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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2126] test use of madvise to improve performance of the replication oplog</title>
                <link>https://jira.mongodb.org/browse/SERVER-2126</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;using madvise for local.oplog.rs (or log.oplog.$main) may improve performance, as we know the access pattern.  for example this could save waste of the file system cache if the system knows in some cases it won&apos;t be needing the data again&lt;/p&gt;

&lt;p&gt;specifically:&lt;/p&gt;

&lt;p&gt;(1) MADV_SEQUENTIAL might perform better in general&lt;/p&gt;

&lt;p&gt;(2) MADV_DONTNEED might make sense on a replica set non-primary.  on a non-primary, no one is reading its oplog, we are just writing to it.&lt;/p&gt;

&lt;p&gt;if these were tested and performance was the same, I would be in favor of using, as they probably make caching smarter, if anything.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://linux.die.net/man/2/madvise&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://linux.die.net/man/2/madvise&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="13759">SERVER-2126</key>
            <summary>test use of madvise to improve performance of the replication oplog</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="-1">Unassigned</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Sat, 20 Nov 2010 23:11:48 +0000</created>
                <updated>Wed, 10 Dec 2014 23:18:54 +0000</updated>
                            <resolved>Fri, 7 Mar 2014 20:26:26 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="511805" author="milkie" created="Fri, 7 Mar 2014 20:26:26 +0000"  >&lt;p&gt;We now madvise_sequential all capped collections&lt;/p&gt;</comment>
                            <comment id="20541" author="dwight_10gen" created="Sun, 21 Nov 2010 04:47:33 +0000"  >&lt;p&gt;yes perhaps.&lt;/p&gt;</comment>
                            <comment id="20534" author="testn" created="Sun, 21 Nov 2010 02:29:50 +0000"  >&lt;p&gt;how about MADV_WILLNEED? Would it help if you read ahead oplog and find out which block of data you would need and schedule it in advance before actually read/update it? It might help if the replication is falling behind.&lt;/p&gt;</comment>
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