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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-38815] Expose an absolute dirty size to the eviction configuration parameters</title>
                <link>https://jira.mongodb.org/browse/SERVER-38815</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Expose two configurable options that control the targeted and maximum levels of dirty data allowed in cache. The options will accept a floating-point value in gigabytes, like cacheSizeGB.&lt;/p&gt;

&lt;p&gt;eviction_dirty_target can be thought of as the targeted amount of dirty data allowed in cache. Anything larger, and worker threads start eviction.&lt;br/&gt;
eviction_dirty_trigger can be thought of as a maximum amount of dirty data allowed in cache before application threads start eviction.&lt;/p&gt;</description>
                <environment></environment>
        <key id="664785">SERVER-38815</key>
            <summary>Expose an absolute dirty size to the eviction configuration parameters</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="13201">Fixed</resolution>
                                        <assignee username="josef.ahmad@mongodb.com">Josef Ahmad</assignee>
                                    <reporter username="dmitry.agranat@mongodb.com">Dmitry Agranat</reporter>
                        <labels>
                            <label>louis-preferred</label>
                    </labels>
                <created>Thu, 3 Jan 2019 10:24:26 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:24 +0000</updated>
                            <resolved>Wed, 8 Sep 2021 20:45:33 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>3</votes>
                                    <watches>24</watches>
                                                                                                                <comments>
                            <comment id="4045918" author="xgen-internal-githook" created="Wed, 8 Sep 2021 20:41:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Josef Ahmad&apos;, &apos;email&apos;: &apos;josef.ahmad@mongodb.com&apos;, &apos;username&apos;: &apos;josefahmad&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38815&quot; title=&quot;Expose an absolute dirty size to the eviction configuration parameters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38815&quot;&gt;&lt;del&gt;SERVER-38815&lt;/del&gt;&lt;/a&gt; Expose an absolute dirty size to the eviction configuration parameters&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/46b7bdbc6a3d9a3e181bf5a1b8c2739c0dc80838&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/46b7bdbc6a3d9a3e181bf5a1b8c2739c0dc80838&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3895755" author="geert.bosch" created="Thu, 24 Jun 2021 03:10:56 +0000"  >&lt;p&gt;I don&apos;t understand: a customer should be able to know the memory size of their server and configure an appropriate percentage. It would seem that expressing the value as an absolute number is just a shortcut to doing the computation for a specific configuration. I can see how it might make sense to use absolute values in some circumstances, but I fail to understand how it&apos;s more than a convenience. On a related note, it doesn&apos;t seem unreasonable to assume that checkpointing resource (in terms of IOPS and avalable compute power) scales to some degree with the memory size, so a 1 TB system should be OK writing 1 GB/sec while a 16GB system would be maxed out at 50 MB/sec. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dmitry.agranat&quot; class=&quot;user-hover&quot; rel=&quot;dmitry.agranat&quot;&gt;dmitry.agranat&lt;/a&gt;, could you give some clarification whether an absolute size is a convenience feature or more than that?&lt;/p&gt;</comment>
                            <comment id="3132777" author="dianna.hohensee" created="Wed, 27 May 2020 21:05:41 +0000"  >&lt;p&gt;So WT&apos;s solution in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3632&quot; title=&quot;Increase how granularly cache usage settings can be configured&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3632&quot;&gt;&lt;del&gt;WT-3632&lt;/del&gt;&lt;/a&gt; appears to have been to sort of overload all of the eviction settings. 0 to 100 values are considered percentages of cache; while &amp;gt;100 settings are consider an absolute size.&lt;/p&gt;

&lt;p&gt;We do not pass eviction settings through MongoDB today. We won&apos;t change that. I will add a new MongoDB server parameter just for absolute dirty cache size.&lt;/p&gt;</comment>
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