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    <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-18675] WiredTiger default configuration should be adjusted for laptop (e.g. default cache size should be &lt;2G)</title>
                <link>https://jira.mongodb.org/browse/SERVER-18675</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;WiredTiger default configuration should be adjusted for laptop (e.g. default cache size should be &amp;lt;2G)&lt;/p&gt;

&lt;p&gt;On laptops (mac or windows client) , when users evaluate with WT &lt;/p&gt;

&lt;p&gt;1)	The current default of &#189; RAM size likely to be too greedy  and will cause a significant competition on RAM w/ other apps (which leads to high amount of page faults) &lt;br/&gt;
2)	The situation will be amplified if users will evaluate a replica set as our mongod apps will compete on memory&lt;br/&gt;
3)	 The laptop processor HW is usually lower then server (no L3 cache and etc)&lt;br/&gt;
4)     Higher cache size longer I/O pressure during checkpoint&lt;br/&gt;
5)	My initial verification on an empty Mac (OSX) produce the following results &lt;/p&gt;

&lt;p&gt;YCSB 50/50 load phase (insert only) measured on 3.1.4-pre-&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;&amp;nbsp;&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;1/2 memory e.g 4 G &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;1G cache &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; %Improvement w/ lower cache&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Median Throughput &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;3984 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5860 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;140% &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Avg Throughput  &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 4425&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5405 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;122%&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;



&lt;p&gt;It&#8217;s easy to detect the Mac OS or windows client platforms and adjust our default for this platform &lt;/p&gt;</description>
                <environment></environment>
        <key id="206754">SERVER-18675</key>
            <summary>WiredTiger default configuration should be adjusted for laptop (e.g. default cache size should be &lt;2G)</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="dan@mongodb.com">Daniel Pasette</assignee>
                                    <reporter username="eitan.klein">Eitan Klein</reporter>
                        <labels>
                            <label>32qa</label>
                            <label>WTAD</label>
                    </labels>
                <created>Wed, 27 May 2015 14:20:03 +0000</created>
                <updated>Thu, 25 Jun 2015 18:47:10 +0000</updated>
                            <resolved>Sun, 14 Jun 2015 02:14:03 +0000</resolved>
                                                                    <component>Admin</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="950989" author="martin.bligh" created="Thu, 25 Jun 2015 18:47:10 +0000"  >&lt;p&gt;Set to 60% of available - 1GB after discussion&lt;br/&gt;
The key difference that came up here was having more pagecache might be useful as it&apos;s compressed storage.&lt;/p&gt;</comment>
                            <comment id="939762" author="dan@10gen.com" created="Sun, 14 Jun 2015 02:14:03 +0000"  >&lt;p&gt;After further discussion, we may adjust the amount of memory devoted to the WT cache, but since we cannot anticipate the workload nor the &quot;type&quot; of machine (laptop or production server) mongodb is deployed on, we will likely opt to use more memory.&lt;/p&gt;

&lt;p&gt;Current thought is to use whichever is greater of (80% of total available - 2GB) or 1GB.&lt;/p&gt;</comment>
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