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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-78319] Investigate execution control tuning effects</title>
                <link>https://jira.mongodb.org/browse/SERVER-78319</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While for 7.0 we plan to keep the current default values for execution control tuning parameters, we should understand and document the effects of tuning these parameters. In particular, we&apos;ve seen that when the system is beyond capacity for both reads and writes, the mix of reads and writes may be different with execution control enabled. The &lt;tt&gt;throughputProbingReadWriteRatio&lt;/tt&gt; parameter will likely be important here.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2374590">SERVER-78319</key>
            <summary>Investigate execution control tuning effects</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="shinyee.tan@mongodb.com">Shin Yee Tan</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                            <label>RDY</label>
                            <label>server-rapid-response-resolved</label>
                    </labels>
                <created>Thu, 22 Jun 2023 13:08:06 +0000</created>
                <updated>Wed, 6 Sep 2023 22:05:31 +0000</updated>
                            <resolved>Mon, 31 Jul 2023 21:54:14 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5603416" author="JIRAUSER1262267" created="Mon, 31 Jul 2023 21:35:16 +0000"  >&lt;p&gt;In linkbench and ycsb workloads, we observe no significant change from enabling execution control and from toggling different &lt;tt&gt;throughputProbingReadWriteRatio&lt;/tt&gt; for regular system loads.&lt;/p&gt;

&lt;p&gt;For mixed_workloads_genny_stress where we run 1024 threads with point lookups, finds, inserts, deletes, and updates: we observe a significant improvement in write performance at the expense of a small regression in read performance.&#160;&lt;/p&gt;

&lt;p&gt;With mixed 10k thread workloads, we test our system under load.&#160;When compared to performance without execution control enabled, we observed &lt;ins&gt;improved write performance&lt;/ins&gt; (increased throughput and decreased latency) across all 3 workloads no matter what the readWriteRatio was. We see the greatest increase in write throughput with readWriteRatio at 0.5 and smaller increases as readWriteRatio was tuned higher.&lt;/p&gt;

&lt;p&gt;When the 10k threads are split evenly between reads and writes, we see &lt;ins&gt;regressions in read performance&lt;/ins&gt; with readWriteRatios ranging from 0.5-0.95 however we see smaller regressions with higher readWriteRatios. For 7.5k reads 2.5k writes, we saw an &lt;ins&gt;improvement in read performance&lt;/ins&gt; when readWriteRatio was increased to 0.9. For 9k reads 1k writes, we saw an &lt;ins&gt;improvement in read performance&lt;/ins&gt; when readWriteRatio was tuned up to 0.6 and beyond.&#160;&lt;/p&gt;</comment>
                            <comment id="5518087" author="dbeng-pm-bot" created="Thu, 22 Jun 2023 13:08:10 +0000"  >&lt;p&gt;This issue has been flagged for rapid response!&lt;/p&gt;

&lt;p&gt;Assignees of rapid response tickets are responsible for providing a daily update on this issue using the &apos;Server Rapid Response&apos; canned comment template.&lt;/p&gt;

&lt;p&gt;Any questions about this ticket can be directed to the #server-rapid-response Slack channel and more information on the Server Rapid Response process can be found on the &lt;a href=&quot;https://wiki.corp.mongodb.com/x/MTAKD&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Wiki&lt;/a&gt;&#160;&lt;/p&gt;</comment>
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