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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-75867] Performance experiment: Use fetchAndAddRelaxed for Mutex diagnostic counters</title>
                <link>https://jira.mongodb.org/browse/SERVER-75867</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the BF-28130 performance investigation, we noticed that approximately 3.1% of execution time is spent inside &lt;tt&gt;Mutex::_onQuickLock&lt;/tt&gt;, &lt;tt&gt;Mutex::_onUnlock&lt;/tt&gt;, and similar methods. These functions don&apos;t actually perform any locking or unlocking, they just increment the counters used for latch analysis and call diagnostic listeners. The counters are only written to in these methods, using &lt;tt&gt;fetchAndAdd()&lt;/tt&gt;, and they&apos;re only read in one place in code (inside &lt;tt&gt;LatchAnalyzer&lt;/tt&gt;) using &lt;tt&gt;loadRelaxed()&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to do preliminary performance testing to check whether replacing these &lt;tt&gt;fetchAndAdd()&lt;/tt&gt; calls with &lt;tt&gt;fetchAndAddRelaxed()&lt;/tt&gt; would yield any performance improvements.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2310019">SERVER-75867</key>
            <summary>Performance experiment: Use fetchAndAddRelaxed for Mutex diagnostic counters</summary>
                <type id="17000" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14713&amp;avatarType=issuetype">Engineering Test</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="alex.li@mongodb.com">Alex Li</assignee>
                                    <reporter username="vojislav.stojkovic@mongodb.com">Vojislav Stojkovic</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Apr 2023 22:29:54 +0000</created>
                <updated>Tue, 18 Apr 2023 17:10:48 +0000</updated>
                            <resolved>Tue, 18 Apr 2023 17:10:48 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
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                            <attachment id="442440" name="SERVER-75867.csv" size="11948" author="alex.li@mongodb.com" created="Wed, 12 Apr 2023 12:55:57 +0000"/>
                            <attachment id="443212" name="image-2023-04-17-01-11-58-554.png" size="48318" author="vojislav.stojkovic@mongodb.com" created="Mon, 17 Apr 2023 08:11:58 +0000"/>
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