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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-14129] Use fsync instead of msync for SmartOS</title>
                <link>https://jira.mongodb.org/browse/SERVER-14129</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On SmartOS msync is implemented in a very inefficient manner - it has to scan every page of the mapped region to determine which files to sync. This uses a lot of CPU time for large dbs and&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;on 2.4 can cause pauses in the app due to a lock held while doing the background flush&lt;/li&gt;
	&lt;li&gt;on 2.6 can cause pauses in the app during background flush due to CPU contention&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;On the other hand fsync of the underlying file descriptor is much more efficient, doing only the work necessary to flush the dirty pages.&lt;/p&gt;</description>
                <environment></environment>
        <key id="139549">SERVER-14129</key>
            <summary>Use fsync instead of msync for SmartOS</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>community-team</label>
                    </labels>
                <created>Mon, 2 Jun 2014 14:00:35 +0000</created>
                <updated>Mon, 11 Jul 2016 17:19:25 +0000</updated>
                            <resolved>Thu, 4 Sep 2014 15:08:43 +0000</resolved>
                                                    <fixVersion>2.7.6</fixVersion>
                                    <component>Performance</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="708088" author="xgen-internal-githook" created="Fri, 29 Aug 2014 20:31:04 +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-14129&quot; title=&quot;Use fsync instead of msync for SmartOS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14129&quot;&gt;&lt;del&gt;SERVER-14129&lt;/del&gt;&lt;/a&gt;: Use fsync instead of msync for Solaris&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/746e8835b0b841235b767628d6ae0382a85bdab0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/746e8835b0b841235b767628d6ae0382a85bdab0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="707934" author="xgen-internal-githook" created="Fri, 29 Aug 2014 18:29:00 +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-14129&quot; title=&quot;Use fsync instead of msync for SmartOS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14129&quot;&gt;&lt;del&gt;SERVER-14129&lt;/del&gt;&lt;/a&gt;: Use fsync instead of msync for Solaris&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b983d2b0858507009c1ef1589853cf9aec8dba33&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b983d2b0858507009c1ef1589853cf9aec8dba33&lt;/a&gt;&lt;/p&gt;</comment>
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