heavy concurrent w:majority writes. The user reported 7% CPU usage with 256 threads inserting small documents on a 16-core machine. The bottleneck was _wakeReadyWaiters_inlock which implements a naive O(N) algorithm to examine waiters, where N is the total number of all pending and ready waiters.&#160;&lt;/p&gt;

&lt;p&gt;We need to verify the bottleneck in a 2-node or 3-node replica set and add Genny test to evergreen.&lt;/p&gt;</description>
                <environment></environment>
        <key id="832918">SERVER-42051</key>
            <summary>Investigate the bottleneck of majority writes by many clients</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="9">Done</resolution>
                                        <assignee username="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
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                <created>Tue, 2 Jul 2019 18:27:24 +0000</created>
                <updated>Thu, 12 Sep 2019 18:36:10 +0000</updated>
                            <resolved>Thu, 12 Sep 2019 18:36:10 +0000</resolved>
                                                                    <component>Replication</component>
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