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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-17121] Throughput Dropout on mongo-sim insert-update-query workload with WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-17121</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running mongo-sim insert-update-query workload experiencing periods of very low throughput. &lt;/p&gt;

&lt;p&gt;This reproduces both on RC7 and latest in v3.0 (&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b70d96e06c2c3fa86d95f6719ab1815a98db77a9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;b70d96e06c2c3fa86d95f6719ab1815a98db77a9&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;mongo-sim is here, with instructions to build: &lt;a href=&quot;https://github.com/10gen/mongo-sim&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-sim&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="181558">SERVER-17121</key>
            <summary>Throughput Dropout on mongo-sim insert-update-query workload 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="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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>28qa</label>
                    </labels>
                <created>Thu, 29 Jan 2015 21:05:35 +0000</created>
                <updated>Tue, 17 Mar 2015 22:24:51 +0000</updated>
                            <resolved>Thu, 19 Feb 2015 19:35:32 +0000</resolved>
                                    <version>3.0.0-rc7</version>
                                    <fixVersion>3.0.0-rc9</fixVersion>
                    <fixVersion>3.1.0</fixVersion>
                                    <component>Performance</component>
                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="832956" author="ramon.fernandez" created="Thu, 19 Feb 2015 19:35:32 +0000"  >&lt;p&gt;Ticket has been fixed by the latest &lt;a href=&quot;https://github.com/mongodb/mongo/commit/27e6efa8fee6a78ae549365093736934dc089eeb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WT drop in master&lt;/a&gt; as per entry in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/third_party/wiredtiger/NEWS.MONGODB#L151&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;NEWS.MONGODB&lt;/a&gt;:&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;
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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;commit 0d85a9716b786de5fc90c00fb31765ade8aefd1f&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;Author: Michael Cahill &amp;lt;michael.cahill@wiredtiger.com&amp;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;Date:   Wed Feb 11 17:48:03 2015 +1100&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;    Check if a page was recently split before doing forced eviction.  We used to do this, but it got lost in a recent reorg of&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_page_release.  This change should mean that after an in-memory split, application threads that are appending have time t&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;&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;o move to the new page at the end of the tree, rather than getting stuck trying to force out a page.&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;   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;    SERVER-16938, SERVER-17121&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;Fix also &lt;a href=&quot;https://github.com/mongodb/mongo/commit/ec116a4be6ca7347fe8688c14aeba3c4d4e40873&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;backported to v3.0&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="832362" author="dan@10gen.com" created="Thu, 19 Feb 2015 00:37:44 +0000"  >&lt;p&gt;fix will come in next WT drop.&lt;/p&gt;</comment>
                            <comment id="831136" author="david.daly" created="Tue, 17 Feb 2015 22:47:08 +0000"  >&lt;p&gt;Missed the mongod log file on earlier graph. Here&apos;s the two key lines from it. &lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/65014/65014_rc9mongolog.png&quot; width=&quot;600&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bruce.lucas%4010gen.com&quot; class=&quot;user-hover&quot; rel=&quot;bruce.lucas@10gen.com&quot;&gt;bruce.lucas@10gen.com&lt;/a&gt; does A-B, C-D look like &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16662&quot; title=&quot;Extended pauses in WiredTiger when workers greatly exceeds number of cores&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16662&quot;&gt;&lt;del&gt;SERVER-16662&lt;/del&gt;&lt;/a&gt; to you?&lt;/p&gt;</comment>
                            <comment id="817068" author="benjamin.becker" created="Thu, 29 Jan 2015 23:49:22 +0000"  >&lt;p&gt;Note that you can run the command listed in the repro steps, or:&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;./insert_update_query-sim -e 10000000 -t 100 -c 7&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;This stand-alone binary can be distributed with minimal shared lib deps, as long as it was built on a machine with a static build of libmongoc.&lt;/p&gt;</comment>
                            <comment id="816949" author="david.daly" created="Thu, 29 Jan 2015 21:59:48 +0000"  >&lt;p&gt;Reproduced on RC6 also. &lt;/p&gt;</comment>
                            <comment id="816894" author="david.daly" created="Thu, 29 Jan 2015 21:06:39 +0000"  >&lt;p&gt;May be the same as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17115&quot; title=&quot;insert workload stalls on oplog truncates&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17115&quot;&gt;&lt;del&gt;SERVER-17115&lt;/del&gt;&lt;/a&gt;. Putting info here. &lt;/p&gt;</comment>
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            <issuekey id="181514">SERVER-17115</issuekey>
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mongo-sim  -w workloads/insert_update_query -e 10000000 -t 100 -c 7&lt;/p&gt;

&lt;p&gt;Running on linux with SSD. &lt;/p&gt;

&lt;p&gt;Running on RC7 and &lt;a href=&quot;https://mci.10gen.com/task/mongodb_mongo_v3.0_linux_64_b70d96e06c2c3fa86d95f6719ab1815a98db77a9_15_01_29_16_47_02_compile_linux_64&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mci.10gen.com/task/mongodb_mongo_v3.0_linux_64_b70d96e06c2c3fa86d95f6719ab1815a98db77a9_15_01_29_16_47_02_compile_linux_64&lt;/a&gt;&lt;/p&gt;</customfieldvalue>

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