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    <title>MongoDB Jira</title>
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    <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-27406] Reduce DocumentSourceCursor batch size from 16MB to 4MB</title>
                <link>https://jira.mongodb.org/browse/SERVER-27406</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;DocumentSourceCursor batch size was changed from 4MB to 16MB for MongoDB 3.4 as part of a broader effort to unify user request batch size at 16MB under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21797&quot; title=&quot;Simplify find batching logic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21797&quot;&gt;&lt;del&gt;SERVER-21797&lt;/del&gt;&lt;/a&gt;. This change led to a mongo-perf performance regression for the &quot;Aggregation.skip&quot; which appears as slower memcpy operations under VTune under DocumentSourceCursor::loadBatch and is likely due to the larger batches exceeding L2/L3 caches.&lt;/p&gt;

&lt;p&gt;Testing across our aggregation micro-benchmarks shows a 4MB DocumentSourceCursor batch size restores previous performance across affected tests and does not penalize tests that may benefit from the batching behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="338550">SERVER-27406</key>
            <summary>Reduce DocumentSourceCursor batch size from 16MB to 4MB</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="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Dec 2016 19:03:47 +0000</created>
                <updated>Wed, 5 Apr 2017 11:42:27 +0000</updated>
                            <resolved>Tue, 27 Dec 2016 16:29:57 +0000</resolved>
                                    <version>3.4.0</version>
                                    <fixVersion>3.4.2</fixVersion>
                    <fixVersion>3.5.2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1465571" author="xgen-internal-githook" created="Tue, 27 Dec 2016 20:22:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27406&quot; title=&quot;Reduce DocumentSourceCursor batch size from 16MB to 4MB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27406&quot;&gt;&lt;del&gt;SERVER-27406&lt;/del&gt;&lt;/a&gt; Reduce DocumentSourceCursor batch size from 16MB to 4MB&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c76707775edcef041f3a83be2972a739236ef01b)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b01a43cfa073e20503f5a8a3d91c1f2024c6a2a7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b01a43cfa073e20503f5a8a3d91c1f2024c6a2a7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1465411" author="xgen-internal-githook" created="Tue, 27 Dec 2016 16:29:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27406&quot; title=&quot;Reduce DocumentSourceCursor batch size from 16MB to 4MB&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27406&quot;&gt;&lt;del&gt;SERVER-27406&lt;/del&gt;&lt;/a&gt; Reduce DocumentSourceCursor batch size from 16MB to 4MB&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c76707775edcef041f3a83be2972a739236ef01b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c76707775edcef041f3a83be2972a739236ef01b&lt;/a&gt;&lt;/p&gt;</comment>
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