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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-16067] Contention on lockmgr buckets in MMAPv1</title>
                <link>https://jira.mongodb.org/browse/SERVER-16067</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Reducing contention on GroupCommit mutex (&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;) exposed another bottleneck. The attached Vtune lock profiler analysis shows that the second most evident hot lock is the one that protect the lockmgr bucket.&lt;br/&gt;
Callstack:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;Waiting Call Stack&lt;/span&gt;&lt;/pre&gt;
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					&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;1 of 10: 99.4% (549.400s of 552.974s)&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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					&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;mongod!lock+0xa - mutex.h:164&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::LockerImpl&amp;lt;(bool)1&amp;gt;::lockImpl+0x264 - lock_state.cpp:708&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::LockerImpl&amp;lt;(bool)1&amp;gt;::lock+0x27 - lock_state.cpp:422&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;and:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;Waiting Call Stack&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!scoped_lock+0 - mutex.h:170&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::LockManager::unlock+0x3b - lock_mgr_new.cpp:521&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::LockerImpl&amp;lt;(bool)1&amp;gt;::_unlockImpl+0xb0 - lock_state.cpp:718&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::LockerImpl&amp;lt;(bool)1&amp;gt;::unlock+0x1c3 - lock_state.cpp:516&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::LockerImpl&amp;lt;(bool)1&amp;gt;::endWriteUnitOfWork+0xcc - lock_state.cpp:403&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::WriteUnitOfWork::commit+0x3b - operation_context.h:176&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!singleInsert+0x1bf - batch_executor.cpp:1110&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!insertOne+0x1a0 - batch_executor.cpp:1038&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::WriteBatchExecutor::execOneInsert+0x5f - batch_executor.cpp:1063&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::WriteBatchExecutor::execInserts+0x22c - batch_executor.cpp:860&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::WriteBatchExecutor::bulkExecute+0x33 - batch_executor.cpp:754&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::WriteBatchExecutor::executeBatch+0x3a4 - batch_executor.cpp:263&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::newRunQuery+0xff9 - new_find.cpp:551&lt;/span&gt;&lt;/pre&gt;
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					&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;mongod!mongo::MyMessageHandler::process+0xdf - db.cpp:185&lt;/span&gt;&lt;/pre&gt;
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					&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;message_server_port.cpp:234&lt;/span&gt;&lt;/pre&gt;
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					&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;libc-2.18.so!__clone+0x6c - [Unknown]:[Unknown]&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt; proposes to partition Global/Flush/DB locks to reduce this contention.&lt;/p&gt;</description>
                <environment></environment>
        <key id="168423">SERVER-16067</key>
            <summary>Contention on lockmgr buckets in MMAPv1</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Tue, 11 Nov 2014 01:10:39 +0000</created>
                <updated>Thu, 4 Dec 2014 20:38:04 +0000</updated>
                            <resolved>Wed, 3 Dec 2014 21:48:02 +0000</resolved>
                                    <version>2.7.8</version>
                                    <fixVersion>2.8.0-rc2</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="776979" author="xgen-internal-githook" created="Tue, 2 Dec 2014 23:24:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16067&quot; title=&quot;Contention on lockmgr buckets in MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16067&quot;&gt;&lt;del&gt;SERVER-16067&lt;/del&gt;&lt;/a&gt;: Partition intent locks in the lock manager&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6cab2a29c7dcb56ce132c200321bd1424f977f55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6cab2a29c7dcb56ce132c200321bd1424f977f55&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="771171" author="xgen-internal-githook" created="Mon, 24 Nov 2014 15:36:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16067&quot; title=&quot;Contention on lockmgr buckets in MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16067&quot;&gt;&lt;del&gt;SERVER-16067&lt;/del&gt;&lt;/a&gt; Simplify LockHead mode count tracking&lt;/p&gt;

&lt;p&gt;Instead of using enumerations, use an increment/decrement calls in order&lt;br/&gt;
to avoid condition checking where it&apos;s not needed.&lt;/p&gt;

&lt;p&gt;Inline all LockHead methods.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b452b55fd032a4e63d9ed25c60ecc5781e0a2b27&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b452b55fd032a4e63d9ed25c60ecc5781e0a2b27&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="771170" author="xgen-internal-githook" created="Mon, 24 Nov 2014 15:36:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16067&quot; title=&quot;Contention on lockmgr buckets in MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16067&quot;&gt;&lt;del&gt;SERVER-16067&lt;/del&gt;&lt;/a&gt; Move LockRequestList to a separate header file&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5bcaa163b3fb6054cbedca1c20bd4ce98ddf1eed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5bcaa163b3fb6054cbedca1c20bd4ce98ddf1eed&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="764331" author="xgen-internal-githook" created="Fri, 14 Nov 2014 14:25:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16067&quot; title=&quot;Contention on lockmgr buckets in MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16067&quot;&gt;&lt;del&gt;SERVER-16067&lt;/del&gt;&lt;/a&gt; Split new lock acquisition and conversion into two methods&lt;/p&gt;

&lt;p&gt;This makes it clear where we do acquisitions and conversions and we can do&lt;br/&gt;
less work and decision making while holding the Lock Manager&apos;s bucket&lt;br/&gt;
mutex.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0962abcb99b52b6a9d4d03e7980569a7933394b3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0962abcb99b52b6a9d4d03e7980569a7933394b3&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="168420">SERVER-16065</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10220">
                    <name>Tested</name>
                                            <outwardlinks description="tested by">
                                                        </outwardlinks>
                                                        </issuelinktype>
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