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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-21542] Optimize SpinLock to use std::atomic_flag rather than pthread_spin_lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-21542</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Buys 2-5% perf wins on linux. No change will be made to the windows implementation of SpinLock in this work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="240115">SERVER-21542</key>
            <summary>Optimize SpinLock to use std::atomic_flag rather than pthread_spin_lock</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Nov 2015 23:10:32 +0000</created>
                <updated>Wed, 25 Nov 2015 00:27:05 +0000</updated>
                            <resolved>Wed, 18 Nov 2015 23:22:51 +0000</resolved>
                                                    <fixVersion>3.2.0-rc4</fixVersion>
                                    <component>Internal Code</component>
                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1092974" author="xgen-internal-githook" created="Thu, 19 Nov 2015 14:54:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21542&quot; title=&quot;Optimize SpinLock to use std::atomic_flag rather than pthread_spin_lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21542&quot;&gt;&lt;del&gt;SERVER-21542&lt;/del&gt;&lt;/a&gt; Optimize spinlock on non-windows systems&lt;/p&gt;

&lt;p&gt;This reverts commit 30458a9c6160b01925a8bdd768deb98ed8da8cb0.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f598f1edc57ca0b863b58009e7cca9a986d4da7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f598f1edc57ca0b863b58009e7cca9a986d4da7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1092965" author="xgen-internal-githook" created="Thu, 19 Nov 2015 14:50:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21542&quot; title=&quot;Optimize SpinLock to use std::atomic_flag rather than pthread_spin_lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21542&quot;&gt;&lt;del&gt;SERVER-21542&lt;/del&gt;&lt;/a&gt; Optimize spinlock on non-windows systems&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 18600ed909f739ab1bc3032c2a230aeac1abe1c2.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/30458a9c6160b01925a8bdd768deb98ed8da8cb0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/30458a9c6160b01925a8bdd768deb98ed8da8cb0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1092926" author="xgen-internal-githook" created="Thu, 19 Nov 2015 14:37:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21542&quot; title=&quot;Optimize SpinLock to use std::atomic_flag rather than pthread_spin_lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21542&quot;&gt;&lt;del&gt;SERVER-21542&lt;/del&gt;&lt;/a&gt; replace non-standard pthread_yield with standardized sched_yield&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/042d8fa2d252142489c5fa3009927bad20d77efb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/042d8fa2d252142489c5fa3009927bad20d77efb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1092409" author="xgen-internal-githook" created="Wed, 18 Nov 2015 23:19:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21542&quot; title=&quot;Optimize SpinLock to use std::atomic_flag rather than pthread_spin_lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21542&quot;&gt;&lt;del&gt;SERVER-21542&lt;/del&gt;&lt;/a&gt; Optimize spinlock on non-windows systems&lt;/p&gt;

&lt;p&gt;Now uses std::atomic_flag rather than pthread_spinlock.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/18600ed909f739ab1bc3032c2a230aeac1abe1c2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/18600ed909f739ab1bc3032c2a230aeac1abe1c2&lt;/a&gt;&lt;/p&gt;</comment>
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