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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-24970] Allow For Cache Sizes In MBs, from Config File</title>
                <link>https://jira.mongodb.org/browse/SERVER-24970</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, to set the WiredTiger cache size in MBs, rather than GBs, we&apos;re forced to do so via a commandline option (which isn&apos;t listed in the docs, or via mongod --help). This makes the assumption that nearly everyone using MongoDB has or needs large server requirements to work with, and ignores users who run services/sites/application from smaller setups (in particular, VMs).&lt;/p&gt;

&lt;p&gt;Also, as mentioned, the command arg to limit the size to MBs isn&apos;t listed, and I found it on the mongodb-user google group page:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://groups.google.com/forum/#!msg/mongodb-user/V2Q4LZAe2m0/pqNSu4psDQAJ&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!msg/mongodb-user/V2Q4LZAe2m0/pqNSu4psDQAJ&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Specifically: --wiredTigerEngineConfigString=&quot;cache_size=xxxM&quot;&lt;/p&gt;</description>
                <environment></environment>
        <key id="299825">SERVER-24970</key>
            <summary>Allow For Cache Sizes In MBs, from Config File</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="antonio-malcolm">Antonio Malcolm</reporter>
                        <labels>
                    </labels>
                <created>Sat, 9 Jul 2016 23:19:23 +0000</created>
                <updated>Thu, 14 Jul 2016 16:05:06 +0000</updated>
                            <resolved>Sun, 10 Jul 2016 22:09:57 +0000</resolved>
                                    <version>3.2.7</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1319401" author="ramon.fernandez" created="Sun, 10 Jul 2016 22:22:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=antonio-malcolm&quot; class=&quot;user-hover&quot; rel=&quot;antonio-malcolm&quot;&gt;antonio-malcolm&lt;/a&gt;, please see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22274?focusedCommentId=1156530&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1156530&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment&lt;/a&gt; explaining how to set the cache size in MBs in the config file.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1319327" author="dan@10gen.com" created="Sun, 10 Jul 2016 14:33:03 +0000"  >&lt;p&gt;This is fixed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23624&quot; title=&quot;Allow wiredTigerCacheSizeGB to be specified as a float&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23624&quot;&gt;&lt;del&gt;SERVER-23624&lt;/del&gt;&lt;/a&gt; and will be available in 3.4&lt;/p&gt;</comment>
                            <comment id="1319231" author="antonio-malcolm" created="Sun, 10 Jul 2016 00:31:37 +0000"  >&lt;p&gt;Well, I just answered my own question:&lt;br/&gt;
Error parsing option &quot;storage.wiredTiger.engineConfig.cacheSizeGB&quot; as int: Bad digit &quot;.&quot; while parsing 0.25&lt;/p&gt;

&lt;p&gt;So, your documentation is off- it needs an int, not a number. In any case, a setting lower than 1GB should be available, without resorting to an undocumented command line arg.&lt;/p&gt;</comment>
                            <comment id="1319225" author="antonio-malcolm" created="Sat, 9 Jul 2016 23:45:40 +0000"  >&lt;p&gt;OK, I just noticed the distinction, in the MongoDB docs, between &amp;lt;number&amp;gt;, as the value type, and &amp;lt;int&amp;gt;, with &amp;lt;number&amp;gt; used to set the cache size.&lt;/p&gt;

&lt;p&gt;Does this mean decimal values can be used, for the cache and in-memory sizes? That would satisfy this ticket.&lt;/p&gt;

&lt;p&gt;Also, it appears, in one of your rmore recent code changes, the use of Double was employed.... but as that was a very small subsection of your overall code base, I don&apos;t want to jump to conclusions.&lt;/p&gt;</comment>
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