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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-17745] Improve dirty page estimation in mmapv1 on Windows</title>
                <link>https://jira.mongodb.org/browse/SERVER-17745</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On Windows, the mmapv1 storage engine underestimates the number of dirty pages.  VirtualProtect failures, as in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10044&quot; title=&quot;Repeated Server Crash. VirtualProtect failure in mongo::makeChunkWritable (Windows 7 x64).&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10044&quot;&gt;&lt;del&gt;SERVER-10044&lt;/del&gt;&lt;/a&gt;, would occur less often if it kept a better estimate.&lt;/p&gt;</description>
                <environment></environment>
        <key id="192052">SERVER-17745</key>
            <summary>Improve dirty page estimation in mmapv1 on Windows</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="9">Done</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 Mar 2015 23:23:33 +0000</created>
                <updated>Fri, 18 Sep 2015 22:41:31 +0000</updated>
                            <resolved>Thu, 9 Apr 2015 18:53:34 +0000</resolved>
                                                    <fixVersion>3.0.3</fixVersion>
                    <fixVersion>3.1.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="891534" author="xgen-internal-githook" created="Fri, 17 Apr 2015 15:32:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17745&quot; title=&quot;Improve dirty page estimation in mmapv1 on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17745&quot;&gt;&lt;del&gt;SERVER-17745&lt;/del&gt;&lt;/a&gt;: Improve dirty page estimation in mmapv1 on Windows&lt;/p&gt;

&lt;p&gt;(cherry picked from commit fe358a4fd67fc48188eb062ae026001ff74082e9)&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cbdaff1efd3c0ba1450da45cf7ac0c6dabf62518&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cbdaff1efd3c0ba1450da45cf7ac0c6dabf62518&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="872306" author="xgen-internal-githook" created="Fri, 3 Apr 2015 15:15:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17745&quot; title=&quot;Improve dirty page estimation in mmapv1 on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17745&quot;&gt;&lt;del&gt;SERVER-17745&lt;/del&gt;&lt;/a&gt;: Improve dirty page estimation in mmapv1 on Windows&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fe358a4fd67fc48188eb062ae026001ff74082e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fe358a4fd67fc48188eb062ae026001ff74082e9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="869173" author="mark.benvenuto" created="Tue, 31 Mar 2015 17:44:40 +0000"  >&lt;p&gt;There are two ways interesting measures for an application on Windows:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;For a process, we can use &lt;a href=&quot;https://msdn.microsoft.com/en-us/library/windows/desktop/ms683219(v=vs.85).aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;GetProcessMemoryInfo&lt;/a&gt; returns &lt;a href=&quot;https://msdn.microsoft.com/en-us/library/windows/desktop/ms684877(v=vs.85).aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;PROCESS_MEMORY_COUNTERS_EX.PagefileUsage&lt;/a&gt;. This will tell us how much virtual memory the machine is using. This is the VM commit charge.&lt;/li&gt;
&lt;/ol&gt;


&lt;ol&gt;
	&lt;li&gt;For the system, we can query &lt;a href=&quot;https://msdn.microsoft.com/en-us/library/windows/desktop/aa366589%28v=vs.85%29.aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;GlobalMemoryStatusEx&lt;/a&gt;, and read &lt;a href=&quot;https://msdn.microsoft.com/en-us/library/windows/desktop/aa366770(v=vs.85).aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MEMORYSTATUSEX.ullAvailPageFile&lt;/a&gt;. This is the remaining virtual memory on the machine. This counter tells us when the machine is about to run out of memory, and therefore VirtualProtect will fail.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I have validated these APIs work as expected under Windows 8.1, Windows 2008 R2 (7), and Windows 2008 (Vista).&lt;/p&gt;

&lt;p&gt;We do need to set:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;for the pre-Windows 7 build of mongodb though.&lt;/p&gt;</comment>
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            <issuekey id="80500">SERVER-10044</issuekey>
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