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    <title>MongoDB Jira</title>
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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-19932] Consider increasing wiredTiger cache size default</title>
                <link>https://jira.mongodb.org/browse/SERVER-19932</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;WT cache uses the higher value of 50% of system memory or 1GB by default&lt;/p&gt;

&lt;p&gt;From what we&apos;ve seen, MongoDB really needs the cache, but doesn&apos;t need much memory beyond that. We just increased to 85% of system memory and are getting dramatically better performance. Of course this may vary substantially by workload and user. However, I&apos;d suggest that a higher default might be more appropriate for most users.&lt;/p&gt;

&lt;p&gt;It&apos;d be interesting to see how much heap we&apos;re using to help inform this decision, but unfortunately db.serverStatus().extra_info.heap_usage_bytes is returning a negative number - &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19931&quot; title=&quot;Overflow in db.serverStatus().extra_info&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19931&quot;&gt;&lt;del&gt;SERVER-19931&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="225488">SERVER-19932</key>
            <summary>Consider increasing wiredTiger cache size default</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="chengas123">Ben McCann</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Aug 2015 17:07:31 +0000</created>
                <updated>Thu, 13 Aug 2015 17:58:49 +0000</updated>
                            <resolved>Thu, 13 Aug 2015 17:43:25 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1004656" author="ramon.fernandez" created="Thu, 13 Aug 2015 17:42:12 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=chengas123&quot; class=&quot;user-hover&quot; rel=&quot;chengas123&quot;&gt;chengas123&lt;/a&gt;, our investigations led to a 60% default as described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19135&quot; title=&quot;Tune default cache size settings for WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19135&quot;&gt;&lt;del&gt;SERVER-19135&lt;/del&gt;&lt;/a&gt;. Further increases may be considered in the future if thorough field testing shows it&apos;s &quot;a good thing&quot; for most deployments. Thus I&apos;m going to close this ticket as a duplicate of  &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19135&quot; title=&quot;Tune default cache size settings for WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19135&quot;&gt;&lt;del&gt;SERVER-19135&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1004624" author="bruce.lucas@10gen.com" created="Thu, 13 Aug 2015 17:23:35 +0000"  >&lt;p&gt;Regarding your question about heap usage - you can get more detailed heap statistics by using db.serverStatus(&lt;/p&gt;
{tcmalloc:true}
&lt;p&gt;). Often virtual memory will be a reasonable indication of heap usage, although there are users of memory outside of heap, for example thread stacks, which could be a substantial amount of memory if you have a lot of connections.&lt;/p&gt;</comment>
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