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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-31998] Perf regression with mongodump integration tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-31998</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When running the mongodump integration tests, I noticed a significant performance difference between 3.4.10 replica sets (WT) and 3.6.0-rc4 replica sets (both WT and MMAPv1).  On my MBP, the difference was 50% to 100%+.  On my 20-core desktop, the difference was ~ 18%.  The workloads involved are tiny.&lt;/p&gt;</description>
                <environment>darwin Sierra, linux Ubuntu 17.10</environment>
        <key id="459810">SERVER-31998</key>
            <summary>Perf regression with mongodump integration tests</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="david.golden@mongodb.com">David Golden</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Nov 2017 16:04:05 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:05 +0000</updated>
                            <resolved>Fri, 5 Jan 2018 15:18:56 +0000</resolved>
                                    <version>3.6.0-rc4</version>
                                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1766094" author="ian@10gen.com" created="Fri, 5 Jan 2018 15:18:56 +0000"  >&lt;p&gt;Thanks for filing this David.  We&apos;re closing as Works as Designed because:&lt;/p&gt;

&lt;p&gt;1) We&apos;re just doing more work in the drop/create code paths given the two-phase drops.&lt;br/&gt;
2) The size of the workload is somewhat synthetic and means the percentage you&apos;re seeing is abnormally large.  On a larger dataset we&apos;d expect a much smaller percentage.&lt;/p&gt;</comment>
                            <comment id="1752657" author="redbeard0531" created="Thu, 14 Dec 2017 22:53:58 +0000"  >&lt;p&gt;My initial profiling indicated that this workload spends the majority of its time dropping and creating databases. Pushing to storage team to decide how/if we want to address this.&lt;/p&gt;</comment>
                            <comment id="1728017" author="david.golden" created="Thu, 16 Nov 2017 19:03:23 +0000"  >&lt;p&gt;Added output for the two configurations as tested on Ubuntu 17.10.  Each file shows the command line parameters for the nodes and the timing results of two runs.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="171141" name="output-3.4.10.txt" size="8026" author="david.golden@mongodb.com" created="Thu, 16 Nov 2017 19:01:42 +0000"/>
                            <attachment id="171142" name="output-3.6.0-rc4.txt" size="8041" author="david.golden@mongodb.com" created="Thu, 16 Nov 2017 19:01:42 +0000"/>
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	&lt;li&gt;Install Go (my test used Go 1.9.2)&lt;/li&gt;
	&lt;li&gt;Clone the &lt;a href=&quot;https://github.com/mongodb/mongo-tools&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongo-tools repo&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;cd&lt;/tt&gt; into the directory and check out commit &lt;a href=&quot;https://github.com/mongodb/mongo-tools/commit/9c973cbf38b4c396014c453a6e8d49c913c4ffd9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;9c973cbf&lt;/a&gt;&lt;/li&gt;
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	&lt;li&gt;Set the &lt;tt&gt;MONGOD&lt;/tt&gt; environment variable to a MongoDB connection string URI for the replica set to test&lt;/li&gt;
	&lt;li&gt;Run `&lt;tt&gt;time go test -v ./mongodump -test.types=unit,integration&lt;/tt&gt;`&lt;/li&gt;
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