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            <title>[SERVER-17111] Performance minimum at wiredTigerConcurrentWriteTransactions=16</title>
                <link>https://jira.mongodb.org/browse/SERVER-17111</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For a constant load, as wiredTigerConcurrentWriteTransactions is varied a minimum in performance is seen at a value of 16 concurrent write transactions.&lt;/p&gt;

&lt;p&gt;Tests below on 6-CPU VMware machine.&lt;/p&gt;

&lt;p&gt;Insert-only workload, 64 clients:&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/63203/63203_insert.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Mixed (but write-heavy) workload of inserts, updates, queries, 512 clients:&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/63202/63202_mixed.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Profile and stats showing effect of changing from (effectively) unlimited to limit of 16 during the middle of a run:&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/63204/63204_insert-profile.png&quot; width=&quot;600&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&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/63205/63205_insert-ss.png&quot; width=&quot;800&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="181473">SERVER-17111</key>
            <summary>Performance minimum at wiredTigerConcurrentWriteTransactions=16</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-storage-engines">Backlog - Storage Engines Team</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Jan 2015 14:26:35 +0000</created>
                <updated>Tue, 6 Dec 2022 04:56:17 +0000</updated>
                                            <version>3.0.0-rc7</version>
                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
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