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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-35994] Reduce CPU load in secondary_reads_unique_indexes.js test</title>
                <link>https://jira.mongodb.org/browse/SERVER-35994</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;secondary_reads_unique_indexes.js&lt;/tt&gt; test starts up 16 reader threads, each using its own mongo shell process, and does &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/replsets/secondary_reads_unique_indexes.js#L63-L69&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;multiple reads repeatedly&lt;/a&gt;. This can incur very high CPU usage on a machine. The high load appears to be generated primarily by the mongo shell processes, not the mongod nodes. &lt;/p&gt;

&lt;p&gt;For example, running this test on a 12 core Linux workstation nearly maxed out all cores when the reader threads were running. We should consider adding some short sleeps to these read loops in an attempt to make this test less intensive. This will reduce the likelihood of it locking up a machine when running with other tests concurrently.&lt;/p&gt;</description>
                <environment></environment>
        <key id="568697">SERVER-35994</key>
            <summary>Reduce CPU load in secondary_reads_unique_indexes.js test</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Jul 2018 17:25:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:30:05 +0000</updated>
                            <resolved>Fri, 6 Jul 2018 20:14:21 +0000</resolved>
                                                    <fixVersion>4.0.1</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1941024" author="xgen-internal-githook" created="Fri, 6 Jul 2018 20:15:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;will62794&apos;, &apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35994&quot; title=&quot;Reduce CPU load in secondary_reads_unique_indexes.js test&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35994&quot;&gt;&lt;del&gt;SERVER-35994&lt;/del&gt;&lt;/a&gt; Reduce CPU load in secondary_reads_unique_indexes.js test&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 567676b888c6372c46d6e2507df2bb91546b743b)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/de81cb94239caa6529d0aece7791c860cbb8a371&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/de81cb94239caa6529d0aece7791c860cbb8a371&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1941020" author="xgen-internal-githook" created="Fri, 6 Jul 2018 20:13:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;will62794&apos;, &apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35994&quot; title=&quot;Reduce CPU load in secondary_reads_unique_indexes.js test&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35994&quot;&gt;&lt;del&gt;SERVER-35994&lt;/del&gt;&lt;/a&gt; Reduce CPU load in secondary_reads_unique_indexes.js test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/567676b888c6372c46d6e2507df2bb91546b743b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/567676b888c6372c46d6e2507df2bb91546b743b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1940804" author="louis.williams" created="Fri, 6 Jul 2018 17:44:35 +0000"  >&lt;p&gt;I think adding short sleeps would be fine if to help reduce test failures. The test was designed to catch one potential regression of secondary reads, but there are other tests that would definitely catch errors even if this test didn&apos;t.&lt;/p&gt;</comment>
                            <comment id="1940770" author="william.schultz" created="Fri, 6 Jul 2018 17:29:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=louis.williams&quot; class=&quot;user-hover&quot; rel=&quot;louis.williams&quot;&gt;louis.williams&lt;/a&gt; Would you see any problem in doing this? i.e. adding short (possible randomized) sleeps at the end of each for-loop iteration &lt;a href=&quot;https://github.com/mongodb/mongo/blob/71d5df6f46dc50b75f8b7846f51e398f82f5e3a4/jstests/replsets/secondary_reads_unique_indexes.js#L63-L70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. It seems that what matters for this test would be the ordering of a read relative to a batch application. The overall frequency of the secondary reads seems less important (i.e. how long they wait between issuing new reads). &lt;/p&gt;</comment>
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