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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-66149] Investigate write stalls in mixed_workloads with dynamic concurrency</title>
                <link>https://jira.mongodb.org/browse/SERVER-66149</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When running with few read/write tickets, the mixed_workloads_genny test has episodes where writes are stopped and only reads get through:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/376931/376931_image-2022-05-03-16-53-28-828.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2038441">SERVER-66149</key>
            <summary>Investigate write stalls in mixed_workloads with dynamic concurrency</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</assignee>
                                    <reporter username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 May 2022 14:55:18 +0000</created>
                <updated>Thu, 12 May 2022 16:56:56 +0000</updated>
                            <resolved>Thu, 12 May 2022 16:56:56 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4545609" author="JIRAUSER1263153" created="Thu, 12 May 2022 16:56:37 +0000"  >&lt;p&gt;In this workload, after a long running checkpoint we accumulate lots of updates in the `config.transactions` collection (each write updates its session document). When the checkpoint transaction finishes all those updates become obsolete and WT decides to evict the page to trim the long update chain. This will happen for most pages in the collection, so write throughput gets severely affected during this time. If we had more write tickets the effect might not be as noticeable because we&apos;d evict much more pages in parallel.&lt;/p&gt;

&lt;p&gt;The cause for the long running checkpoint could be high CPU utilization.&lt;/p&gt;</comment>
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