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    <title>MongoDB Jira</title>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20668] Index hash map outside of the lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-20668</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Things like Top use a global lock to index into a hash map and increment two counters - most of the work inside that lock is doing the hash calculation, and removing it gives us 10% more perf on insert (writecmd path, 32 threads)&lt;/p&gt;

&lt;p&gt;So we believe that doing the hash calc outside the lock would be a significant performance boost for every operation for larger servers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="231802">SERVER-20668</key>
            <summary>Index hash map outside of the lock</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="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="martin.bligh">Martin Bligh</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Sep 2015 18:14:10 +0000</created>
                <updated>Thu, 15 Oct 2015 19:08:20 +0000</updated>
                            <resolved>Thu, 8 Oct 2015 16:14:35 +0000</resolved>
                                                    <fixVersion>3.2.0-rc0</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1055544" author="xgen-internal-githook" created="Thu, 8 Oct 2015 16:13:57 +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-20668&quot; title=&quot;Index hash map outside of the lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20668&quot;&gt;&lt;del&gt;SERVER-20668&lt;/del&gt;&lt;/a&gt; Support prehashing StringMap keys&lt;/p&gt;

&lt;p&gt;This allows computing the hash outside of a mutex guarding the StringMap.&lt;br/&gt;
This commit applies this optimization in Top::record().&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/804ad14001e1a58538974a327e9943c338fd0925&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/804ad14001e1a58538974a327e9943c338fd0925&lt;/a&gt;&lt;/p&gt;</comment>
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