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    <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-29465] Add warning about Windows SystemFileCacheSize for WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-29465</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Some MongoDB users on Windows have switched to enabling &lt;tt&gt;direct_io&lt;/tt&gt; because the file system cache on Windows is greedy by default and can lead to content in allocated memory getting swapped out - which leads to terrible performance.&lt;/p&gt;

&lt;p&gt;Windows provides the &lt;a href=&quot;https://msdn.microsoft.com/en-us/library/aa965240.aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SetSystemFileCacheSize&lt;/a&gt; API that allows limiting the amount of memory that can be used by the file system cache. The setting is global across the computer.&lt;/p&gt;

&lt;p&gt;We could add code into MongoDB that calls the API, and limits the amount of memory the file system cache can use to a percentage of available memory.&lt;/p&gt;

&lt;p&gt;The call should only be done for storage engines that have a cache management layer. MMAP relies on the file system cache using all available memory - limiting how much memory is available would hurt MMAP users.&lt;/p&gt;

&lt;p&gt;There is further discussion in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20991&quot; title=&quot;WiredTiger caching strategy needs improvement on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20991&quot;&gt;&lt;del&gt;SERVER-20991&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="390768">SERVER-29465</key>
            <summary>Add warning about Windows SystemFileCacheSize for WiredTiger</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="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="xiangyu.yao@mongodb.com">Xiangyu Yao</assignee>
                                    <reporter username="alexander.gorrod@mongodb.com">Alexander Gorrod</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Tue, 6 Jun 2017 19:56:26 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:21 +0000</updated>
                            <resolved>Fri, 10 Nov 2017 15:40:41 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="2881424" author="muhammad.yahya" created="Mon, 17 Feb 2020 19:06:00 +0000"  >&lt;p&gt;Upgrading to newer version of 3.6 will get rid of this issue?&lt;/p&gt;</comment>
                            <comment id="1722591" author="xgen-internal-githook" created="Fri, 10 Nov 2017 15:38:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Xiangyu Yao&apos;, &apos;username&apos;: &apos;xy24&apos;, &apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29465&quot; title=&quot;Add warning about Windows SystemFileCacheSize for WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29465&quot;&gt;&lt;del&gt;SERVER-29465&lt;/del&gt;&lt;/a&gt; Add warning about Windows SystemFileCacheSize for WiredTiger&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eaf6c96f4893946cd62d6565d3aab92901b92ad8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eaf6c96f4893946cd62d6565d3aab92901b92ad8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1703332" author="xiangyu.yao" created="Wed, 18 Oct 2017 22:57:20 +0000"  >&lt;p&gt;After talking to Alex via Slack, I decided to use 40% as the percentage threshold (SystemFileCacheSize/TotalMemory) for this warning. - it matches in well with the default WiredTiger cache size, which is around 50%.&lt;/p&gt;</comment>
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