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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-65156] Analyze performance runs with varying numbers of read/write tickets</title>
                <link>https://jira.mongodb.org/browse/SERVER-65156</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Schedule performance runs in 3 node repl sets with&#160;varying numbers of read/write tickets, for instance 32, 64 and 256. Analyze results to find out any workloads that would benefit from more (or less) throttling.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2014002">SERVER-65156</key>
            <summary>Analyze performance runs with varying numbers of read/write tickets</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>
                        <labels>
                    </labels>
                <created>Fri, 1 Apr 2022 09:47:14 +0000</created>
                <updated>Wed, 20 Apr 2022 10:43:26 +0000</updated>
                            <resolved>Wed, 20 Apr 2022 10:43:26 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4457945" author="JIRAUSER1263153" created="Tue, 5 Apr 2022 15:04:42 +0000"  >&lt;p&gt;LltMixed has lots of failed queries, the benchmark might be counting them as completed queries. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt;&#160;said transactions timeout if they can&apos;t take a ticket under 5 ms, that would explain why so many timeout with a reduced number of tickets.&lt;/p&gt;</comment>
                            <comment id="4457854" author="JIRAUSER1264163" created="Tue, 5 Apr 2022 14:42:45 +0000"  >&lt;p&gt;And in the case of reducing tickets to 32, there are:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Substantial improvements in throughput for LltMixed on long lived writes.&lt;/li&gt;
	&lt;li&gt;Improvements in general for MixedWorkloadsGenny for writes.&lt;/li&gt;
	&lt;li&gt;Improvement for ParallelInsertReplica(DelayMixed) with high numbers of threads&lt;/li&gt;
	&lt;li&gt;Improvement on Ycsb60Gb for 100% reads&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="4457705" author="JIRAUSER1264163" created="Tue, 5 Apr 2022 14:06:31 +0000"  >&lt;p&gt;In general it seems that there is no reason to increase tickets by default to 256 as there&apos;s no workload that improves while there&apos;s a general regression in all of them&lt;/p&gt;</comment>
                            <comment id="4457644" author="JIRAUSER1264163" created="Tue, 5 Apr 2022 13:47:25 +0000"  >&lt;p&gt;SbLargeScale, and CrudWorkloadsMajority also benefit greatly from reduced number of tickets, leading to a substantial increase in throughput with 64 tickets.&lt;/p&gt;

&lt;p&gt;There&apos;s additionally a decrease in latency on ChangeStreamsLatency, and MixedWorkloadsGenny with writes in large number of threads.&lt;/p&gt;

&lt;p&gt;And a possible thgroughput increase in MixedWorkloads.&lt;/p&gt;</comment>
                            <comment id="4457303" author="JIRAUSER1263153" created="Tue, 5 Apr 2022 11:16:23 +0000"  >&lt;p&gt;ParallelInsertReplica and&#160;ParallelInsertReplicaDelayMixed show improvements with lower number of tickets.&lt;/p&gt;</comment>
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