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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21558] Add evergreen variant that uses a single core</title>
                <link>https://jira.mongodb.org/browse/SERVER-21558</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We can add a variant in Evergreen that runs all processes started by a test (including other MongoDB processes) with affinity for a single processor. This can help to reveal timing dependencies within tests by starving the test of CPU resources.&lt;/p&gt;

&lt;p&gt;One option is use &lt;a href=&quot;http://man7.org/linux/man-pages/man1/taskset.1.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the &lt;tt&gt;taskset&lt;/tt&gt; utility&lt;/a&gt; within resmoke.py on the processes it spawns. Another option is to use &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc4/etc/perf.yml#L549-L550&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;numactl &amp;#45;&amp;#45;physcpubind&lt;/tt&gt; like the perf project does&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Note&lt;/b&gt;: The CPU affinity is inherited by child processes.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;A child created via fork(2) inherits its parent&apos;s CPU affinity mask. The affinity mask is preserved across an execve(2).&lt;/p&gt;

&lt;p&gt;&amp;#45;&amp;#45; &lt;a href=&quot;http://man7.org/linux/man-pages/man2/sched_setaffinity.2.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://man7.org/linux/man-pages/man2/sched_setaffinity.2.html&lt;/a&gt;&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="240232">SERVER-21558</key>
            <summary>Add evergreen variant that uses a single core</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-stm">Backlog - Server Tooling and Methods (STM)</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>PM424</label>
                            <label>stm</label>
                            <label>tig-evgconfig</label>
                    </labels>
                <created>Thu, 19 Nov 2015 16:16:24 +0000</created>
                <updated>Tue, 6 Dec 2022 04:39:29 +0000</updated>
                            <resolved>Fri, 19 Nov 2021 20:33:18 +0000</resolved>
                                                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1093114" author="scotthernandez" created="Thu, 19 Nov 2015 16:21:38 +0000"  >&lt;p&gt;The goal of this is to make the cpu a highly contended resource as if there was only one core on the system, which we don&apos;t have anymore in our hardware options.&lt;/p&gt;</comment>
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