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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-83715] Reserve vector size ahead of time when using DocumentSequences in generated IDL Parser</title>
                <link>https://jira.mongodb.org/browse/SERVER-83715</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using DocumentSequences, we already know the size of the array to be deserialized ahead of time. This is because the DocumentSequence is stored as a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8b9f57f6dd949eb10363fff1d6718858ac5fc09/src/mongo/rpc/op_msg.h#L75&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;std::vector within OpMsg&lt;/a&gt;. This is different from when the array is within the BSON body, in which case there is no way to know the size of the array without actually iterating through it.&lt;/p&gt;

&lt;p&gt;The IDL parser generator can be changed &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8b9f57f6dd949eb10363fff1d6718858ac5fc09/buildscripts/idl/idl/generator.py#L1674-L1680&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; to include a &lt;tt&gt;values.reserve(sequence.objs.size())&lt;/tt&gt; call, so that when we are using DocumentSequences we don&apos;t have to perform vector reallocations due to not reserving the correct size ahead of time.&lt;/p&gt;

&lt;p&gt;There may be additional scope for improvement here. Please investigate that as well&lt;/p&gt;

&lt;p&gt;In bulkWrite perf investigations, this made a 10% difference.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2512166">SERVER-83715</key>
            <summary>Reserve vector size ahead of time when using DocumentSequences in generated IDL Parser</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="13201">Fixed</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="vishnu.kaushik@mongodb.com">Vishnu Kaushik</reporter>
                        <labels>
                            <label>perf</label>
                    </labels>
                <created>Wed, 29 Nov 2023 18:01:54 +0000</created>
                <updated>Tue, 2 Jan 2024 19:10:34 +0000</updated>
                            <resolved>Tue, 2 Jan 2024 19:10:33 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5980629" author="xgen-internal-githook" created="Tue, 2 Jan 2024 17:53:39 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Billy Donahue&apos;, &apos;email&apos;: &apos;BillyDonahue@users.noreply.github.com&apos;, &apos;username&apos;: &apos;BillyDonahue&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83715&quot; title=&quot;Reserve vector size ahead of time when using DocumentSequences in generated IDL Parser&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83715&quot;&gt;&lt;del&gt;SERVER-83715&lt;/del&gt;&lt;/a&gt; reserve document sequence vector (#17817)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: f0f89fb4670ae0bddd7f114825b8aa269fc25316&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd7b44a140d9ad3ce54ed9de9eecb637270471a0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd7b44a140d9ad3ce54ed9de9eecb637270471a0&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2497284">SERVER-83148</issuekey>
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