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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-16366] Gradually degrading performance (wiredtiger)</title>
                <link>https://jira.mongodb.org/browse/SERVER-16366</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After ~24 hours or so, I am finding that performance gradually degrades.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Primary: 2.8.0rc1 WT&lt;/li&gt;
	&lt;li&gt;Secondaries:  2.8.0rc1 MMAPv1&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Please see attached MMS Screenshot.  The displayed range starts shortly after a full system restart.  Note that queues increase as well as replication lag on the secondaries.  Also attach opcounters, from which you can at least crudely see that the application load is consistent.&lt;/p&gt;

&lt;p&gt;I do not see this type of behavior when the primary is MMAPv1.&lt;/p&gt;</description>
                <environment></environment>
        <key id="171962">SERVER-16366</key>
            <summary>Gradually degrading performance (wiredtiger)</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="9">Done</resolution>
                                        <assignee username="bruce.lucas@mongodb.com">Bruce Lucas</assignee>
                                    <reporter username="cailin.nelson@mongodb.com">Cailin Nelson</reporter>
                        <labels>
                            <label>wiredtiger</label>
                    </labels>
                <created>Mon, 1 Dec 2014 18:43:39 +0000</created>
                <updated>Thu, 18 Dec 2014 23:47:05 +0000</updated>
                            <resolved>Wed, 17 Dec 2014 03:26:39 +0000</resolved>
                                    <version>2.8.0-rc1</version>
                    <version>2.8.0-rc2</version>
                                    <fixVersion>2.8.0-rc3</fixVersion>
                                    <component>Performance</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="779955" author="cailin.nelson@10gen.com" created="Fri, 5 Dec 2014 22:07:22 +0000"  >&lt;p&gt;Still seeing a performance issue, however, this one was not gradual.  Not that the opcounters drop off not because of a change in app behavior, but because the app just can&apos;t get the write through fast enough.&lt;/p&gt;

&lt;p&gt;Logs: &lt;a href=&quot;https://dropbox.10gen.com/cailin/2014-12-05-17-05/mms-qa-2014-12-15.log&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://dropbox.10gen.com/cailin/2014-12-05-17-05/mms-qa-2014-12-15.log&lt;/a&gt;&lt;br/&gt;
Disclosure:  I do have TPH enabled.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/58833/58833_mmsqa.png&quot; width=&quot;90%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Here&apos;s what it looks like after a restart of the primary:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/58835/58835_mmsqa2.png&quot; width=&quot;90%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</comment>
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