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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>
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<item>
            <title>[SERVER-15950] Reduce contention on groupCommitMutex in MMAP V1</title>
                <link>https://jira.mongodb.org/browse/SERVER-15950</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On insert-only workload (e.g. sysbench first phase), groupCommitMutex shows up as the most congested lock. Attached the Vtune lock profiler output as an evidence&lt;/p&gt;</description>
                <environment></environment>
        <key id="167288">SERVER-15950</key>
            <summary>Reduce contention on groupCommitMutex in MMAP V1</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Tue, 4 Nov 2014 18:14:11 +0000</created>
                <updated>Wed, 19 Nov 2014 16:26:40 +0000</updated>
                            <resolved>Thu, 6 Nov 2014 22:15:16 +0000</resolved>
                                    <version>2.7.8</version>
                                    <fixVersion>2.8.0-rc0</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="758311" author="xgen-internal-githook" created="Thu, 6 Nov 2014 22:14:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15950&quot; title=&quot;Reduce contention on groupCommitMutex in MMAP V1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15950&quot;&gt;&lt;del&gt;SERVER-15950&lt;/del&gt;&lt;/a&gt; Optimize handing of writingPtr&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;No longer need to allocate memory per call to writingPtr.&lt;/li&gt;
	&lt;li&gt;Write intents within a single WUOW are coalesced if overlapping or adjacent.&lt;/li&gt;
	&lt;li&gt;Committing a WUOW only grabs the groupCommitMutex once.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a1fc18243a20cc8c5fd4ef7ee3e9f2078b4139d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a1fc18243a20cc8c5fd4ef7ee3e9f2078b4139d7&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="756647" author="kaloian.manassiev" created="Wed, 5 Nov 2014 15:48:22 +0000"  >&lt;p&gt;Note that this is specific to MMAP V1, in case you were trying with other storage engines. Disabling journaling should help.&lt;/p&gt;</comment>
                            <comment id="756436" author="tmcallaghan" created="Wed, 5 Nov 2014 08:57:56 +0000"  >&lt;p&gt;Is this gating the performance improvement I&apos;d expect to see with collection level locking? Is disabling journaling a work-around for now?&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="56044" name="vtune_profiler_groupcommit.png" size="442827" author="davide.italiano" created="Tue, 4 Nov 2014 18:14:11 +0000"/>
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