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    <title>MongoDB Jira</title>
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    <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>[GODRIVER-2021] Operation.createMsgWireMessage() allocates memory inefficiently</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-2021</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/blob/7790c430f46470916eb661e1d4c34acb13a19b29/x/mongo/driver/operation.go#L949-L951&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This loop&lt;/a&gt; in Operation.createMsgWireMessage() is inefficient:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; _, doc := range op.Batches.Current {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    dst = append(dst, doc...)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;since dst is not at the required cap before the loop, it causes multiple allocations and the final cap of dst can be up to 2x larger than needed.&lt;/p&gt;

&lt;p&gt;Calculating the total length of batches in op.Batches.Current and resizing dst before the loop would be more efficient.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;%C2%A0&quot;&gt;&lt;/a&gt;&#160;&lt;/h3&gt;</description>
                <environment></environment>
        <key id="1751157">GODRIVER-2021</key>
            <summary>Operation.createMsgWireMessage() allocates memory inefficiently</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="qingyang.hu@mongodb.com">Qingyang Hu</assignee>
                                    <reporter username="tim.fogarty@mongodb.com">Tim Fogarty</reporter>
                        <labels>
                    </labels>
                <created>Sun, 23 May 2021 19:56:38 +0000</created>
                <updated>Sat, 28 Oct 2023 11:37:47 +0000</updated>
                            <resolved>Thu, 8 Sep 2022 18:01:20 +0000</resolved>
                                    <version>1.5.2</version>
                                    <fixVersion>1.11.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4807785" author="xgen-internal-githook" created="Wed, 7 Sep 2022 13:15:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Qingyang Hu&apos;, &apos;email&apos;: &apos;103950869+qingyang-hu@users.noreply.github.com&apos;, &apos;username&apos;: &apos;qingyang-hu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/GODRIVER-2021&quot; title=&quot;Operation.createMsgWireMessage() allocates memory inefficiently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;GODRIVER-2021&quot;&gt;&lt;del&gt;GODRIVER-2021&lt;/del&gt;&lt;/a&gt; Use pooling to reduce memory allocation. (#1053)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-go-driver/commit/988abba6f907f562fdb944577f956cb7cd794b37&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-go-driver/commit/988abba6f907f562fdb944577f956cb7cd794b37&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1400175">GODRIVER-1670</issuekey>
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