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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20419] NetworkInterfaceASIO spends 70% of its cycles in vector::erase</title>
                <link>https://jira.mongodb.org/browse/SERVER-20419</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Because we store the operations that are waiting for a connection from the pool as a std::vector&amp;lt;TaskExecutor::CallbackHandle&amp;gt;, we need to do an O&amp;#40;n) scan to remove it when we move it to the _inProgressMap.&lt;/p&gt;

&lt;p&gt;Under load (10&apos;s of thousands of concurrent ops) the cost of traversing this vector dominates the total time of an operation. This has been verified by profiling with the linux perf utility, the output of which is attached to this ticket.&lt;/p&gt;

&lt;p&gt;To remedy this, we should make CallbackHandles hashable so that we can use a better data structure with O(1) insert/removal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="229868">SERVER-20419</key>
            <summary>NetworkInterfaceASIO spends 70% of its cycles in vector::erase</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="adam.midvidy">Adam Midvidy</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Sep 2015 19:05:42 +0000</created>
                <updated>Wed, 7 Oct 2015 21:35:53 +0000</updated>
                            <resolved>Fri, 18 Sep 2015 18:56:58 +0000</resolved>
                                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Networking</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1037030" author="xgen-internal-githook" created="Fri, 18 Sep 2015 17:29:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20419&quot; title=&quot;NetworkInterfaceASIO spends 70% of its cycles in vector::erase&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20419&quot;&gt;&lt;del&gt;SERVER-20419&lt;/del&gt;&lt;/a&gt; Use constant time lookup to cancel operations waiting for a connection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5920f4fa07434626cc1ec9f8d22d696caad8e036&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5920f4fa07434626cc1ec9f8d22d696caad8e036&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="90033" name="perf.png" size="164139" author="adam.midvidy" created="Tue, 15 Sep 2015 19:06:00 +0000"/>
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