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    <title>MongoDB Jira</title>
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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-13329] Flush different regions of mmap files in parallel to achieve higher flush times on Windows</title>
                <link>https://jira.mongodb.org/browse/SERVER-13329</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Presently mmap&apos;ed file flush happens in sequence for multiple files. This results in long flush times on Azure / Windows platform where the OS is not able to do concurrent flushes of the contents of the file. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12401&quot; title=&quot;Improve the memory-mapped files flush on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12401&quot;&gt;&lt;del&gt;SERVER-12401&lt;/del&gt;&lt;/a&gt; for more details.&lt;/p&gt;

&lt;p&gt;The issue is especially critical if there are lot of random updates that dirty large parts of the mmap&apos;ed region. At some point (Q3&apos;14?) Microsoft will release the fix for the Windows Cache Manager, and we will be able to flush file regions in parallel. It will provide better performance than &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12733&quot; title=&quot;Flush mmap files in parallel to achieve better flush times on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12733&quot;&gt;&lt;del&gt;SERVER-12733&lt;/del&gt;&lt;/a&gt; on average.&lt;/p&gt;</description>
                <environment></environment>
        <key id="127285">SERVER-13329</key>
            <summary>Flush different regions of mmap files in parallel to achieve higher flush times on Windows</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Mar 2014 18:29:27 +0000</created>
                <updated>Tue, 26 Oct 2021 16:45:24 +0000</updated>
                            <resolved>Tue, 26 Oct 2021 16:45:24 +0000</resolved>
                                                                    <component>Concurrency</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="878243" author="pamp" created="Fri, 10 Apr 2015 15:39:41 +0000"  >&lt;p&gt;WhymI cant install this hotfix on windows server 2012 r2?&lt;/p&gt;

&lt;p&gt;error message: this update is not applicable to your computer..&lt;/p&gt;

&lt;p&gt;regards&lt;/p&gt;</comment>
                            <comment id="717024" author="matt.kangas@10gen.com" created="Thu, 11 Sep 2014 19:46:20 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=andrewk&quot; class=&quot;user-hover&quot; rel=&quot;andrewk&quot;&gt;andrewk&lt;/a&gt; - thanks for the offer to help test! We have not yet made changes in the server to flush in parallel, so you will (probably) see no performance gain with the hotfix at this time. We plan to revisit this after 2.8 ships.&lt;/p&gt;</comment>
                            <comment id="716488" author="andrewk" created="Thu, 11 Sep 2014 08:17:44 +0000"  >&lt;p&gt;I&apos;m happy to test this. I&apos;ve installed the patch. Is it possible to get this done in parallel now (via a flag?) or do you still have work to do on the server side?&lt;/p&gt;</comment>
                            <comment id="697449" author="matt.kangas@10gen.com" created="Wed, 20 Aug 2014 21:20:19 +0000"  >&lt;p&gt;The hotfix from Microsoft has now shipped for Windows 8 and Windows Server 2012.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://support.microsoft.com/kb/2981965&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://support.microsoft.com/kb/2981965&lt;/a&gt;&lt;/p&gt;</comment>
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