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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68081] Investigate performance regression when using shared buffers in RecordId</title>
                <link>https://jira.mongodb.org/browse/SERVER-68081</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the work done on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67471&quot; title=&quot;Improve RecordId performance during index build&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67471&quot;&gt;&lt;del&gt;SERVER-67471&lt;/del&gt;&lt;/a&gt; we realised that swapping the Shared Buffer with a unique buffer manually managed by RecordId yielded significant performance improvements even if the branching itself wasn&apos;t taken.&lt;/p&gt;

&lt;p&gt;This task is about investigating why this is the case and to see if we can go back to the old behaviour while maintaining the performance characteristics.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2091164">SERVER-68081</key>
            <summary>Investigate performance regression when using shared buffers in RecordId</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="13203">Gone away</resolution>
                                        <assignee username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Jul 2022 11:46:25 +0000</created>
                <updated>Fri, 27 Oct 2023 20:45:20 +0000</updated>
                            <resolved>Wed, 28 Sep 2022 08:46:56 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4860957" author="JIRAUSER1264163" created="Wed, 28 Sep 2022 08:52:03 +0000"  >&lt;p&gt;The conclusion of the investigation is that the regression seen (and fixed) in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67471&quot; title=&quot;Improve RecordId performance during index build&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67471&quot;&gt;&lt;del&gt;SERVER-67471&lt;/del&gt;&lt;/a&gt; is contained only to the particular CPU model used in internal benchmarks.&lt;/p&gt;

&lt;p&gt;This regression does not happen in more recent CPU models from Intel (Ice Lake and above) nor in AWS Graviton2 instances.&lt;/p&gt;</comment>
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                            <attachment id="402175" name="reproducer.patch" size="4405" author="jordi.olivares-provencio@mongodb.com" created="Thu, 15 Sep 2022 15:47:46 +0000"/>
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