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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-42695] M/R Agg: Compare performance against legacy implementation and investigate regressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-42695</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="886974">SERVER-42695</key>
            <summary>M/R Agg: Compare performance against legacy implementation and investigate regressions</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="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Aug 2019 21:08:23 +0000</created>
                <updated>Fri, 10 Jan 2020 14:14:38 +0000</updated>
                            <resolved>Thu, 12 Dec 2019 19:13:37 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2602664" author="james.wahlin@10gen.com" created="Thu, 12 Dec 2019 21:22:46 +0000"  >&lt;p&gt;Worth noting is that the above results all represent a single-threaded client performance workload. It turns out that our mapReduce sys-perf tests would need to be modified to support a multiple client thread test. The impact of this is that we will not see the gains we expect from no longer taking a global write lock when M/R writes to an output collection.&lt;/p&gt;</comment>
                            <comment id="2602350" author="nicholas.zolnierz" created="Thu, 12 Dec 2019 19:13:11 +0000"  >&lt;p&gt;Final sys-perf patch build is &lt;a href=&quot;https://evergreen.mongodb.com/version/5df2540e850e61039ffb836c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, which includes that commit that removed the feature flag as well as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44334&quot; title=&quot;Make ProjectionExecutor faster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44334&quot;&gt;&lt;del&gt;SERVER-44334&lt;/del&gt;&lt;/a&gt; from above.&#160;Note that the base commit also includes the feature flag removal, so its best to compare against an older commit (e.g. 1f5591c7a060cc9a048462b618e2ca7c767036c3 for standalone). To summarize the results:&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Standalone&lt;/b&gt;&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Test&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Max&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;max @1f5591c&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;vs&#160;1f5591c&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_inline&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;68,447&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;93,249&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-26.60%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_reduce&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;65,441&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;86,210&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-24.09%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_merge&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;65,930&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;86,378&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-23.67%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_replace&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;65,067&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;85,473&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-23.87%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;word_count_doc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;17,589&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;30,685&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-42.68%&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;&#160;&lt;b&gt;Shard-lite cluster (bestbuy only)&lt;/b&gt;&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
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&lt;th class=&apos;confluenceTh&apos;&gt;Max&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;max @7290512&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;vs&#160;7290512&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;filtered_word_count_map_reduce&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5,267&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;3,334&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;57.98%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;all_word_count_map_reduce&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2,622&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;1,200&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;118.48%&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;&#160;&lt;b&gt;3-shard cluster&lt;/b&gt;&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Test&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Max&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;max @64a9f0d&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;vs&#160;64a9f0d&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_inline&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;145,378&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;178,192&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-18.42%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_reduce&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;143,321&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;179,293&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-20.06%&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_merge&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;142,867&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;178,479&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-19.95%&lt;/td&gt;
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&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;map_reduce_doc_replace&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;141,511&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;180,987&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-21.81%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;word_count_doc&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;45,994&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;43,763&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;5.10%&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;&#160;AFAIK, these results include any relevant perf fixes from the &quot;Unity projection implementation&quot; project as well as any perf improvements from the M/R in agg project. Mostly posting the numbers for posterity as we don&apos;t plan to spend any additional time on this as part of PM-766.&#160;&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="886944">SERVER-42680</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="915373">SERVER-43796</issuekey>
        </issuelink>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                                        </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="981262">SERVER-44284</issuekey>
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                            <attachment id="235134" name="mr_agg_10.svg" size="724958" author="nicholas.zolnierz@mongodb.com" created="Wed, 23 Oct 2019 20:10:01 +0000"/>
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