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<channel>
    <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-20623] 10% Performance Regression in update path between 3.1.2 and master (Update.IncFewDocs, Update.IncNoIndex, Update.IncWithIndex, MultiUpdate.Uncontended.TwoDocs.NoIndex...)</title>
                <link>https://jira.mongodb.org/browse/SERVER-20623</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongo-perf shows a large regression on all of the update tests sometime between 3.1.2 and 3.1.4 on wiredTiger, probably over multiple commits, and another ~4% drop since 3.1.4. On WiredTiger and MMAPv1, although the regression shows earlier on wiredTiger. &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_standalone_update_c48ff0ba613fdafd51d26f664371522837809a9d_15_10_23_04_39_37##%7B%22perftab%22:1,%22compare%22:%5B%7B%22tag%22:%7B%22tag%22:%223.0.6-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.2-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.3-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.4-Baseline%22%7D%7D%5D%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WiredTiger Results&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_mmap_standalone_update_c48ff0ba613fdafd51d26f664371522837809a9d_15_10_23_04_39_37##%7B%22perftab%22:1,%22compare%22:%5B%7B%22tag%22:%7B%22tag%22:%223.0.6-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.2-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.4-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.5-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.6-Baseline%22%7D%7D%5D%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MMAPv1 Results&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Two simplified shell based reproductions. &lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Update.MultiUpdate.Uncontended.TwoDocs.NoIndex&quot;&gt;&lt;/a&gt;Update.MultiUpdate.Uncontended.TwoDocs.NoIndex&lt;/h4&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;var setupTestUncontendedTwoDocs = function( collection ) {&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;    collection.drop();&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;    var docs = [];&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;    for ( var i = 0; i &amp;lt; 4800; i++ ) {&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;        docs.push( { _id : i , x : 0 } );&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;    }&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;    collection.insert(docs);&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;    collection.getDB().getLastError();&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;};&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;use test0&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;setupTestUncontendedTwoDocs(db.MultiUpdate_Uncontended_TwoDocs_NoIndex0)&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;benchRun({&quot;ops&quot;:[{&quot;op&quot;:&quot;update&quot;,&quot;multi&quot;:true,&quot;query&quot;:{&quot;_id&quot;:{&quot;$in&quot;:[{&quot;#RAND_INT_PLUS_THREAD&quot;:[0,100]},{&quot;#RAND_INT_PLUS_THREAD&quot;:[0,100]}]}},&quot;update&quot;:{&quot;$inc&quot;:{&quot;x&quot;:1}},&quot;ns&quot;:&quot;test0.MultiUpdate_Uncontended_TwoDocs_NoIndex0&quot;,&quot;safe&quot;:false,&quot;w&quot;:0,&quot;j&quot;:false,&quot;writeCmd&quot;:true}],&quot;seconds&quot;:5,&quot;host&quot;:&quot;127.0.0.1:27017&quot;,&quot;parallel&quot;:8})&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;h4&gt;&lt;a name=&quot;Update.FieldAtOffset&quot;&gt;&lt;/a&gt;Update.FieldAtOffset&lt;/h4&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;var setup = function( collection ) {&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;                  collection.drop();&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;&amp;nbsp;&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;                  var kFieldCount = 512;&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;&amp;nbsp;&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;                  // Build the document and insert several copies.&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;                  var toInsert = {};&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;                  for (var i = 0; i &amp;lt; kFieldCount; i++) {&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;                      toInsert[&quot;a_&quot; + i.toString()] = &quot;a&quot;;&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;                  }&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;                  &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;                  var docs = [];&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;                  for (var i = 0; i &amp;lt; 100; i++) {&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;                      docs.push(toInsert);&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;                  }&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;                  collection.insert(docs);&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;                  collection.getDB().getLastError();&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;              }&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;use test0&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;setup(db.Update_FieldAtOffset0)&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;benchRun({&quot;ops&quot;:[{&quot;op&quot;:&quot;update&quot;,&quot;multi&quot;:true,&quot;query&quot;:{},&quot;update&quot;:{&quot;$set&quot;:{&quot;a_256&quot;:&quot;a&quot;}},&quot;ns&quot;:&quot;test0.Update_FieldAtOffset0&quot;,&quot;safe&quot;:false,&quot;w&quot;:0,&quot;j&quot;:false,&quot;writeCmd&quot;:true},{&quot;op&quot;:&quot;update&quot;,&quot;multi&quot;:true,&quot;query&quot;:{},&quot;update&quot;:{&quot;$set&quot;:{&quot;a_256&quot;:&quot;aa&quot;}},&quot;ns&quot;:&quot;test0.Update_FieldAtOffset0&quot;,&quot;safe&quot;:false,&quot;w&quot;:0,&quot;j&quot;:false,&quot;writeCmd&quot;:true}],&quot;seconds&quot;:5,&quot;host&quot;:&quot;127.0.0.1:27017&quot;,&quot;parallel&quot;:8})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="229308">SERVER-20623</key>
            <summary>10% Performance Regression in update path between 3.1.2 and master (Update.IncFewDocs, Update.IncNoIndex, Update.IncWithIndex, MultiUpdate.Uncontended.TwoDocs.NoIndex...)</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="4">Incomplete</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="david.daly@mongodb.com">David Daly</reporter>
                        <labels>
                            <label>mpreg</label>
                    </labels>
                <created>Fri, 11 Sep 2015 13:47:35 +0000</created>
                <updated>Tue, 6 Dec 2022 04:43:35 +0000</updated>
                            <resolved>Thu, 17 Nov 2016 16:18:35 +0000</resolved>
                                                                    <component>Performance</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1436620" author="milkie" created="Thu, 17 Nov 2016 16:18:35 +0000"  >&lt;p&gt;While it would be desirable to understand what exactly caused this particular slowdown, I don&apos;t think it&apos;s a reasonable use of resources to spend on it.&lt;br/&gt;
Going forward, we will be more proactive about investigating perf regressions as they are detected.&lt;/p&gt;</comment>
                            <comment id="1112695" author="xgen-internal-githook" created="Fri, 11 Dec 2015 23:15:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dalyd&apos;, u&apos;name&apos;: u&apos;dalyd&apos;, u&apos;email&apos;: u&apos;david.daly@mongodb.com&apos;}
&lt;p&gt;Message: Overrides for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20623&quot; title=&quot;10% Performance Regression in update path between 3.1.2 and master (Update.IncFewDocs, Update.IncNoIndex, Update.IncWithIndex, MultiUpdate.Uncontended.TwoDocs.NoIndex...)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20623&quot;&gt;&lt;del&gt;SERVER-20623&lt;/del&gt;&lt;/a&gt; for linux-wt-repl&lt;br/&gt;
Branch: mc-test&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/dsi/commit/9f0382cd368bb6153bb089ab3016d3366ced41eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/dsi/commit/9f0382cd368bb6153bb089ab3016d3366ced41eb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1100827" author="david.daly" created="Mon, 30 Nov 2015 16:39:38 +0000"  >&lt;p&gt;With recent commits between rc3 and rc4, this regression is less than 5% in general for standalone&lt;br/&gt;
Current &lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_mmap_standalone_update_e7181b542b25981db42f74cdaee4e7fc323d3e9d_15_11_30_04_06_21##%7B%22perftab%22:1,%22compare%22:%5B%7B%22tag%22:%7B%22tag%22:%223.0.7-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.2-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.2.0-rc3-Baseline%22%7D%7D%5D%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MMAP results&lt;/a&gt;&lt;br/&gt;
and current &lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_standalone_update_e7181b542b25981db42f74cdaee4e7fc323d3e9d_15_11_30_04_06_21##%7B%22perftab%22:1,%22compare%22:%5B%7B%22tag%22:%7B%22tag%22:%223.2.0-rc4-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.2.0-rc3-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.0.7-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.2-Baseline%22%7D%7D%5D%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WT results&lt;/a&gt;&lt;br/&gt;
Ignore the doc validation data in there, as we use a different comparison point for them. &lt;/p&gt;

&lt;p&gt;However the WT with replication still shows a drop from 3.1.2, that occurred between 3.1.2 and 3.1.4. Results &lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_repl_update_909b13f0ac6ed6d0de5a37ae3b833494f9a12218_15_11_30_15_39_02##%7B%22perftab%22:1,%22compare%22:%5B%7B%22tag%22:%7B%22tag%22:%223.0.6-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.2-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.3-Baseline%22%7D%7D,%7B%22tag%22:%7B%22tag%22:%223.1.4-Baseline%22%7D%7D%5D%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1097222" author="david.daly" created="Tue, 24 Nov 2015 16:12:03 +0000"  >&lt;p&gt;Also MultiUpdate.Uncontended.TwoDocs.NoIndex shows on 1Node MMAP in similar pattern. &lt;/p&gt;</comment>
                            <comment id="1070722" author="xgen-internal-githook" created="Mon, 26 Oct 2015 18:50:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;ksuarz@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20623&quot; title=&quot;10% Performance Regression in update path between 3.1.2 and master (Update.IncFewDocs, Update.IncNoIndex, Update.IncWithIndex, MultiUpdate.Uncontended.TwoDocs.NoIndex...)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20623&quot;&gt;&lt;del&gt;SERVER-20623&lt;/del&gt;&lt;/a&gt; overrides for update tests&lt;/p&gt;

&lt;p&gt;This overrides the performance regression in the update tests for WT standalone&lt;br/&gt;
and MMAP standalone.&lt;/p&gt;

&lt;p&gt;Signed-off-by: David Daly &amp;lt;david.daly@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b80acee146f87d81648212fa92fb9c440bcf429f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b80acee146f87d81648212fa92fb9c440bcf429f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1060492" author="chung-yen.chang" created="Wed, 14 Oct 2015 16:34:56 +0000"  >&lt;p&gt;Just checked the latest data against 3.1.2 and we are still regressed.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_mmap_standalone_update_694e8d341e35091f168ed65665f54fb99f4c3f25_15_10_14_03_44_14##%7B%22compare%22:%5B%7B%22tag%22:%7B%22tag%22:%223.1.2-Baseline%22%7D%7D%5D,%22perftab%22:1%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mmapv1&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_standalone_update_694e8d341e35091f168ed65665f54fb99f4c3f25_15_10_14_03_44_14##%7B%22compare%22:%5B%7B%22tag%22:%7B%22tag%22:%223.1.2-Baseline%22%7D%7D%5D,%22perftab%22:1%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wiredTiger&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The worst regressions are for doc validation updates. For both storage engines, we saw close to 20% of regressions for the updates with doc validation. The other cases are seeing roughly 10% for wiredTiger and ~5% for mmapv1. &lt;/p&gt;</comment>
                            <comment id="1033173" author="chung-yen.chang" created="Thu, 17 Sep 2015 16:05:32 +0000"  >&lt;p&gt;This is a regression that happened quite a while back. Moving it into the CAP project for proper investigation.&lt;/p&gt;</comment>
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