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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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            <title>[SERVER-34737] mongo_lock.py graph should reflect thread queue order</title>
                <link>https://jira.mongodb.org/browse/SERVER-34737</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider the following lock wait scenario:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Thread T1 has acquired a database lock with MODE_IX&lt;/li&gt;
	&lt;li&gt;Thread T2 requests the same lock with MODE_X&lt;/li&gt;
	&lt;li&gt;Thread T3 requests the same lock with MODE_IX&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The mongo_lock.py graph will have a line from both T2 and T3 to the database lock, indicating that both are waiting on the same lock. What is missing from this picture is that T1 is really waiting behind T2 in the lock acquisition queue and could otherwise acquire the lock if the T2 acquisition were interrupted.&lt;/p&gt;

&lt;p&gt;What may be a clearer representation would be a chart that showed T2 waiting on lock acquisition and T1 waiting on T2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="535353">SERVER-34737</key>
            <summary>mongo_lock.py graph should reflect thread queue order</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-stm">Backlog - Server Tooling and Methods (STM)</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                            <label>stm</label>
                            <label>tig-hanganalyzer</label>
                    </labels>
                <created>Fri, 27 Apr 2018 19:10:13 +0000</created>
                <updated>Tue, 6 Dec 2022 03:30:58 +0000</updated>
                                                                            <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4539755" author="steven.vannelli" created="Tue, 10 May 2022 21:22:26 +0000"  >&lt;p&gt;Moving this ticket to the Backlog and removing the &quot;Backlog&quot; fixVersion as per our latest policy for using fixVersions. &lt;/p&gt;</comment>
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