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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-27961] Help to analyze diagnostic.data after crash with OOM</title>
                <link>https://jira.mongodb.org/browse/SERVER-27961</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi!&lt;/p&gt;

&lt;p&gt;Could you help me please to analyze diagnostic.data from shard?&lt;br/&gt;
Today my mongod process was killed by OOM. So far, I don&apos;t know what I should change that avoid this behavior. Maybe after you see diagnostic data and config for shards you will can advise me what I should change. Also, we don&apos;t use swap and we increase cacheSizeGB, available RAM is 47G. Thanks.&lt;/p&gt;
</description>
                <environment>Operating System: CentOS Linux 7 (Core)&lt;br/&gt;
CPE OS Name: cpe:/o:centos:centos:7&lt;br/&gt;
Kernel: Linux 3.14.31&lt;br/&gt;
Architecture: x86-64&lt;br/&gt;
-----------------------------------&lt;br/&gt;
WiredTiger&lt;br/&gt;
db version v3.4.1&lt;br/&gt;
git version: 5e103c4f5583e2566a45d740225dc250baacfbd7&lt;br/&gt;
OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013&lt;br/&gt;
allocator: tcmalloc&lt;br/&gt;
modules: none&lt;br/&gt;
build environment:&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;distmod: rhel70&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;distarch: x86_64&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;target_arch: x86_64</environment>
        <key id="352940">SERVER-27961</key>
            <summary>Help to analyze diagnostic.data after crash with OOM</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="Budulianin">Grigorii Eremeev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Feb 2017 15:50:54 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:35 +0000</updated>
                            <resolved>Thu, 9 Feb 2017 21:36:43 +0000</resolved>
                                    <version>3.4.1</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1496428" author="alexander.gorrod" created="Thu, 9 Feb 2017 21:36:33 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Grigorii&quot; class=&quot;user-hover&quot; rel=&quot;Grigorii&quot;&gt;Grigorii&lt;/a&gt; It appears as though you have configured MongoDB to have a 40GB WiredTiger cache, with 47GB of system memory. As a starting point that doesn&apos;t leave much memory available for other processes on the system, so I would recommend configuring a smaller cache size. From the data you uploaded, I can see that only 32GB of cache where in use when the process was terminated, so 40GB is significantly above the amount of available memory on your system.&lt;/p&gt;

&lt;p&gt;It is also important to note that the WiredTiger cache size is &lt;b&gt;not&lt;/b&gt; the total memory budget for MongoDB - it is only the memory allocated to cache data in order to minimize disk I/O.&lt;/p&gt;

&lt;p&gt;I&apos;d recommend configuring a smaller WiredTiger cache size, and monitoring your system memory usage to see whether the amount of memory used by all processes is approaching your available cache size.&lt;/p&gt;

&lt;p&gt;This forum is for reporting bugs in MongoDB - wheras your question is about a configuration problem. If you have follow up questions you are better to ask on the &lt;a href=&quot;https://groups.google.com/forum/#!forum/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB users google group&lt;/a&gt;.&lt;/p&gt;</comment>
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                    <attachments>
                            <attachment id="149117" name="metrics.2017-02-09T10-34-34Z-00000" size="2040061" author="grigorii" created="Thu, 9 Feb 2017 15:43:25 +0000"/>
                            <attachment id="149116" name="mongod_shard.conf" size="697" author="grigorii" created="Thu, 9 Feb 2017 15:47:28 +0000"/>
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