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    <description>This file is an XML representation of an issue</description>
    <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-82612] Use all available CPU cores for scons in compilation tasks </title>
                <link>https://jira.mongodb.org/browse/SERVER-82612</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we use &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a8246a3d2b2974207db947a005a2994c7d3fdf9a/etc/expansions.default.yml#L37-L38&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;two evergreen global expansion variables&lt;/a&gt; to limit the amount the number of CPU cores SCons will use in compile tasks. In particular:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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&lt;p/&gt;

&lt;p&gt;We only use 25% of available cores for link jobs and 75% for cc jobs.&lt;/p&gt;


&lt;p&gt;I run a patch with those two variables set to 1 and all compile tasks in all variants simply succeeded without issues.&lt;/p&gt;

&lt;p&gt;I think that rather than limiting by default the number of cores, we should instead use all cores by default and cap the number of jobs only in the variants that hit Out of memory limit. (e.g. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a8246a3d2b2974207db947a005a2994c7d3fdf9a/etc/evergreen.yml#L2721C5-L2721C37&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;)&lt;/p&gt;</description>
                <environment></environment>
        <key id="2486337">SERVER-82612</key>
            <summary>Use all available CPU cores for scons in compilation tasks </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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Oct 2023 10:28:09 +0000</created>
                <updated>Fri, 2 Feb 2024 20:46:44 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5840214" author="tommaso.tocci" created="Tue, 31 Oct 2023 10:30:43 +0000"  >&lt;p&gt;I did &lt;a href=&quot;https://docs.google.com/spreadsheets/u/0/d/e/2PACX-1vRVZM2InSP8dniR4zAu8o22KHO_kj0SsDmieLmoYQp7R6cg1CcyjT8nZRs1W-h_JN7yfcjAIbVwXh-X/pubhtml?gid=302460157&amp;amp;single=true&amp;amp;skip_itp2_check=true&amp;amp;pli=1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;some experiments that shows how changing those two global default variables to 1 can bring up to 40% execution time improvements&lt;/a&gt; for compile tasks.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2272546">SERVER-74287</issuekey>
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