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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-74471] Prune existing tests to stabilize the signal from the change stream perf suite</title>
                <link>https://jira.mongodb.org/browse/SERVER-74471</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;For the&#160;&lt;tt&gt;change_stream_latency&lt;/tt&gt;&#160;tests and its derivatives, run only a single configuration: 1KB documents, ~24 worker threads, 1 collection, 1 change stream. Keep the pre-image variants, consider similarly splitting the&#160;&lt;tt&gt;updateLookup&lt;/tt&gt;&#160;test into its own variant. Consider getting rid of the&#160;&lt;tt&gt;findOne&lt;/tt&gt;&#160;worker since that just adds load with no direct impact on the test.&lt;/li&gt;
	&lt;li&gt;Consider getting rid of the&#160;&lt;tt&gt;change_stream_throughput&lt;/tt&gt;&#160;tests entirely. These don&apos;t measure anything to do with change streams itself, but instead measure the impact of increasing numbers of change streams on an ongoing read/write workload. One benefit of having these tests around is that they can be correlated against the corresponding&#160;&lt;tt&gt;change_stream_latency&lt;/tt&gt;&#160;tests; if write throughput improves, change streams latency regresses. But we could get the same information by simply recording write throughput in the&#160;&lt;tt&gt;change_stream_latency&lt;/tt&gt;&#160;tests.&lt;/li&gt;
	&lt;li&gt;Consider extending the&#160;&lt;tt&gt;change_stream_listen_throughput&lt;/tt&gt;&#160;test, which is currently insert-only, with mixed-workload,&#160;&lt;tt&gt;updateLookup&lt;/tt&gt;&#160;and pre-image variants. This doesn&apos;t have to happen under this ticket, since it would involve adding new tests rather than reworking the current ones.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/PERF-3139?focusedCommentId=5215970&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-5215970&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Bernard&apos;s comment&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2278207">SERVER-74471</key>
            <summary>Prune existing tests to stabilize the signal from the change stream perf suite</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="13201">Fixed</resolution>
                                        <assignee username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</assignee>
                                    <reporter username="sebastien.mendez@mongodb.com">Sebastien Mendez</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Mar 2023 11:13:46 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:34 +0000</updated>
                            <resolved>Tue, 16 May 2023 10:48:16 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                    <fixVersion>6.0.7</fixVersion>
                    <fixVersion>5.0.19</fixVersion>
                    <fixVersion>4.4.23</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5427403" author="xgen-internal-githook" created="Tue, 16 May 2023 08:58:42 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74471&quot; title=&quot;Prune existing tests to stabilize the signal from the change stream perf suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74471&quot;&gt;&lt;del&gt;SERVER-74471&lt;/del&gt;&lt;/a&gt; Prune change stream perf tests to reduce variability of the performance measurements&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2c6f59b45bda42dc323c5f1cab8dd36da96c1783&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2c6f59b45bda42dc323c5f1cab8dd36da96c1783&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5427399" author="xgen-internal-githook" created="Tue, 16 May 2023 08:57:01 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74471&quot; title=&quot;Prune existing tests to stabilize the signal from the change stream perf suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74471&quot;&gt;&lt;del&gt;SERVER-74471&lt;/del&gt;&lt;/a&gt; Prune change stream perf tests to reduce variability of the performance measurements&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b728afb9e22c177765e71a0f6d21d5405dbf06ff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b728afb9e22c177765e71a0f6d21d5405dbf06ff&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5425782" author="xgen-internal-githook" created="Mon, 15 May 2023 17:21:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74471&quot; title=&quot;Prune existing tests to stabilize the signal from the change stream perf suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74471&quot;&gt;&lt;del&gt;SERVER-74471&lt;/del&gt;&lt;/a&gt; Prune change stream perf tests to reduce variability of the performance measurements&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 837d5a5db797a3f192ff8a087725189bf445c945)&lt;br/&gt;
(cherry picked from commit 56b20700fb7c2e31d8a5d413f278ce4595d54b4c)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cb0756c83697618126a79cb4e3a04d69ee9ea9d1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cb0756c83697618126a79cb4e3a04d69ee9ea9d1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5393473" author="xgen-internal-githook" created="Tue, 2 May 2023 11:41:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74471&quot; title=&quot;Prune existing tests to stabilize the signal from the change stream perf suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74471&quot;&gt;&lt;del&gt;SERVER-74471&lt;/del&gt;&lt;/a&gt; Prune change stream perf tests to reduce variability of the performance measurements&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 837d5a5db797a3f192ff8a087725189bf445c945)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/56b20700fb7c2e31d8a5d413f278ce4595d54b4c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/56b20700fb7c2e31d8a5d413f278ce4595d54b4c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5374962" author="xgen-internal-githook" created="Tue, 25 Apr 2023 19:24:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74471&quot; title=&quot;Prune existing tests to stabilize the signal from the change stream perf suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74471&quot;&gt;&lt;del&gt;SERVER-74471&lt;/del&gt;&lt;/a&gt; Prune change stream perf tests to reduce variability of the performance measurements&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/837d5a5db797a3f192ff8a087725189bf445c945&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/837d5a5db797a3f192ff8a087725189bf445c945&lt;/a&gt;&lt;/p&gt;</comment>
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