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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>[DOCS-12587] Is maxIndexBuildMemoryUsageMegabytes and wiredTigerCacheSizeGB related?</title>
                <link>https://jira.mongodb.org/browse/DOCS-12587</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;b&gt;wiredTigerCacheSizeGB&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;Defines the maximum size of the internal cache that WiredTiger will use for all data.&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;For example, on a system with a total of 4GB of RAM the WiredTiger cache will use 1.5GB of RAM (0.5 * (4 GB - 1 GB) = 1.5 GB). So the remaining 2.5 GB RAM is available to the system processes.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;maxIndexBuildMemoryUsageMegabytes&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;Default: 500&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;Limits the amount of memory that simultaneous foreground index builds on one collection may consume for the duration of the builds.&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;My question here is, the 500 MB of maxIndexBuildMemoryUsageMegabytes will be used from 1.5 GB of Wired Tiger Cache or 2.5 GB remaining RAM?&lt;/p&gt;</description>
                <environment></environment>
        <key id="727256">DOCS-12587</key>
            <summary>Is maxIndexBuildMemoryUsageMegabytes and wiredTigerCacheSizeGB related?</summary>
                <type id="12510" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Feedback</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="manivannan89">Manivannan</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Apr 2019 18:52:48 +0000</created>
                <updated>Sun, 29 Oct 2023 13:56:37 +0000</updated>
                            <resolved>Wed, 1 May 2019 00:02:14 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2230075" author="kay.kim@10gen.com" created="Wed, 1 May 2019 00:02:14 +0000"  >&lt;p&gt;Heh - Forgot to resolve ticket earlier.&lt;/p&gt;</comment>
                            <comment id="2200876" author="xgen-internal-githook" created="Wed, 3 Apr 2019 17:51:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12587&quot; title=&quot;Is maxIndexBuildMemoryUsageMegabytes and wiredTigerCacheSizeGB related?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12587&quot;&gt;&lt;del&gt;DOCS-12587&lt;/del&gt;&lt;/a&gt;: v3.4 clarification between maxIndexBuildMemoryUsageMegabytes param and wiredTigerCacheSizeGB conf setting&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/bbac09620e69a789cc753a58c8d5724bbdb594b8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/bbac09620e69a789cc753a58c8d5724bbdb594b8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2200872" author="xgen-internal-githook" created="Wed, 3 Apr 2019 17:49:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12587&quot; title=&quot;Is maxIndexBuildMemoryUsageMegabytes and wiredTigerCacheSizeGB related?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12587&quot;&gt;&lt;del&gt;DOCS-12587&lt;/del&gt;&lt;/a&gt;: v3.6 clarification between maxIndexBuildMemoryUsageMegabytes param and wiredTigerCacheSizeGB conf setting&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a633f77de251327da011845eed63fa554f4fbe65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a633f77de251327da011845eed63fa554f4fbe65&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2200871" author="xgen-internal-githook" created="Wed, 3 Apr 2019 17:48:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12587&quot; title=&quot;Is maxIndexBuildMemoryUsageMegabytes and wiredTigerCacheSizeGB related?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12587&quot;&gt;&lt;del&gt;DOCS-12587&lt;/del&gt;&lt;/a&gt;: v4.2 clarification between maxIndexBuildMemoryUsageMegabytes param and wiredTigerCacheSizeGB conf setting&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b0799d13c7e80770495121226db3d8776c36daf0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b0799d13c7e80770495121226db3d8776c36daf0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2200868" author="xgen-internal-githook" created="Wed, 3 Apr 2019 17:48:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12587&quot; title=&quot;Is maxIndexBuildMemoryUsageMegabytes and wiredTigerCacheSizeGB related?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12587&quot;&gt;&lt;del&gt;DOCS-12587&lt;/del&gt;&lt;/a&gt;: v4.0 clarification between maxIndexBuildMemoryUsageMegabytes param and wiredTigerCacheSizeGB conf setting&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/be58cb125091a7b6ccda87eca5cfa0519f69391a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/be58cb125091a7b6ccda87eca5cfa0519f69391a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2199428" author="manivannan89" created="Tue, 2 Apr 2019 17:29:03 +0000"  >&lt;p&gt;Thanks Eric for the clarification.&lt;/p&gt;</comment>
                            <comment id="2199417" author="milkie" created="Tue, 2 Apr 2019 17:25:12 +0000"  >&lt;p&gt;The memory used by index builds for sorting is not shared with the WiredTiger cache.  In your question, the answer is &quot;2.5 GB remaining RAM&quot;.&lt;/p&gt;</comment>
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