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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20642] ThreadPool should use std::deque instead of std::list to hold _pendingTasks</title>
                <link>https://jira.mongodb.org/browse/SERVER-20642</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While profiling network_interface_asio_integration_test, which uses a ThreadPool, I found that ~60% of cycles were spent in ThreadPool::schedule(). Changing _pendingTasks from a list to a deque made schedule() take a more reasonable amount of time. The culprit is probably libstdc++ not implementing list::size as an O(1) operation, despite that being mandated by the C++11 standard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="231572">SERVER-20642</key>
            <summary>ThreadPool should use std::deque instead of std::list to hold _pendingTasks</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="adam.midvidy">Adam Midvidy</assignee>
                                    <reporter username="adam.midvidy">Adam Midvidy</reporter>
                        <labels>
                    </labels>
                <created>Fri, 25 Sep 2015 16:41:09 +0000</created>
                <updated>Wed, 7 Oct 2015 21:35:51 +0000</updated>
                            <resolved>Fri, 25 Sep 2015 19:05:51 +0000</resolved>
                                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1043801" author="xgen-internal-githook" created="Fri, 25 Sep 2015 19:05:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;amidvidy&apos;, u&apos;name&apos;: u&apos;Adam Midvidy&apos;, u&apos;email&apos;: u&apos;amidvidy@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20642&quot; title=&quot;ThreadPool should use std::deque instead of std::list to hold _pendingTasks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20642&quot;&gt;&lt;del&gt;SERVER-20642&lt;/del&gt;&lt;/a&gt; store ThreadPool&apos;s _pendingTasks in a std::deque&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/90da032da6609e35ef56e63935b9cbb38e0cc4b8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/90da032da6609e35ef56e63935b9cbb38e0cc4b8&lt;/a&gt;&lt;/p&gt;</comment>
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