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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-58064] Investigate the increase in database validation time between MongoDB versions </title>
                <link>https://jira.mongodb.org/browse/SERVER-58064</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While running the workloads for the Benchmark Long Lived Transaction project, it was noted that the validation commands take longer in new database versions.&lt;/p&gt;

&lt;p&gt;In general, workloads with more write operations took longer to validate (the % change in the  total amount of time ranged from about 10 to 35%).&lt;/p&gt;

&lt;p&gt;Is this increase expected? Is there anything that can be done to bring the validation times of the later versions down to match the earlier version.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1796700">SERVER-58064</key>
            <summary>Investigate the increase in database validation time between MongoDB versions </summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="jim.oleary@mongodb.com">James O&apos;Leary</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Jun 2021 16:09:42 +0000</created>
                <updated>Thu, 18 Nov 2021 15:52:54 +0000</updated>
                            <resolved>Thu, 18 Nov 2021 15:52:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4195497" author="gregory.noma" created="Wed, 17 Nov 2021 16:43:50 +0000"  >&lt;p&gt;I realize that my analysis in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58064?focusedCommentId=4184010&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-4184010&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;my previous comment&lt;/a&gt; may not be entirely correct, since in 4.2 we also need to account for the time spent in &lt;tt&gt;KeyString::resetToKey&lt;/tt&gt; as we still need to convert to &lt;tt&gt;KeyString&lt;/tt&gt; even after generating the key in BSON. However, generating the key in BSON and then converting to &lt;tt&gt;KeyString&lt;/tt&gt; may still be faster than building the key in &lt;tt&gt;KeyString&lt;/tt&gt; to begin with.&lt;/p&gt;

&lt;p&gt;I should also note that I ran some tests with more indexes on the same dataset, the exact configuration of which caused the results to quite different. In some cases 4.2 and 4.4 performed very close to one another, and in some cases 4.4 was actually faster than 4.2. This makes sense since the more indexes there are, the more keys with have to additionally convert from BSON to &lt;tt&gt;KeyString&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Unfortunately the refactor in PM-822 makes it a bit difficult to directly compare the perf results side-by-side. My best guess at the moment is that depending on the exact dataset and indexes, key generation is slower. There may also be some very small regressions in various places due to the refactor, but those are a bit harder to tell. I think we would need to test on a wider variety of datasets to know for sure that there is a general regression, versus just with certain types of data (potentially with speedups on different datasets). Assuming key generation &lt;b&gt;is&lt;/b&gt; the bottleneck here, I don&apos;t think there&apos;s really anything we can easily do about it. We would probably instead have to look to make optimizations in other areas.&lt;/p&gt;

&lt;p&gt;In conclusion, there doesn&apos;t appear to be anything immediately obvious here to improve on. If we think it&apos;s important enough to do so, I think we can open a separate ticket to look into making small improvements to various parts of the validate logic. It would also be useful to have more performance workloads for validate with a wider variety of datasets and index types.&lt;/p&gt;</comment>
                            <comment id="4191615" author="jim.oleary@10gen.com" created="Tue, 16 Nov 2021 13:50:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gregory.noma&quot; class=&quot;user-hover&quot; rel=&quot;gregory.noma&quot;&gt;gregory.noma&lt;/a&gt; There are &lt;a href=&quot;https://github.com/mongodb/genny/blob/d4897cf792d3ea30c40c94c5e04ce715a918cd1f/src/workloads/transactions/LLTMixed.yml#L28-L31&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;3 other indexes&lt;/a&gt; per collection (there are 4 collections).&lt;/p&gt;</comment>
                            <comment id="4191561" author="gregory.noma" created="Tue, 16 Nov 2021 13:29:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jim.oleary&quot; class=&quot;user-hover&quot; rel=&quot;jim.oleary&quot;&gt;jim.oleary&lt;/a&gt;&#160;were there any secondary indexes on the collections from your validate numbers, or only the &lt;tt&gt;&amp;#95;id&lt;/tt&gt; index?&lt;/p&gt;</comment>
                            <comment id="4184010" author="gregory.noma" created="Thu, 11 Nov 2021 20:04:19 +0000"  >&lt;p&gt;I ran another test, this time with a slightly larger dataset (10 million documents rather than 1 million), and this time the main difference seems to be from &lt;tt&gt;BtreeKeyGenerator::getKeys&lt;/tt&gt;.&lt;br/&gt;
4.2:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;4.4:&lt;/p&gt;
&lt;p/&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;                  - 19.80% mongo::BtreeKeyGenerator::getKeys                                                                                                                      &#9618;&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;                     + 6.29% mongo::KeyString::BuilderBase&amp;lt;mongo::StackBufBuilderBase&amp;lt;512ul&amp;gt; &amp;gt;::appendBSONElement                                                                 &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                     + 2.96% mongo::KeyString::BuilderBase&amp;lt;mongo::StackBufBuilderBase&amp;lt;512ul&amp;gt; &amp;gt;::appendRecordId                                                                    &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                     + 2.54% mongo::BSONObj::getField                                                                                                                             &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                     + 2.49% std::_Rb_tree&amp;lt;mongo::KeyString::Value, mongo::KeyString::Value, std::_Identity&amp;lt;mongo::KeyString::Value&amp;gt;, std::less&amp;lt;mongo::KeyString::Value&amp;gt;, std::all&#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                     + 1.52% std::vector&amp;lt;std::set&amp;lt;unsigned long, std::less&amp;lt;unsigned long&amp;gt;, std::allocator&amp;lt;unsigned long&amp;gt; &amp;gt;, std::allocator&amp;lt;std::set&amp;lt;unsigned long, std::less&amp;lt;unsig&#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                     + 1.19% mongo::mongoMalloc                                                                                                                                   &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;            + 5.23% mongo::validateBSON                                                                                                                                           &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;            + 3.17% mongo::IndexConsistency::addDocKey                                                                                                                            &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;              1.08% std::map&amp;lt;std::__cxx11::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt;, mongo::IndexInfo, std::less&amp;lt;std::__cxx11::basic_string&amp;lt;char, std::ch&#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;              1.05% std::_Rb_tree&amp;lt;mongo::KeyString::Value, mongo::KeyString::Value, std::_Identity&amp;lt;mongo::KeyString::Value&amp;gt;, std::less&amp;lt;mongo::KeyString::Value&amp;gt;, std::allocator&amp;lt;mo&#9618;&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;              0.73% mongo::IndexDescriptor::isMultikey                                                                                                                            &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;         + 17.67% mongo::SeekableRecordThrottleCursor::next                                                                                                                       &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;           1.08% mongo::ProgressMeter::hit                                                                                                                                        &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&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;      + 34.94% mongo::ValidateAdaptor::traverseIndex                                                                                                                              &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This possibly points to PM-1345, which changed index key generation to use &lt;tt&gt;KeyString&lt;/tt&gt; rather than BSON. This seems like a reasonable explanation, since key generation using &lt;tt&gt;KeyString&lt;/tt&gt; is expected to be slower.&lt;/p&gt;</comment>
                            <comment id="4178595" author="gregory.noma" created="Tue, 9 Nov 2021 19:29:15 +0000"  >&lt;p&gt;I ran a relatively small test, running validate on a collection containing 1 million documents with only an integer &lt;tt&gt;_id&lt;/tt&gt; field. Going from 4.2 to 4.4, I saw a 16.4% speed reduction. A cursory look a the perf profiling seems to show that the main difference is in &lt;tt&gt;WiredTigerRecordStoreCursorBase::next&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;4.2:&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-   93.01%     0.36%  conn1            mongod              [.] mongo::CollectionImpl::validate                                                                                   &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   - 92.65% mongo::CollectionImpl::validate                                                                                                                                      &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;      + 41.62% mongo::RecordStoreValidateAdaptor::validate                                                                                                                       &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;      + 38.49% mongo::RecordStoreValidateAdaptor::traverseIndex                                                                                                                  &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;      - 12.41% mongo::WiredTigerRecordStoreCursorBase::next                                                                                                                      &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;         - 5.16% __curfile_next                                                                                                                                                  &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;            - 3.75% __wt_btcur_next                                                                                                                                              &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;                 __cursor_row_slot_return                                                                                                                                        &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;         + 3.20% mongo::WiredTigerRecordStoreStandardCursor::hasWrongPrefix                                                                                                      &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;         + 1.11% __wt_cursor_get_value                                                                                                                                           &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;           0.94% mongo::PrepareConflictTracker::endPrepareConflict                                                                                                               &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;4.4:&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&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-top: 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;-   92.51%     0.00%  conn2            mongod              [.] mongo::CollectionValidation::validate                                                                              &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   - mongo::CollectionValidation::validate                                                                                                                                        &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;      - 57.17% mongo::ValidateAdaptor::traverseRecordStore                                                                                                                        &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;         + 36.31% mongo::ValidateAdaptor::validateRecord                                                                                                                          &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;         - 19.20% mongo::SeekableRecordThrottleCursor::next                                                                                                                       &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;            - 17.64% mongo::WiredTigerRecordStoreCursorBase::next                                                                                                                 &#9618;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;               - 10.02% __curfile_next                                                                                                                                            &#9618;&lt;/span&gt;&lt;/pre&gt;
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			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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&lt;p/&gt;</comment>
                            <comment id="3898315" author="jim.oleary@10gen.com" created="Thu, 24 Jun 2021 18:12:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=connie.chen&quot; class=&quot;user-hover&quot; rel=&quot;connie.chen&quot;&gt;connie.chen&lt;/a&gt;&lt;br/&gt;
 Nominally, the motivation was partly due to some of the genny tests failing because validation phase of the task was taking longer. These particular tests were not deployed in the end so this is not a huge issue.&lt;/p&gt;

&lt;p&gt;The LLT workloads run for a fixed amount of time,&#160; but the overall duration of the task was taking longer on the later versions.&#160; So I was interested to see if this increase in the validation times is something that was expected.&lt;/p&gt;

&lt;p&gt;The number above are the sum of the millisecond durations of the validate commands scraped from the mongod logs.&lt;/p&gt;

&lt;p&gt;So for example, in the following case:&lt;br/&gt;
 &#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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-top: 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;llt_insert_high_ltc linux-3-node-replSet&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;    756437 v4.2 total&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;   1016256 v4.4 total       0.34&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;   1030633 v5.0 total       0.36&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;On a V4.2 3 node replset, validating 4 collections (with 20M docs each) and a DB size of ~ 12GB took 756437 milliseconds.&lt;br/&gt;
 On a V4.4 3 node replset, validating 4 collections (with 20M docs each) and a DB size of ~ 12GB took 1016256 milliseconds.&lt;br/&gt;
 On a V5.0&#160;3 node replset (albeit an older git revision), validating 4 collections (with 20M docs each) and a DB size of ~ 12GB took 1030633 milliseconds.&lt;br/&gt;
 V4.4 and V5.0 are 34% and 36% slower respectively.&lt;/p&gt;</comment>
                            <comment id="3898251" author="connie.chen" created="Thu, 24 Jun 2021 17:52:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jim.oleary&quot; class=&quot;user-hover&quot; rel=&quot;jim.oleary&quot;&gt;jim.oleary&lt;/a&gt;&#160;- could you provide additional context behind the motivation for this?&#160;&lt;br/&gt;
Please also detail what the numbers mean in the chart you provided in the comment above.&#160;&lt;/p&gt;</comment>
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