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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-75098] Investigate reducing cost of cached plan preparation</title>
                <link>https://jira.mongodb.org/browse/SERVER-75098</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently preparing cached plans involve:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;cloning of PlanStage tree, including all their arguments, EExpressions, etc.&lt;/li&gt;
	&lt;li&gt;compiling EExpressions&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;preparing and linking slots accessors.&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;Investigate if is is possible to reduce that cost, for example by sharing immutable structures (like EExpressions, slot vectors, etc) and compilation results. And if so, estimate the possible performance impact.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2293645">SERVER-75098</key>
            <summary>Investigate reducing cost of cached plan preparation</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="anna.wawrzyniak@mongodb.com">Anna Wawrzyniak</assignee>
                                    <reporter username="anna.wawrzyniak@mongodb.com">Anna Wawrzyniak</reporter>
                        <labels>
                            <label>perf-tiger</label>
                    </labels>
                <created>Tue, 21 Mar 2023 16:03:01 +0000</created>
                <updated>Mon, 5 Feb 2024 16:47:34 +0000</updated>
                            <resolved>Mon, 5 Feb 2024 16:46:45 +0000</resolved>
                                                    <fixVersion>8.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5306896" author="JIRAUSER1263795" created="Tue, 28 Mar 2023 18:13:52 +0000"  >&lt;p&gt;POC for EExpression compilation caching:&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo/compare/master...aa028371d240af750c9de8368714395ef35a3ee7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/compare/master...aa028371d240af750c9de8368714395ef35a3ee7&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This produces around 3% improvement for FindProjectionDottedField, that use simple queries like&#160; {op: &quot;find&quot;, query: {}, filter: {&quot;x.y&quot;: 1, _id: 0}}&lt;/p&gt;


&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;POC for EExpression compilation caching + no PlanStage cloning (cloning replaced by makeExecutable, and the entire PlanStage is shared:&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo/compare/anna.wawrzyniak/sbe_expression_caching?expand=1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/compare/anna.wawrzyniak/sbe_expression_caching?expand=1&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This produces additional 1.4% improvement for the same query.&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="439808" name="patch_perf.svg" size="679503" author="anna.wawrzyniak@mongodb.com" created="Tue, 28 Mar 2023 18:14:34 +0000"/>
                            <attachment id="439809" name="sbe_perf.svg" size="710245" author="anna.wawrzyniak@mongodb.com" created="Tue, 28 Mar 2023 18:14:34 +0000"/>
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