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    <title>MongoDB Jira</title>
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    <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-16602] Review WiredTiger default settings for engine and collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-16602</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current setting for memory_page_max in WiredTiger collections is 100MB. This helped with throughput on insert heavy workloads.&lt;/p&gt;

&lt;p&gt;We have recently made enhancements to WiredTiger to lessen the benefit of a large memory_page_max setting. We should consider switching to the default setting (5MB).&lt;/p&gt;

&lt;p&gt;There are cases where an application thread writes a page to disk after it reaches the memory_page_max setting - having this value large can cause operations to experience high latency.&lt;/p&gt;

&lt;p&gt;I&apos;ve run a few workloads locally and see equivalent performance with a smaller memory_page_max, and generally significantly smaller values in the profiling of slow operations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="175416">SERVER-16602</key>
            <summary>Review WiredTiger default settings for engine and collections</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="alexander.gorrod@mongodb.com">Alexander Gorrod</assignee>
                                    <reporter username="alexander.gorrod@mongodb.com">Alexander Gorrod</reporter>
                        <labels>
                            <label>wiredtiger</label>
                    </labels>
                <created>Fri, 19 Dec 2014 00:42:14 +0000</created>
                <updated>Thu, 15 Jan 2015 16:46:40 +0000</updated>
                            <resolved>Tue, 13 Jan 2015 22:27:17 +0000</resolved>
                                    <version>2.8.0-rc3</version>
                                    <fixVersion>2.8.0-rc5</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="803803" author="michael.cahill" created="Tue, 13 Jan 2015 22:27:17 +0000"  >&lt;p&gt;Check that documentation of WiredTiger defaults matches the new values, as described in the last update to this issue.&lt;/p&gt;</comment>
                            <comment id="803602" author="xgen-internal-githook" created="Tue, 13 Jan 2015 19:09:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;michaelcahill&apos;, u&apos;name&apos;: u&apos;Michael Cahill&apos;, u&apos;email&apos;: u&apos;michael.cahill@wiredtiger.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16602&quot; title=&quot;Review WiredTiger default settings for engine and collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16602&quot;&gt;&lt;del&gt;SERVER-16602&lt;/del&gt;&lt;/a&gt;: Update WiredTiger default settings.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Enable up to 4 eviction threads&lt;/li&gt;
	&lt;li&gt;Reduce memory_page_max from 100MB to 10MB&lt;/li&gt;
	&lt;li&gt;Update split_pct on collections to be 90, rather than 75&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/48f0c43d138e98f5fddefe9f911fa3d89fb13c40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/48f0c43d138e98f5fddefe9f911fa3d89fb13c40&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="791647" author="eliot" created="Sun, 21 Dec 2014 11:23:11 +0000"  >&lt;p&gt;Can we do a full mongo perf run?&lt;/p&gt;</comment>
                            <comment id="790549" author="michael.cahill" created="Fri, 19 Dec 2014 02:41:35 +0000"  >&lt;p&gt;If the impact on multi-threaded insert workloads is minimal, I would support setting &lt;tt&gt;memory_page_max=10MB&lt;/tt&gt;.  I&apos;m concerned about &lt;tt&gt;5MB&lt;/tt&gt; because inserting 5x 1MB documents will force eviction.&lt;/p&gt;

&lt;p&gt;Can we gather the following data:&lt;/p&gt;

&lt;p&gt;(1) impact on the throughput of a multi-threaded insert workload; and&lt;br/&gt;
(2) impact on latencies in a multi-threaded update workload.&lt;/p&gt;</comment>
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            <issuekey id="170663">SERVER-16269</issuekey>
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