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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-16938] 60-second stall between checkpoints under WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-16938</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During one 10-minute run of a heavy mixed workload observed a 60-second stall, apparently coinciding with the time between the end of one checkpoint and the start of another.&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/62196/62196_60s-stall-between-checkpoints.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;From A to B throughput drops to near 0.&lt;/li&gt;
	&lt;li&gt;mongod log shows a handful of ops completing throughout this period, with increasing latencies suggesting that they have been waiting since A.&lt;/li&gt;
	&lt;li&gt;page acquire time sleeping suggests most threads (about 93 out of 100) are waiting for access to pages&lt;/li&gt;
	&lt;li&gt;throughout this period 40 pages per second are being evicted because they exceeded in-memory maximum&lt;/li&gt;
	&lt;li&gt;yet cache statistics show nothing leaving the cache and no change in cache sizes during this period&lt;/li&gt;
	&lt;li&gt;at the end of the period about 2500 failed evictions are reported within 1 second. This is about the same number as the number of pages evicted during that period, i.e. 60 seconds * 40 pages / second. Is that a coincidence, or are the failed evictions reported at the end of the period the same evictions that were reported througout the period?&lt;/li&gt;
	&lt;li&gt;the 60-second stall appears to coinicide with the time between the end of one checkpoint and the start of the next.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="179602">SERVER-16938</key>
            <summary>60-second stall between 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="5">Cannot Reproduce</resolution>
                                        <assignee username="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>wttt</label>
                    </labels>
                <created>Tue, 20 Jan 2015 13:53:22 +0000</created>
                <updated>Thu, 14 Apr 2016 15:17:43 +0000</updated>
                            <resolved>Mon, 22 Jun 2015 12:04:41 +0000</resolved>
                                    <version>2.8.0-rc5</version>
                                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="946778" author="bruce.lucas@10gen.com" created="Mon, 22 Jun 2015 12:04:41 +0000"  >&lt;p&gt;Have not seen this issue recently, presuming addressed by one of the performance changes since this ticket was opened.&lt;/p&gt;</comment>
                            <comment id="822350" author="dan@10gen.com" created="Thu, 5 Feb 2015 16:10:05 +0000"  >&lt;p&gt;We&apos;re playing whack-a-mole with perf issues at this point.  I&apos;m moving this out of rc8 while we do a comprehensive analysis of outstanding issues.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="182135">SERVER-17157</issuekey>
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                            <attachment id="65103" name="throttle-rc9-01-gdb.html" size="67554778" author="bruce.lucas@mongodb.com" created="Wed, 18 Feb 2015 15:28:21 +0000"/>
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