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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-16050] Frequent yielding/sleeping causes bad perf in collscan</title>
                <link>https://jira.mongodb.org/browse/SERVER-16050</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Just querying for &lt;/p&gt;
{x:1}
&lt;p&gt; in a database with a few thousand small records is 55% slower due to yielding after every 128 documents scanned. Part of the slowness is due to yielding after read doing a sleep.&lt;/p&gt;</description>
                <environment></environment>
        <key id="168242">SERVER-16050</key>
            <summary>Frequent yielding/sleeping causes bad perf in collscan</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Nov 2014 17:20:29 +0000</created>
                <updated>Wed, 3 Dec 2014 21:46:23 +0000</updated>
                            <resolved>Mon, 10 Nov 2014 18:55:07 +0000</resolved>
                                                    <fixVersion>2.8.0-rc0</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="760370" author="geert.bosch" created="Mon, 10 Nov 2014 18:55:07 +0000"  >&lt;p&gt;This makes yielding locks more efficient.&lt;/p&gt;</comment>
                            <comment id="760359" author="xgen-internal-githook" created="Mon, 10 Nov 2014 18:50:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16050&quot; title=&quot;Frequent yielding/sleeping causes bad perf in collscan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16050&quot;&gt;&lt;del&gt;SERVER-16050&lt;/del&gt;&lt;/a&gt;: Do not sleep when yielding&lt;/p&gt;

&lt;p&gt;Sleeping should not be necessary as ordering is purely determined&lt;br/&gt;
by the lock manager&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0c1c8e9e31bfe24aaf4ad77090dd835eae125265&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0c1c8e9e31bfe24aaf4ad77090dd835eae125265&lt;/a&gt;&lt;/p&gt;</comment>
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