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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-20201] Performance drop over time when running with enableReplSnapshotThread=true under insert only workload</title>
                <link>https://jira.mongodb.org/browse/SERVER-20201</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;Environment:&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;2 member replica set (Windows)&lt;br/&gt;
db version v3.1.8-pre-&lt;br/&gt;
git version: 9b054f00326b23a87ba0571cbd8997b91fe5ce16&lt;/p&gt;

&lt;p&gt;Storage size: 13 GB&lt;br/&gt;
&lt;b&gt;Workload:&lt;/b&gt;&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Hammer.mongo, insert only profile with &lt;b&gt;write concern majority&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;16 threads&lt;/li&gt;
	&lt;li&gt;Execution time 12 hours&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;b&gt;Problem:&lt;/b&gt;&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The same workload w/ enableReplSnapshotThread=false produce significant better throughput  - See compare.png&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The profiler indicates high CPU as results of  __wt_tree_walk function that accountable for 80.83% of the CPU time - See profiler.png&lt;/p&gt;


</description>
                <environment></environment>
        <key id="227663">SERVER-20201</key>
            <summary>Performance drop over time when running with enableReplSnapshotThread=true under insert only workload</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="eitan.klein">Eitan Klein</reporter>
                        <labels>
                            <label>32qa</label>
                    </labels>
                <created>Sun, 30 Aug 2015 01:50:22 +0000</created>
                <updated>Tue, 6 Dec 2022 04:45:25 +0000</updated>
                            <resolved>Tue, 6 Sep 2016 05:30:16 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
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                            <attachment id="88111" name="318.html" size="3023216" author="eitan.klein" created="Sun, 30 Aug 2015 01:50:22 +0000"/>
                            <attachment id="88112" name="Compare.png" size="9545" author="eitan.klein" created="Sun, 30 Aug 2015 01:54:17 +0000"/>
                            <attachment id="88114" name="profiler.png" size="30076" author="eitan.klein" created="Sun, 30 Aug 2015 01:57:40 +0000"/>
                            <attachment id="88115" name="rs3primary.txt" size="28764072" author="eitan.klein" created="Sun, 30 Aug 2015 02:08:37 +0000"/>
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Workload - Hammer.mongo, insert only profile w/ write majority &lt;/p&gt;

&lt;p&gt;%MongoD%\mongod --wiredTigerCacheSizeGB 3 --replSet EitanRs3b --dbpath f:\data\db1   --logpath h:\data\rs3primary.txt --storageEngine wiredTiger --port 5002 --setParameter enableReplSnapshotThread=true&lt;/p&gt;</customfieldvalue>

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