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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-42712] Improve copy assignment performance of KeyString::Value</title>
                <link>https://jira.mongodb.org/browse/SERVER-42712</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Copy assignment of KeyString::Value is currently slow for a few reasons:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;It must call the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/774262f853535757aae4ca74a6617fe9a5b49000/src/mongo/db/storage/key_string.cpp#L2127&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;copy assignment for TypeBits&lt;/a&gt;, preventing the structure&apos;s assignment from being inlined efficiently. This can be improved by transparently always appending TypeBits to the end of the buffer, but never including it in the actual KeyString.&lt;/li&gt;
	&lt;li&gt;It must&#160;call the destructor for the local ConstSharedBuffer, and created a copy of the source buffer, subtracting and adding an atomic ref-counter on each. This shows up in perf and can be improved by implementing a swapping assignment like &lt;a href=&quot;https://github.com/mongodb/mongo/blob/774262f853535757aae4ca74a6617fe9a5b49000/src/mongo/bson/bsonobj.h#L160&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;BSON does today&lt;/a&gt;.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="887888">SERVER-42712</key>
            <summary>Improve copy assignment performance of KeyString::Value</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Aug 2019 18:45:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:15 +0000</updated>
                            <resolved>Tue, 20 Aug 2019 20:04:55 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2379656" author="xgen-internal-githook" created="Tue, 20 Aug 2019 19:44:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42712&quot; title=&quot;Improve copy assignment performance of KeyString::Value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42712&quot;&gt;&lt;del&gt;SERVER-42712&lt;/del&gt;&lt;/a&gt; Improve KeyString::Value copy assignemnt&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c1bd6bb98e189d33ca7e044d549d1be2a11be20d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c1bd6bb98e189d33ca7e044d549d1be2a11be20d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2379254" author="xgen-internal-githook" created="Tue, 20 Aug 2019 16:44:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42712&quot; title=&quot;Improve copy assignment performance of KeyString::Value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42712&quot;&gt;&lt;del&gt;SERVER-42712&lt;/del&gt;&lt;/a&gt; Improve KeyString::Value copy assignemnt&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit cb3704ac02751e6369db7333e04ed54ab748f6da.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/36aacf391a13eba67648f1cf625fe26515454a70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/36aacf391a13eba67648f1cf625fe26515454a70&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2379229" author="xgen-internal-githook" created="Tue, 20 Aug 2019 16:34:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42712&quot; title=&quot;Improve copy assignment performance of KeyString::Value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42712&quot;&gt;&lt;del&gt;SERVER-42712&lt;/del&gt;&lt;/a&gt; Improve KeyString::Value copy assignemnt&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cb3704ac02751e6369db7333e04ed54ab748f6da&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cb3704ac02751e6369db7333e04ed54ab748f6da&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2379227" author="xgen-internal-githook" created="Tue, 20 Aug 2019 16:34:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42712&quot; title=&quot;Improve copy assignment performance of KeyString::Value&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42712&quot;&gt;&lt;del&gt;SERVER-42712&lt;/del&gt;&lt;/a&gt; Add benchmarks for KeyString releasing, copying, and assignment&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/910ce4061d9496c9b9736a538c17ad0e3a1d706b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/910ce4061d9496c9b9736a538c17ad0e3a1d706b&lt;/a&gt;&lt;/p&gt;</comment>
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