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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-27175] Address slowness in Explain::getPlanSummary</title>
                <link>https://jira.mongodb.org/browse/SERVER-27175</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While profiling mongod under VTune, running the Queries.IntNonIdFindOn mongo-perf test with 8 threads I found that roughly 6% of the FindCmd run time is spent in Explain::getPlanSummary, generating a plan summary string. Of this 6%, 2/3rds is spent in StringBuilderImpl::appendDoubleNice(), converting index direction (in this case the number 1) from double to string.&lt;/p&gt;

&lt;p&gt;We should look to optimize this path, either with StringBuilder optimization or custom parsing in getPlanSummary.&lt;/p&gt;

&lt;p&gt;It is worth noting that changing the createIndex call in &quot;Queries.IntNonIdFindOn&quot; to pass a NumberInt(1) rather than the default of double reduces the cost by 50%. The remaining 50% is spent in StringBuilderImpl operator&amp;lt;&amp;lt;(int) which could be optimized for small integers as was done in our itoa() implementation.&lt;/p&gt;

&lt;p&gt;See attachment for VTune screenshot&lt;/p&gt;</description>
                <environment></environment>
        <key id="333968">SERVER-27175</key>
            <summary>Address slowness in Explain::getPlanSummary</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="9">Done</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Nov 2016 19:18:26 +0000</created>
                <updated>Wed, 5 Apr 2017 11:42:31 +0000</updated>
                            <resolved>Tue, 27 Dec 2016 21:30:52 +0000</resolved>
                                                    <fixVersion>3.4.2</fixVersion>
                    <fixVersion>3.5.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1472522" author="xgen-internal-githook" created="Mon, 9 Jan 2017 14:41:41 +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-27175&quot; title=&quot;Address slowness in Explain::getPlanSummary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27175&quot;&gt;&lt;del&gt;SERVER-27175&lt;/del&gt;&lt;/a&gt; Improve performance of planSummary string generation&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ac7b0469bdb57a3593dc8b97e5a7045db0efbb24)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eb8c2542fd7f3881ae0dbf0f89a1293410de95bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eb8c2542fd7f3881ae0dbf0f89a1293410de95bc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1465617" author="xgen-internal-githook" created="Tue, 27 Dec 2016 21:29:32 +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-27175&quot; title=&quot;Address slowness in Explain::getPlanSummary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27175&quot;&gt;&lt;del&gt;SERVER-27175&lt;/del&gt;&lt;/a&gt; Improve performance of planSummary string generation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac7b0469bdb57a3593dc8b97e5a7045db0efbb24&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac7b0469bdb57a3593dc8b97e5a7045db0efbb24&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1443658" author="james.wahlin@10gen.com" created="Mon, 28 Nov 2016 18:47:49 +0000"  >&lt;p&gt;One means of addressing this outside of the getPlanSummary path would be to do the following:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Add StringBuilder optimizations for small integer values (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27193&quot; title=&quot;Consider adding &amp;quot;small integer&amp;quot; optimizations to Stringbuilder&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27193&quot;&gt;&lt;del&gt;SERVER-27193&lt;/del&gt;&lt;/a&gt;).&lt;/li&gt;
	&lt;li&gt;Force index direction (1, -1) to be of type integer. We currently support both double and integer types. Even without &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27193&quot; title=&quot;Consider adding &amp;quot;small integer&amp;quot; optimizations to Stringbuilder&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27193&quot;&gt;&lt;del&gt;SERVER-27193&lt;/del&gt;&lt;/a&gt; there is savings to be had by this change.&lt;/li&gt;
&lt;/ol&gt;
</comment>
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                            <attachment id="144709" name="vtune_Queries_IntNonIdFindOn.png" size="149948" author="james.wahlin@mongodb.com" created="Wed, 23 Nov 2016 18:23:36 +0000"/>
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