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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>
    </build-info>


<item>
            <title>[SERVER-32302] for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code</title>
                <link>https://jira.mongodb.org/browse/SERVER-32302</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As a part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30761&quot; title=&quot;Optimize parsing code for top-level MatchExpressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30761&quot;&gt;&lt;del&gt;SERVER-30761&lt;/del&gt;&lt;/a&gt;, we refactored &lt;tt&gt;parseInExpression()&lt;/tt&gt; and changed a loop that looked like&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;while&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; (iter.more()) {&lt;/span&gt;&lt;/pre&gt;
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					&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;    auto e = iter.next();&lt;/span&gt;&lt;/pre&gt;
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					&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;    &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// ...&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   margin-bottom: 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;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;into&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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		&lt;tbody &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; (auto e : theArray) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;    &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// ...&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;   margin-bottom: 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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;This has caused a performance regression of roughly 5% when parsing a &lt;tt&gt;$in&lt;/tt&gt;, and is apparent with very large in expressions. The real fix seems like achieving performance parity between the two ways to iterate through a &lt;tt&gt;BSONObj&lt;/tt&gt;, but I&apos;m not sure how much we want to dive down the rabbit hole in terms of seeing the machine code that&apos;s generated by the two constructs.&lt;/p&gt;</description>
                <environment></environment>
        <key id="471703">SERVER-32302</key>
            <summary>for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Dec 2017 16:36:10 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:57 +0000</updated>
                            <resolved>Thu, 4 Jan 2018 20:45:39 +0000</resolved>
                                    <version>3.6.0</version>
                                    <fixVersion>3.6.7</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1954236" author="xgen-internal-githook" created="Mon, 23 Jul 2018 20:59:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;RedBeard0531&apos;, &apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Make mutablebson cache total field size&lt;/p&gt;

&lt;p&gt;This addresses the perf regression in update due to eagerly computing the&lt;br/&gt;
field size in BSONElement&apos;s constructor.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d30abf7c53a992635d82b226acbb649106f5dfa2)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/468ea92542149779247925bc56f6b340246c4329&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/468ea92542149779247925bc56f6b340246c4329&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1954235" author="xgen-internal-githook" created="Mon, 23 Jul 2018 20:59:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;RedBeard0531&apos;, &apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Use a table to compute the size of each BSONElement&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3c586a7c946ac7f9485b9ff978fa029ac4b5108e)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/503a10907758b19a66c7e3bc06aedc32ecae5dcb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/503a10907758b19a66c7e3bc06aedc32ecae5dcb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1954234" author="xgen-internal-githook" created="Mon, 23 Jul 2018 20:59:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;RedBeard0531&apos;, &apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Compute BSONElement sizes eagerly&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0d38ef54970744aca3565fabbda76bd6e7836f7a)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca6228daa963e5c0ea5df680206f82dd73eb2fd2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca6228daa963e5c0ea5df680206f82dd73eb2fd2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1954233" author="xgen-internal-githook" created="Mon, 23 Jul 2018 20:59:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;RedBeard0531&apos;, &apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Introduce BSONObjStlIterator as a proper stl-style iterator&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1497899f237dd60ad7313913c38c3f07fe168f2b)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e64cf49efa5410aafdbf1a837070563abcf41fb2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e64cf49efa5410aafdbf1a837070563abcf41fb2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1765397" author="xgen-internal-githook" created="Thu, 4 Jan 2018 20:03:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Make mutablebson cache total field size&lt;/p&gt;

&lt;p&gt;This addresses the perf regression in update due to eagerly computing the&lt;br/&gt;
field size in BSONElement&apos;s constructor.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d30abf7c53a992635d82b226acbb649106f5dfa2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d30abf7c53a992635d82b226acbb649106f5dfa2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1765396" author="xgen-internal-githook" created="Thu, 4 Jan 2018 20:03:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Use a table to compute the size of each BSONElement&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3c586a7c946ac7f9485b9ff978fa029ac4b5108e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3c586a7c946ac7f9485b9ff978fa029ac4b5108e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1765395" author="xgen-internal-githook" created="Thu, 4 Jan 2018 20:03:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Compute BSONElement sizes eagerly&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d38ef54970744aca3565fabbda76bd6e7836f7a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0d38ef54970744aca3565fabbda76bd6e7836f7a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1765394" author="xgen-internal-githook" created="Thu, 4 Jan 2018 20:03:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mathias Stearn&apos;, &apos;username&apos;: &apos;RedBeard0531&apos;, &apos;email&apos;: &apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32302&quot; title=&quot;for-each loop over BSONObj is slower than explicit BSONObjIterator in MatchExpressionParser code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32302&quot;&gt;&lt;del&gt;SERVER-32302&lt;/del&gt;&lt;/a&gt; Introduce BSONObjStlIterator as a proper stl-style iterator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1497899f237dd60ad7313913c38c3f07fe168f2b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1497899f237dd60ad7313913c38c3f07fe168f2b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1753076" author="ian@10gen.com" created="Fri, 15 Dec 2017 15:53:10 +0000"  >&lt;p&gt;Passing to Platforms to investigate the core cause of why the foreach loop is slower.&lt;/p&gt;</comment>
                    </comments>
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