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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-36875] Compare Performance between 3.4 and 4.0 </title>
                <link>https://jira.mongodb.org/browse/SERVER-36875</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a mongoDB community In Korea. &lt;br/&gt;
Last week , member of the community posted something about mongoDB performance .&lt;br/&gt;
He compared the performance using ycsb mongodb4.0 VS Mongodb3.4 . &lt;br/&gt;
the result show 3.4 show better performance than 4.0 .&lt;/p&gt;

&lt;p&gt;I attached the tested result image .&lt;/p&gt;

&lt;p&gt;Here is the test env.&lt;br/&gt;
SAME OS, HW, 3 member replica set ,SAME conf file&lt;/p&gt;

&lt;p&gt;Workload A: 50/50% Mix of Reads/Writes&lt;br/&gt;
Workload B: 95/5% Mix of Reads/Writes&lt;br/&gt;
Workload C: 100% reads&lt;/p&gt;</description>
                <environment></environment>
        <key id="594850">SERVER-36875</key>
            <summary>Compare Performance between 3.4 and 4.0 </summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-perf">Backlog - Performance Team</assignee>
                                    <reporter username="jun.kim@mongodb.com">Jun Kim</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 Aug 2018 02:35:17 +0000</created>
                <updated>Tue, 6 Dec 2022 03:19:36 +0000</updated>
                            <resolved>Tue, 18 Sep 2018 14:58:31 +0000</resolved>
                                    <version>4.0.1</version>
                                                    <component>Performance</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="2163264" author="sallgeud" created="Tue, 26 Feb 2019 17:51:35 +0000"  >&lt;p&gt;Even then. Seems like a 10% regression on a point release is a major issue.&#160;&lt;/p&gt;</comment>
                            <comment id="2162603" author="asya" created="Tue, 26 Feb 2019 05:30:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sallgeud&quot; class=&quot;user-hover&quot; rel=&quot;sallgeud&quot;&gt;sallgeud&lt;/a&gt; our measures showed significantly lower regression (closer to 10% and no where near 50%).&lt;/p&gt;</comment>
                            <comment id="2157396" author="sallgeud" created="Wed, 20 Feb 2019 18:56:48 +0000"  >&lt;p&gt;We saw something similar in 3.6. I&apos;m curious why you&apos;d &quot;Won&apos;t fix&quot; a 10-50% performance regression?&#160; How much were you able to reclaim? How much was left?&lt;/p&gt;</comment>
                            <comment id="2006523" author="david.daly" created="Tue, 18 Sep 2018 14:58:31 +0000"  >&lt;p&gt;We&apos;re aware of regressions since 3.4 on YCSB. We run YCSB as part of our performance regression environment. We&apos;ve reclaimed some of the regression, and have&#160;accepted the remaining regressions at this point. I&apos;m going to close this ticket as Won&apos;t Fix for now. If you disagree and would like to discuss more, please feel free to reopen.&#160;&lt;/p&gt;</comment>
                            <comment id="1997013" author="jun.kim" created="Fri, 7 Sep 2018 22:36:47 +0000"  >&lt;p&gt;thanks for the comment.&lt;/p&gt;

&lt;p&gt;I am just on boarding at MongoDB ( one month ). I really don&apos;t know what kind of process we have to fix the regression.  Could you let me know there is a process to fix the regression now or future release. &lt;/p&gt;
</comment>
                            <comment id="1985978" author="jun.kim" created="Mon, 27 Aug 2018 02:38:36 +0000"  >&lt;p&gt;Also I tested by own env. &lt;br/&gt;
here is my test result too.  &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/194750/194750_Performance+Test.key&quot; title=&quot;Performance Test.key attached to SERVER-36875&quot;&gt;Performance Test.key&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;</comment>
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            <issuekey id="532172">SERVER-34604</issuekey>
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                            <attachment id="194750" name="Performance Test.key" size="1041737" author="jun.kim@mongodb.com" created="Mon, 27 Aug 2018 02:38:27 +0000"/>
                            <attachment id="194749" name="result1.jpg" size="117889" author="jun.kim@mongodb.com" created="Mon, 27 Aug 2018 02:35:07 +0000"/>
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                            <attachment id="194746" name="testscript.jpg" size="54434" author="jun.kim@mongodb.com" created="Mon, 27 Aug 2018 02:35:07 +0000"/>
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