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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-19445] Performance regression in Mongo-Perf mms tests with wiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-19445</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running mongo-perf test Update.MmsIncShallow1 and the other mms tests shows a large regression (~90%) from master to 3.0.4. On evergreen, 3.1.5 gets 1100 ops/s and 3.0.4 gets 11,434. &lt;/p&gt;

&lt;p&gt;The following data captures both runs. The first run (A to B) is with 3.0.4. The second run (C to D) is with 3.1.5. &lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/82153/82153_screenshot.png&quot; width=&quot;800&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;br/&gt;
In particular, there appears to be a lot of eviction traffic in the second case, but not the first. The test is 5 seconds long and the server was started immediately before the test. &lt;/p&gt;


</description>
                <environment></environment>
        <key id="217223">SERVER-19445</key>
            <summary>Performance regression in Mongo-Perf mms tests with wiredTiger</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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="david.daly@mongodb.com">David Daly</reporter>
                        <labels>
                            <label>mpreg</label>
                    </labels>
                <created>Thu, 16 Jul 2015 17:26:47 +0000</created>
                <updated>Fri, 5 Feb 2016 14:29:23 +0000</updated>
                            <resolved>Mon, 20 Jul 2015 21:14:15 +0000</resolved>
                                    <version>3.1.5</version>
                                    <fixVersion>3.1.6</fixVersion>
                                    <component>Performance</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="968533" author="michael.cahill" created="Fri, 17 Jul 2015 03:29:46 +0000"  >&lt;p&gt;For posterity, what was going on in this workload was single-threaded updates to a single document.  The document was moderately large, so if WiredTiger accumulated enough versions of the document, it would hit the 10MB limit on the size of a page in memory and forcibly evict the page.&lt;/p&gt;

&lt;p&gt;There was a change in the drop for 3.1.5 that made WiredTiger lazier about updating the oldest transaction ID in the system.  This value determines how many version of the document we think need to stay in cache.  We used to update that value actively every time a transaction started, but some workloads go faster if regular operations don&apos;t update that shared state.&lt;/p&gt;

&lt;p&gt;The unfortunate consequence of that change was to trigger eviction in this workload &amp;#8211; the oldest ID was lagging far enough behind that we kept around enough versions of the document to reach the 10MB limit.  The solution committed into WiredTiger develop is to bump that oldest transaction ID when a transaction commits, if it thought it was the oldest one running.  This isn&apos;t exact, but particularly for single-threaded workloads it should have the effect of having the oldest ID track the current ID much more closely, which means we throw old versions of the document away much more quickly and never cause unnecessary eviction.&lt;/p&gt;</comment>
                            <comment id="968529" author="xgen-internal-githook" created="Fri, 17 Jul 2015 03:15:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;michaelcahill&apos;, u&apos;name&apos;: u&apos;Michael Cahill&apos;, u&apos;email&apos;: u&apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19445&quot; title=&quot;Performance regression in Mongo-Perf mms tests with wiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19445&quot;&gt;&lt;del&gt;SERVER-19445&lt;/del&gt;&lt;/a&gt; Have the oldest transaction update the oldest tracked ID.&lt;/p&gt;

&lt;p&gt;This will help keep the oldest tracked transation ID from falling too far&lt;br/&gt;
behind, particularly in single-threaded workloads.  That means we can keep&lt;br/&gt;
trimming obsolete updates, preventing pages from growing too large.&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/d5bddf2b3f3e2acb0b4d5f161de0b522d01fa12e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/d5bddf2b3f3e2acb0b4d5f161de0b522d01fa12e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="968471" author="david.daly" created="Fri, 17 Jul 2015 00:33:24 +0000"  >&lt;p&gt;I should add that this is a single threaded test workload, updating one document, so I wouldn&apos;t expect a need for a lot of sessions or concurrency. &lt;/p&gt;</comment>
                            <comment id="968469" author="david.daly" created="Fri, 17 Jul 2015 00:31:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=chung-yen.chang&quot; class=&quot;user-hover&quot; rel=&quot;chung-yen.chang&quot;&gt;chung-yen.chang&lt;/a&gt; It&apos;s a pretty dramatic change on that commit (order of magnitude). On my box it went from ~10.5k ops/sec to ~900 ops/s. Every commit I tested was either &amp;gt; 10k or &amp;lt; 1k. &lt;/p&gt;</comment>
                            <comment id="968461" author="alexander.gorrod" created="Fri, 17 Jul 2015 00:22:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael.cahill&quot; class=&quot;user-hover&quot; rel=&quot;michael.cahill&quot;&gt;michael.cahill&lt;/a&gt; I&apos;ll assign this one to you for now. The commit was a merge with WiredTiger which contains a lot of changes. The graph is interesting - one of the oddest things is that the open session count has dropped from 70 down to near 0. Maybe we are succeeding in forced eviction now, when we were doing in-memory splits before.&lt;/p&gt;

&lt;p&gt;Assign it back to me if I should investigate further.&lt;/p&gt;</comment>
                            <comment id="968455" author="chung-yen.chang" created="Fri, 17 Jul 2015 00:12:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.daly&quot; class=&quot;user-hover&quot; rel=&quot;david.daly&quot;&gt;david.daly&lt;/a&gt;, how much of the original drop can be attributed to git c8310411? Is that pretty much it or there are other contributors that need to be sorted through?&lt;/p&gt;</comment>
                            <comment id="968451" author="david.daly" created="Fri, 17 Jul 2015 00:05:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=agorrod&quot; class=&quot;user-hover&quot; rel=&quot;agorrod&quot;&gt;agorrod&lt;/a&gt; Assigning to you for now since you are on the commit. Please let me know if that is okay. &lt;/p&gt;</comment>
                            <comment id="968448" author="david.daly" created="Fri, 17 Jul 2015 00:02:47 +0000"  >&lt;p&gt;Bisect done:&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;c8310411be00fc1046fcd2472bbb55a5e82cf84e is the first bad commit&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;commit c8310411be00fc1046fcd2472bbb55a5e82cf84e&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;Author: Alexander Gorrod &amp;lt;alexander.gorrod@mongodb.com&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;Date:   Tue Jun 9 18:47:35 2015 +0000&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;    Import wiredtiger-wiredtiger-2.6.1-59-g1d2fe8a.tar.gz from wiredtiger branch mongodb-3.2&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;:040000 040000 73f116d665a56e98bb3a74871fffdf616f815823 e2d713f60138e05b75a78250e7d8933131db6691 M      src&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="968031" author="david.daly" created="Thu, 16 Jul 2015 17:31:29 +0000"  >&lt;p&gt;I will go ahead and do a bisect on this to see if it can be narrowed down to a commit. &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="212396">WT-1973</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="223984">SERVER-19744</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="227630">SERVER-20193</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="227636">SERVER-20195</issuekey>
        </issuelink>
                            </outwardlinks>
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                            <attachment id="82153" name="screenshot.png" size="255180" author="david.daly@mongodb.com" created="Thu, 16 Jul 2015 17:26:47 +0000"/>
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&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;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;        base.h[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;        for (var j = 0; j &amp;lt; 60; j++) {&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;            base.h[i][j] = { n: 0, t: 0, v: 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;    }&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(base);&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;setupMMS(db.Update_MmsIncShallow10)&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;query&quot;:{&quot;_id&quot;:0},&quot;update&quot;:{&quot;$inc&quot;:{&quot;a&quot;:1}},&quot;ns&quot;:&quot;test0.Update_MmsIncShallow10&quot;,&quot;safe&quot;:false,&quot;w&quot;:0,&quot;j&quot;:false,&quot;writeCmd&quot;:true}],&quot;seconds&quot;:10,&quot;host&quot;:&quot;127.0.0.1:27017&quot;,&quot;parallel&quot;:1})&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;The update line in the output shows the update throughput. &lt;/p&gt;</customfieldvalue>

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                        <customfieldname>Time In Status</customfieldname>
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_22870" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Triagers</customfieldname>
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                            <customfieldvalue>1|hsbxkf:</customfieldvalue>

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