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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>
    </build-info>


<item>
            <title>[SERVER-24943] High CPU usage fixed by server restart</title>
                <link>https://jira.mongodb.org/browse/SERVER-24943</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We noticed today that one of our Mongo servers had unexpectedly high CPU usage...which was fixed by restarting.&lt;/p&gt;

&lt;p&gt;We were running about 258 ops/s on a Google Compute instance with 12 CPUs + 24GB RAM, with 30% CPU usage. I ended up restarting the instance, and we noticed the next set of ops was MUCH lower - it didn&apos;t rise above 3%.&lt;/p&gt;

&lt;p&gt;We thought that was odd, so we repeated the test on another mongo server we had running the same code.&lt;br/&gt;
1) Run repeatable set of requests against mongo&lt;br/&gt;
2) Restart server&lt;br/&gt;
3) Run the same set of requests&lt;br/&gt;
4) Get drastically lower CPU post-restart.&lt;/p&gt;

&lt;p&gt;Any ideas on what might be happening here?&lt;/p&gt;</description>
                <environment>Debian Wheezy&lt;br/&gt;
12 CPUs, 24GB RAM on Google Compute</environment>
        <key id="299354">SERVER-24943</key>
            <summary>High CPU usage fixed by server restart</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="developer@udu.nu">udu</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Jul 2016 17:47:46 +0000</created>
                <updated>Fri, 23 Sep 2016 19:15:08 +0000</updated>
                            <resolved>Fri, 23 Sep 2016 19:15:08 +0000</resolved>
                                    <version>3.2.4</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1392288" author="thomas.schubert" created="Fri, 23 Sep 2016 19:15:08 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=developer%40udu.nu&quot; class=&quot;user-hover&quot; rel=&quot;developer@udu.nu&quot;&gt;developer@udu.nu&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the update &#8211; I&apos;m glad you were able to identify the root cause of the issue.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1392283" author="developer@udu.nu" created="Fri, 23 Sep 2016 19:10:30 +0000"  >&lt;p&gt;Hey Thomas,&lt;br/&gt;
It was a problem on our end; sorry about that.&lt;/p&gt;</comment>
                            <comment id="1350237" author="thomas.schubert" created="Mon, 8 Aug 2016 15:45:35 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=developer%40udu.nu&quot; class=&quot;user-hover&quot; rel=&quot;developer@udu.nu&quot;&gt;developer@udu.nu&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Unfortunately, we have not been able to determine the cause of this behavior from the uploaded diagnostic.data. So we can continue to investigate, would you please reproduce this issue and provide the diagnostic.data, mongodb logs, and iostats from the run?&lt;/p&gt;

&lt;p&gt;Please use the following script and upload iostat.log when the run completes:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;delay=1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;iostat -k -t -x ${delay:?} &amp;gt;iostat.log &amp;amp;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;If you are able to provide a script that reproduces this issue or could provide additional details about your workload and dataset that would help us create a reproduction, it would greatly help our investigation.&lt;/p&gt;

&lt;p&gt;Finally, there have been many improvements to WiredTiger since MongoDB 3.2.4, while I cannot point to particular ticket at this time, I would suggest that you consider upgrading to the latest version of MongoDB 3.2 and confirming whether this issue persists.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1327240" author="developer@udu.nu" created="Mon, 18 Jul 2016 17:26:11 +0000"  >&lt;p&gt;Any update on this?&lt;/p&gt;</comment>
                            <comment id="1317414" author="developer@udu.nu" created="Thu, 7 Jul 2016 20:31:40 +0000"  >&lt;p&gt;Hey Thomas,&lt;/p&gt;

&lt;p&gt;Attached it.&lt;/p&gt;

&lt;p&gt;Cheers,&lt;br/&gt;
Bruce&lt;/p&gt;</comment>
                            <comment id="1317384" author="thomas.schubert" created="Thu, 7 Jul 2016 20:02:45 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=developer%40udu.nu&quot; class=&quot;user-hover&quot; rel=&quot;developer@udu.nu&quot;&gt;developer@udu.nu&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the report. So we can continue to investigate this behavior, would you please archive (tar or zip) the &lt;tt&gt;$dbpath/diagnostic.data directory&lt;/tt&gt; and attach it to this ticket?&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="129983" name="diagnostic.data.tar" size="78991360" author="developer@udu.nu" created="Thu, 7 Jul 2016 20:30:10 +0000"/>
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