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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-16790] Lengthy pauses associated with checkpoints under WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-16790</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This test with heavy write load, 3 GB cache, shows 4-5 seconds of 0 throughput at the end of a checkpoint.&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/61347/61347_100-3GB.png&quot; width=&quot;900&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;At the end of the pause numerous operations report &amp;gt;4s latency (from &quot;mongod max logged query&quot; graph).&lt;/li&gt;
	&lt;li&gt;System CPU utilization and context switch rate are not high during the pause, so this is not due to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16662&quot; title=&quot;Extended pauses in WiredTiger when workers greatly exceeds number of cores&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16662&quot;&gt;&lt;del&gt;SERVER-16662&lt;/del&gt;&lt;/a&gt; (as that had been fixed in this version of the code).&lt;/li&gt;
	&lt;li&gt;This test has a large number of threads (50) vs cpu cores (6), but that is probably not very relevant as we are not seeing high system CPU utilization and context switch rate, but will try running with less threads to verify.&lt;/li&gt;
	&lt;li&gt;Cache size was 3 GB, and was full of dirty data; suspect larger cache size may exacerbate problem; will try.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="177852">SERVER-16790</key>
            <summary>Lengthy pauses associated with checkpoints under 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="david.hows">David Hows</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>wttt</label>
                    </labels>
                <created>Fri, 9 Jan 2015 14:44:44 +0000</created>
                <updated>Wed, 7 Dec 2016 22:50:15 +0000</updated>
                            <resolved>Fri, 26 Jun 2015 05:47:18 +0000</resolved>
                                                    <fixVersion>3.1.5</fixVersion>
                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="951423" author="michael.cahill" created="Fri, 26 Jun 2015 00:25:42 +0000"  >&lt;p&gt;Based on testing, this should be fixed in 3.1.5 be the next merge of WiredTiger.&lt;/p&gt;</comment>
                            <comment id="803792" author="michael.cahill" created="Tue, 13 Jan 2015 22:22:48 +0000"  >&lt;p&gt;Fixes in WiredTiger for RC5 should help alleviate pauses in this workload significantly.  Let&apos;s keep this open to confirm.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                        <issuelink>
            <issuekey id="182135">SERVER-17157</issuekey>
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                <attachments>
                            <attachment id="61347" name="100-3GB.png" size="286954" author="bruce.lucas@mongodb.com" created="Fri, 9 Jan 2015 14:44:44 +0000"/>
                            <attachment id="62205" name="8s-stall-end-of-checkpoint.png" size="252070" author="bruce.lucas@mongodb.com" created="Tue, 20 Jan 2015 14:49:00 +0000"/>
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