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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>
    </build-info>


<item>
            <title>[SERVER-37156] benchRun should wait for the worker threads it spawns to exit</title>
                <link>https://jira.mongodb.org/browse/SERVER-37156</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/6e65c1c22514ddb037fdb78a112fad056ac75094/src/mongo/shell/bench.cpp#L833-L835&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;benchRun()&lt;/tt&gt; calls &lt;tt&gt;.detach()&lt;/tt&gt; on the worker threads it spawns&lt;/a&gt;. This means that &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6e65c1c22514ddb037fdb78a112fad056ac75094/src/mongo/shell/bench.cpp#L1386&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;despite calling &lt;tt&gt;_brState.waitForState(BenchRunState::BRS_FINISHED)&lt;/tt&gt;&lt;/a&gt; to wait for the worker threads to not be considered &quot;active&quot;, it doesn&apos;t wait for the worker threads to actually be destructed. There is then a race in &lt;tt&gt;mongoebench&lt;/tt&gt; where the destructor for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6e65c1c22514ddb037fdb78a112fad056ac75094/src/mongo/tools/mongoebench_main.cpp#L65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the &lt;tt&gt;thread_local ServiceContext::UniqueClient currentClient&lt;/tt&gt;&lt;/a&gt; may not have run by the point &lt;tt&gt;embedded::shutdown()&lt;/tt&gt; is called. Having &lt;tt&gt;benchRun()&lt;/tt&gt; explicitly &lt;tt&gt;.join()&lt;/tt&gt; the worker threads it spawns would fix this race.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; BenchRunWorker::start() {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    stdx::&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;thread&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;([&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;this&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;] { run(); }).detach();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="605467">SERVER-37156</key>
            <summary>benchRun should wait for the worker threads it spawns to exit</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="13201">Fixed</resolution>
                                        <assignee username="max.hirschhorn@mongodb.com">Max Hirschhorn</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Sat, 15 Sep 2018 16:39:34 +0000</created>
                <updated>Sun, 29 Oct 2023 22:28:09 +0000</updated>
                            <resolved>Mon, 17 Sep 2018 18:40:50 +0000</resolved>
                                                    <fixVersion>4.0.3</fixVersion>
                    <fixVersion>4.1.4</fixVersion>
                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2011268" author="xgen-internal-githook" created="Sat, 22 Sep 2018 19:47:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37156&quot; title=&quot;benchRun should wait for the worker threads it spawns to exit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37156&quot;&gt;&lt;del&gt;SERVER-37156&lt;/del&gt;&lt;/a&gt; Wait for worker threads to exit in benchRun().&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 12dba1e5b8c5ec7532da1bfa2e05c56f021d7f06)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4fb0584284b2c04b67de206ad84f8b46421ed0ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4fb0584284b2c04b67de206ad84f8b46421ed0ea&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2005374" author="xgen-internal-githook" created="Mon, 17 Sep 2018 18:40:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Max Hirschhorn&apos;, &apos;email&apos;: &apos;max.hirschhorn@mongodb.com&apos;, &apos;username&apos;: &apos;visemet&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37156&quot; title=&quot;benchRun should wait for the worker threads it spawns to exit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37156&quot;&gt;&lt;del&gt;SERVER-37156&lt;/del&gt;&lt;/a&gt; Wait for worker threads to exit in benchRun().&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/12dba1e5b8c5ec7532da1bfa2e05c56f021d7f06&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/12dba1e5b8c5ec7532da1bfa2e05c56f021d7f06&lt;/a&gt;&lt;/p&gt;</comment>
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