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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-70145] reuse threads in ServiceExecutorSynchronous</title>
                <link>https://jira.mongodb.org/browse/SERVER-70145</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;From parent ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69905&quot; title=&quot;Improve ServiceExecutorSynchronous worker threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69905&quot;&gt;SERVER-69905&lt;/a&gt;:&lt;/p&gt;

&lt;p&gt;The biggest issue is that this executor makes a fresh thread for each toplevel task. The contract of this scheduler is that a toplevel task gets a dedicated thread, but it is not promising a FRESH brand new thread, only a dedicated one. So when the toplevel task completes, the worker thread should be reusable. But we don&apos;t reuse it. We let it exit and just make new threads for each connection. This seems extremely wasteful and we should just pool these workers and hand out leases to them. Essentially this is not so different from an ordinary ThreadPool except that the threads are different kinds of objects from the stdx::thread objects managed by ThreadPool.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2149322">SERVER-70145</key>
            <summary>reuse threads in ServiceExecutorSynchronous</summary>
                <type id="5" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14716&amp;avatarType=issuetype">Sub-task</type>
                            <parent id="2143424">SERVER-69905</parent>
                                    <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="13201">Fixed</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Sep 2022 19:44:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:33 +0000</updated>
                            <resolved>Wed, 30 Nov 2022 16:04:13 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5019146" author="billy.donahue" created="Wed, 30 Nov 2022 16:04:13 +0000"  >&lt;p&gt;Done as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50171&quot; title=&quot;Move critical section log message&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50171&quot;&gt;&lt;del&gt;SERVER-50171&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt; When a worker lease is released, we make a decision about whether to kill or reuse the worker. A very simple system was added to recycle worker threads if we aren&apos;t above a soft max number (initially picked to be # of cores).&lt;/p&gt;</comment>
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