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    <title>MongoDB Jira</title>
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    <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-18315] Throughput drop during transaction pinned phase of checkpoints under WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-18315</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;YCSB 30M documents, 10 fields, ~1kB/document, total ~30GB&lt;/li&gt;
	&lt;li&gt;50/50 read/update workload&lt;/li&gt;
	&lt;li&gt;40 GB cache, 128 GB memory, 32 CPUs&lt;/li&gt;
	&lt;li&gt;slow SSD disk (~80-100 MB/s)&lt;/li&gt;
	&lt;li&gt;no journal (to simplify the situation)&lt;/li&gt;
	&lt;li&gt;per mongostat, cache is at 100% utilization, 80% dirty pretty much throughout the test.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;During each checkpoint while a transaction id is pinned for the checkpoint throughput falls by an order of magnitude (but not to 0). This is accompanied by activity in the &quot;checkpoint blocked eviction&quot; counter. This is seen in B-C, F-G, J-K below:&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/72797/72797_try-13.png&quot; width=&quot;900&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Similar test with a larger cache (the default 64GB) also shows this issue.&lt;/p&gt;

&lt;p&gt;Note: this is the same test as reported in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18314&quot; title=&quot;Stall during fdatasync phase of checkpoints under WiredTiger and EXT4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18314&quot;&gt;&lt;del&gt;SERVER-18314&lt;/del&gt;&lt;/a&gt;; opening two separate tickets to track what may be separate issues.&lt;/p&gt;</description>
                <environment></environment>
        <key id="201914">SERVER-18315</key>
            <summary>Throughput drop during transaction pinned phase of 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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>FT</label>
                            <label>wttt</label>
                    </labels>
                <created>Mon, 4 May 2015 19:53:15 +0000</created>
                <updated>Mon, 22 Jun 2015 12:25:43 +0000</updated>
                            <resolved>Tue, 26 May 2015 05:04:12 +0000</resolved>
                                    <version>3.0.2</version>
                                    <fixVersion>3.0.4</fixVersion>
                    <fixVersion>3.1.3</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="922981" author="michael.cahill" created="Tue, 26 May 2015 05:03:20 +0000"  >&lt;p&gt;This fix has been backported, here: &lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/bf0408ec3310f5a81746169cb12781c931866bd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/bf0408ec3310f5a81746169cb12781c931866bd1&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It will be in MongoDB 3.0.4.&lt;/p&gt;</comment>
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            <issuekey id="201913">SERVER-18314</issuekey>
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            <issuelink>
            <issuekey id="206780">SERVER-18677</issuekey>
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                            <attachment id="72982" name="try-15-gdb.png" size="380417" author="bruce.lucas@mongodb.com" created="Tue, 5 May 2015 20:42:11 +0000"/>
                            <attachment id="72983" name="try-15.png" size="129957" author="bruce.lucas@mongodb.com" created="Tue, 5 May 2015 20:42:11 +0000"/>
                            <attachment id="74232" name="try-23.png" size="117154" author="bruce.lucas@mongodb.com" created="Wed, 13 May 2015 19:49:29 +0000"/>
                            <attachment id="74233" name="try-25.png" size="118447" author="bruce.lucas@mongodb.com" created="Wed, 13 May 2015 19:49:29 +0000"/>
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