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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-81786] Avoid future and scheduling overhead on sync command path</title>
                <link>https://jira.mongodb.org/browse/SERVER-81786</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Futures have a heavily optimized fast path for the case when they are already ready. It is intended to be essentially free in that case, while there is some unavoidable overhead in the case where it isn&apos;t yet ready at the time you chain additional work. &lt;a href=&quot;https://github.com/10gen/mongo/blob/6b1022db1ddcebecdb714b84d505df86898f2ce9/src/mongo/db/service_entry_point_common.cpp#L2155-L2223&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This code&lt;/a&gt; is using a slower &quot;not-ready-yet&quot; path for futures, even though it triggers the chain before returning. Defuturizing or at least using &lt;tt&gt;makeReadyFutureWith()&lt;/tt&gt; should be an easy win. Instead of doing this manually, consider just reverting &lt;a href=&quot;https://github.com/10gen/mongo/commit/f522af24c8cc07bdb4d2437074e9d8b3e01a880e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this revert&lt;/a&gt; which reintroduced the suboptimal usage of futures here.&lt;/p&gt;

&lt;p&gt;This patch to &lt;a href=&quot;https://github.com/10gen/mongo/blob/6b1022db1ddcebecdb714b84d505df86898f2ce9/src/mongo/transport/session_workflow.cpp#L806-L837&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SessionWorkflow::_scheduleNextIteration&lt;/a&gt; will bypass the scheduler overhead and keep running eager futures for sync networking:&lt;/p&gt;

&lt;p/&gt;
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</description>
                <environment></environment>
        <key id="2457142">SERVER-81786</key>
            <summary>Avoid future and scheduling overhead on sync command path</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>perf-tiger</label>
                            <label>perf-tiger-handoff</label>
                    </labels>
                <created>Tue, 3 Oct 2023 11:33:39 +0000</created>
                <updated>Wed, 4 Oct 2023 13:17:04 +0000</updated>
                            <resolved>Wed, 4 Oct 2023 13:10:08 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5751806" author="redbeard0531" created="Wed, 4 Oct 2023 13:17:04 +0000"  >&lt;p&gt;Sorry, I got an error when submitting the new issue so I assumed it didn&apos;t go through and tried again. My bad!&lt;/p&gt;</comment>
                            <comment id="5751795" author="jason.chan" created="Wed, 4 Oct 2023 13:09:53 +0000"  >&lt;p&gt;The descriptions have slightly different text but I think this is a dupe of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81786&quot; title=&quot;Avoid future and scheduling overhead on sync command path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81786&quot;&gt;&lt;del&gt;SERVER-81786&lt;/del&gt;&lt;/a&gt; so I&apos;m going to close this in favor of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81785&quot; title=&quot;Avoid future and scheduling overhead on sync command path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81785&quot;&gt;&lt;del&gt;SERVER-81785&lt;/del&gt;&lt;/a&gt;. Feel free to re-open if this isn&apos;t the case &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mathias%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mathias@mongodb.com&quot;&gt;mathias@mongodb.com&lt;/a&gt;.&lt;/p&gt;</comment>
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