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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-65290] Run snapshot_reads benchmark with 32/64 tickets and a single FIFO queue</title>
                <link>https://jira.mongodb.org/browse/SERVER-65290</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65156&quot; title=&quot;Analyze performance runs with varying numbers of read/write tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65156&quot;&gt;&lt;del&gt;SERVER-65156&lt;/del&gt;&lt;/a&gt;&#160;we noticed&#160;snapshot_reads had some strange behaviour. In the high concurrency cases,&#160;&lt;tt&gt;snapshot_reads_load_throughput&lt;/tt&gt; improved considerably when reducing the number of maximum tickets, which was in line with other (write) workloads such as ParallelInsert. However &lt;tt&gt;snapshot_reads_with_load&lt;/tt&gt; regressed a lot.&lt;/p&gt;

&lt;p&gt;This test runs writes in half the threads and snapshot reads in the other half. Our guess is that the reduced number of tickets improved our write throughput, and our improved write throughput could have affected negatively our read throughput, possibly due to&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-9074&quot; title=&quot;Reconsider spinlocks in transaction ID allocation path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-9074&quot;&gt;WT-9074&lt;/a&gt;.&#160;&lt;/p&gt;

&lt;p&gt;One way to reduce the read threads starvation would be to have them share a single FIFO queue with writes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2018147">SERVER-65290</key>
            <summary>Run snapshot_reads benchmark with 32/64 tickets and a single FIFO queue</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</reporter>
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                <created>Wed, 6 Apr 2022 14:26:35 +0000</created>
                <updated>Wed, 20 Apr 2022 10:42:51 +0000</updated>
                            <resolved>Wed, 20 Apr 2022 10:42:51 +0000</resolved>
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