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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-12378] findOne queries on _id field are slower in 2.6/2.4 than in 2.2</title>
                <link>https://jira.mongodb.org/browse/SERVER-12378</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Queries of the kind&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;are about 5% slower in 2.6 than in 2.2 on heavy-multithreaded tests (8-16 threads), screenshot attached.&lt;/p&gt;</description>
                <environment>Linux ip-10-237-131-70 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux</environment>
        <key id="106302">SERVER-12378</key>
            <summary>findOne queries on _id field are slower in 2.6/2.4 than in 2.2</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="3">Duplicate</resolution>
                                        <assignee username="davide.italiano">Davide Italiano</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Jan 2014 07:42:05 +0000</created>
                <updated>Wed, 18 Feb 2015 18:15:28 +0000</updated>
                            <resolved>Wed, 18 Feb 2015 18:15:28 +0000</resolved>
                                    <version>2.4.8</version>
                    <version>2.5.4</version>
                                                    <component>Concurrency</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="831904" author="rassi@10gen.com" created="Wed, 18 Feb 2015 18:15:28 +0000"  >&lt;p&gt;Resolving as dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13685&quot; title=&quot;refactor fast-path for _id queries to not create a CanonicalQuery&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13685&quot;&gt;&lt;del&gt;SERVER-13685&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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                            <attachment id="36298" name="Screenshot 2014-01-12 18.47.59.png" size="1191362" author="davide.italiano" created="Thu, 16 Jan 2014 07:42:05 +0000"/>
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