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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-20327] Query Performance Regression in Mongo-Perf</title>
                <link>https://jira.mongodb.org/browse/SERVER-20327</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;WT Standalone variant query is &lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_standalone_query_7a59ba6da674462e7f86a3a7111d58b0721a4138_15_09_03_23_57_34##%7B%22hiddenGraphs%22:%5B%22Queries.PartialIndex.FilteredRange%22,%22Queries.PartialIndex.NonFilteredRange%22,%22Queries.PartialIndex.FullRange%22,%22Queries.PartialIndex.AllInFilter.FilteredRange%22,%22Queries.PartialIndex.AllInFilter.FullRange%22,%22Queries.UniqueIdx.HaveNonUniqueIndices%22,%22Queries.UniqueIdx.MultipleUniqueIndices%22,%22Queries.UniqueIdx.MultikeyWithUniqueIdx%22,%22Queries.UniqueIdx.ManyIdxIsect%22,%22Queries.UniqueIdx.ManyIdxIsectRangePredicates%22,%22Queries.Empty%22,%22Queries.NoMatch%22,%22Queries.IntNonIdFindOne%22,%22Queries.IntIDRange%22,%22Queries.RegexPrefixFindOne%22,%22Queries.IntNonIdFindOneProjectionCovered%22,%22Queries.IntNonIdFindOneProjection%22,%22Queries.FindProjection%22,%22Queries.FindWideDocProjection%22,%22Queries.FindProjectionThreeFieldsCovered%22,%22Queries.FindProjectionThreeFields%22,%22Queries.FindProjectionDottedField%22,%22Queries.FindProjectionDottedField.Indexed%22,%22Queries.Text.FindSingleCaseSensitive%22,%22Queries.Text.FindThreeWordsCaseSensitive%22,%22Queries.Text.FindPhraseCaseSensitive%22%5D%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;failing&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;Two tests flagged:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Queries.IntIdFindOne&lt;/li&gt;
	&lt;li&gt;Queries.IntNonIdFindProjectCovered&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Other tests not flagged, but looked regressed from visual inspection&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Queries.TwoInts&lt;/li&gt;
	&lt;li&gt;Queries.Text.FindSingle&lt;/li&gt;
	&lt;li&gt;Queries.Text.FindThreeWords&lt;/li&gt;
	&lt;li&gt;Queries.Text.FindPhrase&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Those tests are not failing on MMAP, but that looks like it may be due to higher noise margins on the MMAP &lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_mmap_standalone_query_7a59ba6da674462e7f86a3a7111d58b0721a4138_15_09_03_23_57_34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tests&lt;/a&gt;. &lt;/p&gt;</description>
                <environment></environment>
        <key id="228455">SERVER-20327</key>
            <summary>Query Performance Regression in Mongo-Perf</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="9">Done</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="david.daly@mongodb.com">David Daly</reporter>
                        <labels>
                            <label>mpreg</label>
                    </labels>
                <created>Fri, 4 Sep 2015 13:48:03 +0000</created>
                <updated>Fri, 5 Feb 2016 14:29:31 +0000</updated>
                            <resolved>Mon, 12 Oct 2015 15:33:02 +0000</resolved>
                                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Performance</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1037098" author="xgen-internal-githook" created="Fri, 18 Sep 2015 18:22:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20327&quot; title=&quot;Query Performance Regression in Mongo-Perf&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20327&quot;&gt;&lt;del&gt;SERVER-20327&lt;/del&gt;&lt;/a&gt; Don&apos;t copy indexes catalog entry to array before parsing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1aec175308cb91b43efd6bafc145054222db7748&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1aec175308cb91b43efd6bafc145054222db7748&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1027019" author="xgen-internal-githook" created="Fri, 11 Sep 2015 01:03:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20327&quot; title=&quot;Query Performance Regression in Mongo-Perf&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20327&quot;&gt;&lt;del&gt;SERVER-20327&lt;/del&gt;&lt;/a&gt; Don&apos;t check index catalog when recording usage stats&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8b205afd0ae74fd7351bc183e39b8931044f3987&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8b205afd0ae74fd7351bc183e39b8931044f3987&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1025198" author="david.daly" created="Wed, 9 Sep 2015 15:02:07 +0000"  >&lt;p&gt;From off-line discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin&quot;&gt;james.wahlin&lt;/a&gt; it seems he has a good lead on this now. Moved to SERVER and assigning to James to continue on. &lt;/p&gt;</comment>
                            <comment id="1024392" author="david.daly" created="Tue, 8 Sep 2015 18:43:11 +0000"  >&lt;p&gt;I can reproduce this on my local linux box now on Queries.IntIdFindOne, but it is fairly sensitive. In order to reproduce it, I had to pin the mongod processes to certain cores, and the mongo-perf to other cores. I also have hyperthreading and frequency scaling off on my linux box to match the evergreen environment. &lt;/p&gt;

&lt;p&gt;I also think this is showing up in other mongo-perf test suites, sometimes just above 5% and sometimes just below, causing the tests to change from red to green and back. Other tests include &lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Insert.IntIDUpsert from the insert suite (upsert)  (more visible on mmap that WT)&lt;/li&gt;
	&lt;li&gt;Mixed.FindOneUpdateIntId-50-50 for mmap&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin&quot;&gt;james.wahlin&lt;/a&gt; I&apos;m beginning to things this is real, but not sure how to proceed on it because of the restrictions needed to repro. Are there useful stats I could collect for you on this from serverStatus or something else? Is there a possibility that this would get worse with higher core counts and threading (i.e., more contention on the stats?)&lt;/p&gt;</comment>
                            <comment id="1022918" author="david.daly" created="Fri, 4 Sep 2015 20:40:21 +0000"  >&lt;p&gt;This is visible in &lt;a href=&quot;https://github.com/mongodb/mongo/commit/ae9df7fb11cf359686699aeb9539cb6dc35de675&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ae9df7fb11&lt;/a&gt;. Running one more commit before that, but don&apos;t expect the regression to be present there. &lt;/p&gt;</comment>
                            <comment id="1022551" author="david.daly" created="Fri, 4 Sep 2015 14:23:33 +0000"  >&lt;p&gt;First visible in commit ce660e56d9. There are 5 previous commits that didn&apos;t run. Scheduling likely ones. &lt;/p&gt;</comment>
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