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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-19975] 30% performance regression on simple insert workload on primary</title>
                <link>https://jira.mongodb.org/browse/SERVER-19975</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Saw a 30% performance decline between 3.1.4 and 3.1.5 in a simple insert workload - 8 threads of the following:&lt;/p&gt;

&lt;p/&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;    for (var i=0; i&amp;lt;500000; ) {&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;        var bulk = db.c.initializeUnorderedBulkOp();&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;        for (var j=0; j&amp;lt;every; j++, i++)&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;   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;            bulk.insert({x:0})&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;   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;        bulk.execute()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Execution time in seconds:&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;tr id=&quot;syntaxplugin_code_and_gutter&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;        1-node rs    standalone     1-node rs&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;3.0.5     19            11             90&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;3.1.4     20            12             91&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;   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;3.1.5     28            12            109&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;No performance regression on standalone node, and regression is the primary, so presumably related to oplog insertion. Similar performance regression for both WT and mmapv1.&lt;/p&gt;

&lt;p&gt;Did a git bisect and identified &lt;a href=&quot;https://github.com/mongodb/mongo/commit/f302737346da1bfb46f5c3b295bfb7896daa1508&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;f302737346da1bfb46f5c3b295bfb7896daa1508&lt;/a&gt; as the first bad commit, and this change is indeed related to oplog processing.&lt;/p&gt;

&lt;p&gt;Even though this is a bit old at this point, more recent builds show similar (or worse) performance, so presumably this is still relevant.&lt;/p&gt;</description>
                <environment></environment>
        <key id="225848">SERVER-19975</key>
            <summary>30% performance regression on simple insert workload on primary</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="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Sat, 15 Aug 2015 22:55:01 +0000</created>
                <updated>Sat, 19 Sep 2015 00:10:20 +0000</updated>
                            <resolved>Fri, 21 Aug 2015 16:23:05 +0000</resolved>
                                    <version>3.1.5</version>
                    <version>3.1.6</version>
                                    <fixVersion>3.1.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1011852" author="scotthernandez" created="Fri, 21 Aug 2015 16:23:05 +0000"  >&lt;p&gt;Other commits may have contributed to restoring throughput other than the ones included here.&lt;/p&gt;</comment>
                            <comment id="1011850" author="xgen-internal-githook" created="Fri, 21 Aug 2015 16:20:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19975&quot; title=&quot;30% performance regression on simple insert workload on primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19975&quot;&gt;&lt;del&gt;SERVER-19975&lt;/del&gt;&lt;/a&gt;: use cached protocol version (atomic)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ad561b8a31f3b8233ac5f905e2b2a089c5b1302&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ad561b8a31f3b8233ac5f905e2b2a089c5b1302&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1009964" author="scotthernandez" created="Wed, 19 Aug 2015 19:32:00 +0000"  >&lt;p&gt;I believe this may be due to the additional checks on protocol version and have a patch to address this which will be included in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19950&quot; title=&quot;db.serverStatus({repl:1}) hangs indefinitely&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19950&quot;&gt;&lt;del&gt;SERVER-19950&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1007074" author="bruce.lucas@10gen.com" created="Mon, 17 Aug 2015 13:43:17 +0000"  >&lt;p&gt;Added timing above for 3.0.5 to clarify that this is a significant performance regression relative to 3.0.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="204545">SERVER-18498</issuekey>
        </issuelink>
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