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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-32700] Performance regression with latest release (r3.6.2) compared to (r3.4.9)</title>
                <link>https://jira.mongodb.org/browse/SERVER-32700</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I use &lt;a href=&quot;https://github.com/brianfrankcooper/YCSB&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;YCSB&lt;/a&gt; benchmark to evaluate MongoDB performance on localhost machine and I am seeing performance regression with latest releases (r3.6.x) compared to r3.4.9.&lt;/p&gt;

&lt;p&gt;For &lt;a href=&quot;https://github.com/brianfrankcooper/YCSB/wiki/Core-Workloads&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;YCSB-Core-Workloads&lt;/a&gt; I am seeing ~5% drop in performance on Broadwell and Centriq platforms.&lt;/p&gt;

&lt;p&gt;I wanted to know if this is a known performance issue and are there any investigations pending to improve performance with latest release (r3.6.2)&lt;/p&gt;</description>
                <environment></environment>
        <key id="482994">SERVER-32700</key>
            <summary>Performance regression with latest release (r3.6.2) compared to (r3.4.9)</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="backlog-server-triage">Backlog - Triage Team</assignee>
                                    <reporter username="Arkeri">Praveen Arkeri</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Jan 2018 05:25:25 +0000</created>
                <updated>Tue, 6 Dec 2022 03:41:38 +0000</updated>
                            <resolved>Thu, 24 Jun 2021 16:50:22 +0000</resolved>
                                    <version>3.6.2</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1799184" author="arkeri" created="Thu, 8 Feb 2018 08:25:54 +0000"  >&lt;p&gt;@Kelsey,&lt;/p&gt;

&lt;p&gt;Thanks for your reply, will follow tickets listed above to get updates on performance improvements.&lt;/p&gt;

&lt;p&gt;-Praveen&lt;/p&gt;</comment>
                            <comment id="1798948" author="thomas.schubert" created="Thu, 8 Feb 2018 00:52:30 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Arkeri&quot; class=&quot;user-hover&quot; rel=&quot;Arkeri&quot;&gt;Arkeri&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Sorry for the delay getting back to you. We&apos;re actively working on a number of performance improvements that we expect to arrive in 3.6 soon. Given these known issues, we&apos;d like to focus on getting these improvements into 3.6 where we can test their impact on the workload you describe and determine whether this issue has been resolved.&lt;/p&gt;

&lt;p&gt;Please feel free to review or watch these tickets which track some of the work that is being done to improve performance:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-3816&quot; title=&quot;Enable prefix compression on the lookaside table&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3816&quot;&gt;&lt;del&gt;WT-3816&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/WT-3768&quot; title=&quot;Lookaside optimization: birthmarks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3768&quot;&gt;&lt;del&gt;WT-3768&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/WT-3767&quot; title=&quot;Avoid lookaside instantiation for faster reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3767&quot;&gt;&lt;del&gt;WT-3767&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/WT-3854&quot; title=&quot;Remove write lock from commit path, leaving old entries in queue&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3854&quot;&gt;&lt;del&gt;WT-3854&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/WT-3805&quot; title=&quot;Avoid reading lookaside pages in truncate fast path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3805&quot;&gt;&lt;del&gt;WT-3805&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/WT-3766&quot; title=&quot;Lookaside sweep for obsolete updates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3766&quot;&gt;&lt;del&gt;WT-3766&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Some of these tickets have already been backported and will be available in the next release, MongoDB 3.6.3.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1794790" author="arkeri" created="Mon, 5 Feb 2018 04:41:15 +0000"  >&lt;p&gt;Do we have any update on investigation related to performance regression with latest release (r3.6.2)?&lt;/p&gt;

&lt;p&gt;Also using below test from &lt;a href=&quot;https://github.com/mongodb/mongo-perf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongo-perf&lt;/a&gt; I see similar performance degradation on Broadwell and Centriq platforms for various threads.&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;   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;python benchrun.py -f testcases/simple_insert.js -t 1 2 4 8 16 24 32 48 64 96 128 -s /path/to/mongodb-r3.6.2/bin/mongo&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1780413" author="arkeri" created="Mon, 22 Jan 2018 09:42:14 +0000"  >&lt;p&gt;Benchmark config used:&lt;br/&gt;
Starting Server:&lt;/p&gt;

&lt;p&gt;mount -t tmpfs -o rw,size=20000m tmpfs /mnt&lt;br/&gt;
mkdir /mnt/data&lt;br/&gt;
$MONGO_HOME/bin/mongod --dbpath=/mnt/data/&lt;/p&gt;

&lt;p&gt;YCSB run commands:&lt;br/&gt;
$YCSB_HOME/bin/ycsb load mongodb -P workloads/workloada -p recordcount=5000000 -threads 96 -s;&lt;br/&gt;
$YCSB_HOME/bin/ycsb run mongodb -P workloads/workloada -p operationcount=5000000 -threads 96 -s;&lt;/p&gt;</comment>
                            <comment id="1780412" author="arkeri" created="Mon, 22 Jan 2018 09:39:23 +0000"  >&lt;p&gt;I have uploaded diagnostic.data with an archive named &apos;centriq2400_broadwell2699_ycsb_mongodb_diagnostic_data.zip&apos;, let me know if you can access.&lt;/p&gt;</comment>
                            <comment id="1778049" author="mark.agarunov" created="Thu, 18 Jan 2018 18:13:36 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Arkeri&quot; class=&quot;user-hover&quot; rel=&quot;Arkeri&quot;&gt;Arkeri&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the response. The &lt;tt&gt;diagnostic.data&lt;/tt&gt; directory does not contain any user data. It periodically collects the output of the following commands, which you are welcome to execute yourself to examine the output.&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;serverStatus: db.serverStatus({tcmalloc: &lt;/span&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;true&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;})&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;replSetGetStatus: rs.status()&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;collStats &lt;/span&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; local.oplog.rs: db.getSiblingDB(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;local&apos;&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;).oplog.rs.stats()&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;getCmdLineOpts: db.adminCommand({getCmdLineOpts: &lt;/span&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;true&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;})&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;buildInfo: db.adminCommand({buildInfo: &lt;/span&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;true&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;})&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;hostInfo: db.adminCommand({hostInfo: &lt;/span&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;true&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;})&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;However, since you have expressed some concern, I&apos;ve gone ahead and created a &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/2e4ad712-748b-434c-907b-c17dd30bc376.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;secure upload portal for you to use.&lt;/a&gt;. Files uploaded to this portal are only visible to MongoDB employees and are routinely deleted after some time.&lt;/p&gt;

&lt;p&gt;To use this data we have internal tools to visualize and interpret the data. &lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1777906" author="arkeri" created="Thu, 18 Jan 2018 16:39:49 +0000"  >&lt;p&gt;Hi MarkA&lt;/p&gt;

&lt;p&gt;Few questions on diagnostic.data:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;For me it looks like data is in binary format, what kind of data is stored in this?&lt;/li&gt;
	&lt;li&gt;Which tool do you use to extract required information?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks&lt;br/&gt;
Praveen&lt;/p&gt;</comment>
                            <comment id="1775631" author="mark.agarunov" created="Tue, 16 Jan 2018 20:41:51 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Arkeri&quot; class=&quot;user-hover&quot; rel=&quot;Arkeri&quot;&gt;Arkeri&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. To get some more insight into this issue, could you please provide the following:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Please archive (tar or zip) the &lt;tt&gt;$dbPath/diagnostic.data&lt;/tt&gt; directory&lt;/li&gt;
	&lt;li&gt;The exact configuration you are using for ycsb and the command it is being run with.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This should provide some information to help diagnose this.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1774106" author="arkeri" created="Mon, 15 Jan 2018 06:07:01 +0000"  >&lt;p&gt;Also I see there is ~35% increase in binary size from ~650MB (r3.4.9) to ~950MB (r3.6.2) for both x86_64 and aarch64 when compiled with GCC-6.3&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;Followed YCSB benchmark user guide available here --&amp;gt; &lt;a href=&quot;https://github.com/brianfrankcooper/YCSB/wiki/Running-a-Workload&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Running-YCSB&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Benchmark Configuration:&lt;/b&gt;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Client and server run on same machine&lt;/li&gt;
	&lt;li&gt;Server configured to use tmpfs (inRAM) for all data storage (avoiding disk usage)&lt;/li&gt;
	&lt;li&gt;Client thread count = 96&lt;/li&gt;
	&lt;li&gt;Record Count = 5000000&lt;/li&gt;
&lt;/ul&gt;
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