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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-77745] investigate nightly commit queue variance starting on 1/6</title>
                <link>https://jira.mongodb.org/browse/SERVER-77745</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This work was generated from the monthly SDP metrics meeting.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2357137">SERVER-77745</key>
            <summary>investigate nightly commit queue variance starting on 1/6</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="daniel.moody@mongodb.com">Daniel Moody</assignee>
                                    <reporter username="daniel.moody@mongodb.com">Daniel Moody</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Jun 2023 16:38:17 +0000</created>
                <updated>Fri, 16 Jun 2023 23:30:56 +0000</updated>
                            <resolved>Mon, 5 Jun 2023 21:23:42 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="5476346" author="JIRAUSER1253549" created="Mon, 5 Jun 2023 21:22:42 +0000"  >&lt;p&gt;I verified this is related to cache hit/miss ratio. It appears the steadiness before is because we were getting 100% hit rates consistently, and then at some point we were unable to get 100% consistently, generally get some were between 95% and &amp;lt;100%, most likely due to increased prunning activity. In the case of per-variant caches this is expected as we prune a little bit a lot more. &lt;/p&gt;

&lt;p&gt;However per variant caches were not introduced until feb 22. So that is not likely the original cause. I suspect earlier than that we were simply still prunning more as we were having size and management problems with the cache (which instigated the move to per-variant cache), and I assume size pressure was causing increased prunning activities.&lt;/p&gt;</comment>
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