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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-64465] Investigate and improve the negative scaling at high-concurrency levels for FIFO ticketholder</title>
                <link>https://jira.mongodb.org/browse/SERVER-64465</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the work on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64076&quot; title=&quot;Fix deadlock when waiting for tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64076&quot;&gt;&lt;del&gt;SERVER-64076&lt;/del&gt;&lt;/a&gt; we&apos;ve identified that at high load cases our system doesn&apos;t scale as well as with the previous semaphore based implementation. In particular, as soon as we begin enqueueing requests there&apos;s a drop in performance.&lt;/p&gt;

&lt;p&gt;This ticket&apos;s scope is thus to investigate why this is the case and if possible to mitigate it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2000326">SERVER-64465</key>
            <summary>Investigate and improve the negative scaling at high-concurrency levels for FIFO ticketholder</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Mar 2022 11:12:10 +0000</created>
                <updated>Tue, 3 May 2022 14:42:09 +0000</updated>
                            <resolved>Tue, 3 May 2022 14:42:09 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4412196" author="JIRAUSER1264163" created="Tue, 15 Mar 2022 09:25:04 +0000"  >&lt;p&gt;A cursory investigation to the drop-off in acquisitions leads to the &lt;tt&gt;_queueMutex&lt;/tt&gt; being extremely contended with a high number of threads. If possible, work should be devoted to investigating how to remove contingency on it or to remove it entirely altogether.&lt;/p&gt;</comment>
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