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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26129] Investigate perf overhead of collation</title>
                <link>https://jira.mongodb.org/browse/SERVER-26129</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should write some performance tests to investigate the performance of a query using a collation that involves lots of string comparisons, and compare it to the same without a collation.&lt;/p&gt;

&lt;p&gt;We expect the worst cases to be in SORT stages and filters which involve string comparisons and are not provided by an index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="316549">SERVER-26129</key>
            <summary>Investigate perf overhead of collation</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Sep 2016 19:37:42 +0000</created>
                <updated>Thu, 13 Oct 2016 18:57:28 +0000</updated>
                            <resolved>Thu, 13 Oct 2016 18:57:28 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1407790" author="david.storch" created="Thu, 13 Oct 2016 18:57:19 +0000"  >&lt;p&gt;Performance regression tests have been added to mongo-perf. See tests with the &quot;collation&quot; label in the following files:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-perf/blob/develop/testcases/simple_query.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-perf/blob/develop/testcases/simple_query.js&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-perf/blob/develop/testcases/simple_insert.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-perf/blob/develop/testcases/simple_insert.js&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Initial performance testing shows that nearly all of the additional work spent for collation is for generating collator comparison keys. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26621&quot; title=&quot;Make in-memory sorts use CollatorInterface::compare() rather than CollatorInterface::getComparisonKey()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26621&quot;&gt;SERVER-26621&lt;/a&gt; for an idea of how to spend less time building comparison keys. I&apos;m closing this ticket as &quot;Won&apos;t Fix&quot;, since there is no specific further development work planned.&lt;/p&gt;</comment>
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