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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-20193] Performance regression in Single-threaded MMS workloads from git: a7338c4</title>
                <link>https://jira.mongodb.org/browse/SERVER-20193</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Big performance drop (&amp;gt;80%) from git: a7338c4 on single-threaded MMS workloads. Same build was marked red for Geo and Misc cases but there only one test failed for single-threaded cases and the drop was much smaller. I think it&apos;s safe to ignore that and just focus on the MMS cases. &lt;/p&gt;

&lt;p&gt;The commit that caused this was a wiredTiger check-in. WT team is aware of this drop so I am putting WT as the component for this ticket so they can pick this ticket up.&lt;/p&gt;</description>
                <environment></environment>
        <key id="227630">SERVER-20193</key>
            <summary>Performance regression in Single-threaded MMS workloads from git: a7338c4</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="david.hows">David Hows</assignee>
                                    <reporter username="chung-yen.chang">Chung-yen Chang</reporter>
                        <labels>
                            <label>mpreg</label>
                    </labels>
                <created>Fri, 28 Aug 2015 22:47:24 +0000</created>
                <updated>Mon, 7 Dec 2015 02:00:49 +0000</updated>
                            <resolved>Fri, 11 Sep 2015 06:34:45 +0000</resolved>
                                                    <fixVersion>3.1.8</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1031479" author="xgen-internal-githook" created="Wed, 16 Sep 2015 11:54:21 +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: Merge pull request #2188 from wiredtiger/visible_all_call&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt; Fix obsolete transaction check&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/8be547b318f0195d0c3c13a692589631f381f935&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/8be547b318f0195d0c3c13a692589631f381f935&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1031478" author="xgen-internal-githook" created="Wed, 16 Sep 2015 11:54:19 +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-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt; Fix clearing of obsolete check transaction.&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/0b359e0a3661f859db8d5d86c255045582f5d556&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/0b359e0a3661f859db8d5d86c255045582f5d556&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1025859" author="xgen-internal-githook" created="Thu, 10 Sep 2015 00:00:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agorrod&apos;, u&apos;name&apos;: u&apos;Alex Gorrod&apos;, u&apos;email&apos;: u&apos;alexander.gorrod@mongodb.com&apos;}
&lt;p&gt;Message: Merge pull request #2177 from wiredtiger/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt; - Performance regression fix&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/b044603cf9c3032526ddc144fdf23ef9d862b617&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/b044603cf9c3032526ddc144fdf23ef9d862b617&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1025858" author="xgen-internal-githook" created="Thu, 10 Sep 2015 00:00:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;agorrod&apos;, u&apos;name&apos;: u&apos;Alex Gorrod&apos;, u&apos;email&apos;: u&apos;alexander.gorrod@mongodb.com&apos;}
&lt;p&gt;Message: Merge pull request #2177 from wiredtiger/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt; - Performance regression fix&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/b044603cf9c3032526ddc144fdf23ef9d862b617&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/b044603cf9c3032526ddc144fdf23ef9d862b617&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1025857" author="xgen-internal-githook" created="Thu, 10 Sep 2015 00:00:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;David Hows&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt; - Change when WT_TXN_NONE is set, update comments&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/a60a16cbf14f67c4b6a4c4452782f5faac1617cc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/a60a16cbf14f67c4b6a4c4452782f5faac1617cc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1025856" author="xgen-internal-githook" created="Thu, 10 Sep 2015 00:00:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;David Hows&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20193&quot; title=&quot;Performance regression in Single-threaded MMS workloads from git: a7338c4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20193&quot;&gt;&lt;del&gt;SERVER-20193&lt;/del&gt;&lt;/a&gt; - Performance regression fix&lt;br/&gt;
Branch: develop&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/commit/713daf2a75a6c602e9ffa23f74dfec2f0ddc9a8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/commit/713daf2a75a6c602e9ffa23f74dfec2f0ddc9a8a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1023308" author="michael.cahill" created="Mon, 7 Sep 2015 06:14:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.hows&quot; class=&quot;user-hover&quot; rel=&quot;david.hows&quot;&gt;david.hows&lt;/a&gt;, I&apos;m pretty sure my comment above explains what&apos;s going on here &amp;#8211; can you please re-run this and make sure you can see the slowdown?&lt;/p&gt;

&lt;p&gt;The fix is to call &lt;tt&gt;__wt_txn_update_oldest&lt;/tt&gt; more frequently in this workload, for some definition of &quot;more frequently&quot;, so that obsolete updates can be freed before the page size hits &lt;tt&gt;memory_page_max&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;For example, we change the end of &lt;tt&gt;__wt_update_serial&lt;/tt&gt; in &lt;tt&gt;btree.i&lt;/tt&gt; to  something like this:&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;if (upd-&amp;gt;next == NULL)&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;    return (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;&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;if (page-&amp;gt;modify-&amp;gt;obsolete_check_txn != WT_TXN_NONE) {&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;    if (!__wt_txn_visible_all(session, page-&amp;gt;modify-&amp;gt;obsolete_check_txn)) {&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;        /* Check if the oldest ID can move forward and re-check. */&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;        __wt_txn_update_oldest(session);&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;        if (!__wt_txn_visible_all(session, page-&amp;gt;modify-&amp;gt;obsolete_check_txn))&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;            return (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;&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;F_CAS_ATOMIC(page, WT_PAGE_RECONCILIATION, ret);&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;/* If we can&apos;t lock it, don&apos;t scan, that&apos;s okay. */&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;if (ret != 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;    return (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;obsolete = __wt_update_obsolete_check(session, page, upd-&amp;gt;next);&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;...&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;Does that make sense?&lt;/p&gt;</comment>
                            <comment id="1017606" author="michael.cahill" created="Sat, 29 Aug 2015 01:55:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_repl_singleThreaded_a7338c436160e259d0b20058f0a9ae4b442ca102_15_08_28_06_06_32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/performance_linux_wt_repl_singleThreaded_a7338c436160e259d0b20058f0a9ae4b442ca102_15_08_28_06_06_32&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This is the same issue as &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; &amp;#8211; if the oldest transaction ID tracked by WiredTiger falls behind, workloads that do many updates to medium-large  documents to hit forced eviction.  The regression was introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2066&quot; title=&quot;Update the oldest transaction ID from eviction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2066&quot;&gt;&lt;del&gt;WT-2066&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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