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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-28026] Disable auto-tuning of WiredTiger eviction threads</title>
                <link>https://jira.mongodb.org/browse/SERVER-28026</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2898&quot; title=&quot;Improve performance of eviction-heavy workloads by dynamically controlling the number of eviction threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2898&quot;&gt;&lt;del&gt;WT-2898&lt;/del&gt;&lt;/a&gt;, we added code to automatically tune the number of eviction worker threads in WiredTiger.  That work (a) assumed &lt;tt&gt;eviction.threads_max&lt;/tt&gt; was reasonably large (e.g., 8), and (b) was driven by test workloads where the behavior at startup matches the long-term workload behavior.&lt;/p&gt;

&lt;p&gt;To avoid MongoDB users being adversely affected by that change, we should disable it in 3.2 and 3.4 by changing the default &lt;tt&gt;eviction.threads_min=4&lt;/tt&gt; &amp;#8211; i.e., &lt;tt&gt;min threads = max threads = 4&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="354219">SERVER-28026</key>
            <summary>Disable auto-tuning of WiredTiger eviction threads</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="alexander.gorrod@mongodb.com">Alexander Gorrod</assignee>
                                    <reporter username="michael.cahill@mongodb.com">Michael Cahill</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Feb 2017 04:10:02 +0000</created>
                <updated>Thu, 13 Apr 2017 18:03:17 +0000</updated>
                            <resolved>Mon, 20 Feb 2017 21:36:10 +0000</resolved>
                                                    <fixVersion>3.2.13</fixVersion>
                    <fixVersion>3.4.3</fixVersion>
                    <fixVersion>3.5.4</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1548714" author="xgen-internal-githook" created="Thu, 13 Apr 2017 18:00:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agorrod&apos;, u&apos;name&apos;: u&apos;Alex Gorrod&apos;, u&apos;email&apos;: u&apos;alexander.gorrod@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28026&quot; title=&quot;Disable auto-tuning of WiredTiger eviction threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28026&quot;&gt;&lt;del&gt;SERVER-28026&lt;/del&gt;&lt;/a&gt; Ensure WiredTiger eviction threads are started&lt;br/&gt;
(cherry picked from commit 5a3ecdc731673c82cc841eaecf2bc59067c067be)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/361f6986096caf3445cb3e41969d1dbf087223b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/361f6986096caf3445cb3e41969d1dbf087223b5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1516427" author="xgen-internal-githook" created="Mon, 6 Mar 2017 05:55:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agorrod&apos;, u&apos;name&apos;: u&apos;Alex Gorrod&apos;, u&apos;email&apos;: u&apos;alexander.gorrod@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28026&quot; title=&quot;Disable auto-tuning of WiredTiger eviction threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28026&quot;&gt;&lt;del&gt;SERVER-28026&lt;/del&gt;&lt;/a&gt; Ensure WiredTiger eviction threads are started&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 5a3ecdc731673c82cc841eaecf2bc59067c067be)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9aa85b8390c6361a3363d946e0e34e4c227f572c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9aa85b8390c6361a3363d946e0e34e4c227f572c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1504076" author="xgen-internal-githook" created="Mon, 20 Feb 2017 00:01:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agorrod&apos;, u&apos;name&apos;: u&apos;Alex Gorrod&apos;, u&apos;email&apos;: u&apos;alexander.gorrod@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28026&quot; title=&quot;Disable auto-tuning of WiredTiger eviction threads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28026&quot;&gt;&lt;del&gt;SERVER-28026&lt;/del&gt;&lt;/a&gt; Ensure WiredTiger eviction threads are started&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5a3ecdc731673c82cc841eaecf2bc59067c067be&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5a3ecdc731673c82cc841eaecf2bc59067c067be&lt;/a&gt;&lt;/p&gt;</comment>
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