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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-53970] Explore ways to improve SBE plans generation performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-53970</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During the investigation in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51657&quot; title=&quot;Investigate micro-benchmarks performance in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51657&quot;&gt;&lt;del&gt;SERVER-51657&lt;/del&gt;&lt;/a&gt; in became clear that the process of SBE plan construction for a query can take a lot of time. In case of point queries that process small amount of data we have noticed up to 30% performance regression when comparing SBE with classic engine because of that.&lt;/p&gt;

&lt;p&gt;There are several strategies to address this which were discuss by SBE team:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Implement caching of the whole SBE plan. Suggested by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=martin.neupauer&quot; class=&quot;user-hover&quot; rel=&quot;martin.neupauer&quot;&gt;martin.neupauer&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;SBE builders allocate a lot of expressions/PlanStages and very rarely delete them. Often they are deleted only after the plan was executed, all at once. It seems like a good use case for a simple bump allocator. Suggested by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nikita.lapkov&quot; class=&quot;user-hover&quot; rel=&quot;nikita.lapkov&quot;&gt;nikita.lapkov&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov&quot;&gt;anton.korshunov&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ian.boros&quot; class=&quot;user-hover&quot; rel=&quot;ian.boros&quot;&gt;ian.boros&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Both strategies require a lot of engineering effort, so we should carefully choose between them (or explore other ways to improve the performance of SBE builders).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1597638">SERVER-53970</key>
            <summary>Explore ways to improve SBE plans generation performance</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="nikita.lapkov@mongodb.com">Nikita Lapkov</reporter>
                        <labels>
                            <label>sbe-post-v1</label>
                    </labels>
                <created>Fri, 22 Jan 2021 15:02:31 +0000</created>
                <updated>Mon, 8 Jan 2024 15:22:51 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="3579956" author="JIRAUSER1255444" created="Mon, 25 Jan 2021 12:00:09 +0000"  >&lt;p&gt;Hey &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mira.carey%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mira.carey@mongodb.com&quot;&gt;mira.carey@mongodb.com&lt;/a&gt;, thank you so much for the example!&lt;/p&gt;</comment>
                            <comment id="3578976" author="jason.carey" created="Fri, 22 Jan 2021 22:48:20 +0000"  >&lt;p&gt;I&apos;d certainly be interested in someone tackling a bump allocator in the codebase.&lt;/p&gt;

&lt;p&gt;If you&apos;re looking for something to crib off a bit, we do have another non-std allocator floating around today: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/base/secure_allocator.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/base/secure_allocator.h&lt;/a&gt;.  We use that to enforce allocations for secrets (keep them from getting paged to disk and zeroing them on destruction).  It&apos;s definitely not 1 to 1, but it does demonstrate most of the boiler plate you&apos;ll need if you want to use an allocator with std containers&lt;/p&gt;</comment>
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