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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-15344] Make replWriter thread pool size tunable</title>
                <link>https://jira.mongodb.org/browse/SERVER-15344</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#ifdef MONGO_PLATFORM_64&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    const int ReplSetImpl::replWriterThreadCount = 16;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    const int ReplSetImpl::replPrefetcherThreadCount = 16;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#else&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    const int ReplSetImpl::replWriterThreadCount = 2;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    const int ReplSetImpl::replPrefetcherThreadCount = 2;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;#endif&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;p/&gt;

&lt;p&gt;These are reasonable default, but we can make them tunable (exporting them via serverParameter) so that people can tune according to their needs. This also facilitates perf testing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="159521">SERVER-15344</key>
            <summary>Make replWriter thread pool size tunable</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="matt.dannenberg">Matt Dannenberg</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Mon, 22 Sep 2014 18:22:56 +0000</created>
                <updated>Wed, 25 May 2016 17:33:02 +0000</updated>
                            <resolved>Tue, 4 Aug 2015 13:26:32 +0000</resolved>
                                                    <fixVersion>3.1.7</fixVersion>
                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="995941" author="xgen-internal-githook" created="Tue, 4 Aug 2015 13:23:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dannenberg&apos;, u&apos;name&apos;: u&apos;matt dannenberg&apos;, u&apos;email&apos;: u&apos;matt.dannenberg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15344&quot; title=&quot;Make replWriter thread pool size tunable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15344&quot;&gt;&lt;del&gt;SERVER-15344&lt;/del&gt;&lt;/a&gt; Make replWriter thread pool size tunable&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2482017dad01990b9ab4597dcef3c43940564180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2482017dad01990b9ab4597dcef3c43940564180&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="995116" author="milkie" created="Mon, 3 Aug 2015 15:47:18 +0000"  >&lt;p&gt;Since the prefetcher threads are only used for mmapV1, this work will only make the replWriter thread pool size tunable.&lt;/p&gt;</comment>
                            <comment id="942771" author="bruce.lucas@10gen.com" created="Wed, 17 Jun 2015 11:39:58 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18908?focusedCommentId=940817&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-940817&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;This experiment&lt;/a&gt; demonstrates continued scaling by increasing worker threads beyond 16.&lt;/p&gt;</comment>
                            <comment id="941571" author="bruce.lucas@10gen.com" created="Tue, 16 Jun 2015 11:52:29 +0000"  >&lt;p&gt;I think it would be good to have a default based on the number of CPUs, but it should probably still be tunable.&lt;/p&gt;</comment>
                            <comment id="941105" author="martin.bligh" created="Mon, 15 Jun 2015 20:58:12 +0000"  >&lt;p&gt;Is it feasible to make this self-tuning rather than manual (eg num_cpus if scaling with machine size)? &lt;/p&gt;</comment>
                            <comment id="940977" author="bruce.lucas@10gen.com" created="Mon, 15 Jun 2015 19:54:54 +0000"  >&lt;p&gt;Tuning this may be necessary to avoid replication lag for some deployments. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18908?focusedCommentId=940817&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-940817&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt; for more detail.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="289374">SERVER-24292</issuekey>
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