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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-24219] Make AlignedLockStats alignment respect platform specific cache lines</title>
                <link>https://jira.mongodb.org/browse/SERVER-24219</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Cache line sizes vary by platform, and specific processors.&lt;/p&gt;

&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Processor Family&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Cache Line Size&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;x64&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;64&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;PowerPC64&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;128&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;s390x&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;256&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
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&lt;p&gt;For PowerPC64, I am considering POWER8 instead of older processors.&lt;/p&gt;

&lt;p&gt;An case where we try to align to cache line size: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/concurrency/lock_state.cpp#L90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/concurrency/lock_state.cpp#L90&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="288039">SERVER-24219</key>
            <summary>Make AlignedLockStats alignment respect platform specific cache lines</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="9">Done</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                            <label>platforms-re-triaged</label>
                    </labels>
                <created>Thu, 19 May 2016 19:45:29 +0000</created>
                <updated>Wed, 6 Dec 2017 21:09:52 +0000</updated>
                            <resolved>Thu, 29 Jun 2017 12:36:24 +0000</resolved>
                                    <version>3.3.6</version>
                                    <fixVersion>3.5.10</fixVersion>
                                    <component>Portability</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1610272" author="xgen-internal-githook" created="Thu, 29 Jun 2017 12:35:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24219&quot; title=&quot;Make AlignedLockStats alignment respect platform specific cache lines&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24219&quot;&gt;&lt;del&gt;SERVER-24219&lt;/del&gt;&lt;/a&gt; Make AlignedLockStats respect cache line size&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/943ede3296b190c97fe6ae53f7b718de22cd074d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/943ede3296b190c97fe6ae53f7b718de22cd074d&lt;/a&gt;&lt;/p&gt;</comment>
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