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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-16056] Periodic throughput pauses during write load on WT</title>
                <link>https://jira.mongodb.org/browse/SERVER-16056</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;test with this SHA&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;there is performance regression comparing to 11-07 and earlier build.&lt;/p&gt;</description>
                <environment></environment>
        <key id="168341">SERVER-16056</key>
            <summary>Periodic throughput pauses during write load on WT</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="dan@mongodb.com">Daniel Pasette</assignee>
                                    <reporter username="rui.zhang">Rui Zhang</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Mon, 10 Nov 2014 21:06:21 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:08 +0000</updated>
                            <resolved>Fri, 21 Nov 2014 14:30:19 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                    <fixVersion>2.8.0-rc1</fixVersion>
                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="769515" author="rui.zhang" created="Thu, 20 Nov 2014 22:32:09 +0000"  >&lt;p&gt;tested MCI build with 217151b66aefddca0a62e92aa095bb4f27dba574&lt;/p&gt;

&lt;p&gt;the chart comparing mmapv1 vs wt for the same 11-20 build.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;mixtrafficwith8threads&quot;&gt;&lt;/a&gt;mix traffic with 8 threads&lt;/h3&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;mmapv1 and wt show similar throughput. The traffic is about 20% write and 80% mix queries&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/57686/57686_11_20_thread_8.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;h3&gt;&lt;a name=&quot;mixtrafficwith16threads&quot;&gt;&lt;/a&gt;mix traffic with 16 threads&lt;/h3&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;throughput is relative smooth,&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/57687/57687_11_20_thread_16.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;h3&gt;&lt;a name=&quot;mixtrafficwith64threads&quot;&gt;&lt;/a&gt;mix traffic with 64 threads&lt;/h3&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;throughput is smooth, but there is a dip in throughput for WT for about 100 sec. disk write (kB_wr) and context switching (cswch and nvcswh) show lots of activities (cswch lower, and nvcswch go crazy, maybe something to do with host OS). No exactly sure what&apos;s going on there, I think it could be another issue.&lt;/li&gt;
&lt;/ul&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/57688/57688_11_20_thread_64.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;overall, no pause for WT&lt;/li&gt;
	&lt;li&gt;behavior is comparable to mmapv1&lt;/li&gt;
	&lt;li&gt;there is a long dip in throughput for WT with 64 thread, need investigation&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;explain of stats&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;kB_wr: kilobytes of wr per second for mongod&lt;/li&gt;
	&lt;li&gt;cswch: total context switch for mongod (add all the thread&apos;s read together)&lt;/li&gt;
	&lt;li&gt;nvcswch: non voluntary context switch (sum of all threads), more details, please refer to pidstat doc&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="768372" author="rui.zhang" created="Wed, 19 Nov 2014 21:00:39 +0000"  >&lt;p&gt;running today&apos;s build, will update when it is done.&lt;/p&gt;</comment>
                            <comment id="764040" author="rui.zhang" created="Fri, 14 Nov 2014 01:02:57 +0000"  >&lt;p&gt;test after applying the above patch to today&apos;s latest master. &lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;there is definitely some improvement over 11-11 build (before the patch), the dip in throughput is not as dramatic&lt;/li&gt;
	&lt;li&gt;there is definitely up and down in throughput&lt;/li&gt;
	&lt;li&gt;periodic disk write is still pretty high comparing to 10-30 build.&lt;/li&gt;
&lt;/ul&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/57005/57005_cp_concurrency_test.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;git log:&lt;/p&gt;
&lt;p/&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;Author: Michael Cahill &amp;lt;....&amp;gt;&lt;/span&gt;&lt;/pre&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:   Thu Nov 13 21:09:21 2014 +1100&lt;/span&gt;&lt;/pre&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;    Add a lock around table operations, so that cursor opens don&apos;t see tables half created or half dropped.&lt;/span&gt;&lt;/pre&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;    Signed-off-by: Rui Zhang &amp;lt;....&amp;gt;&lt;/span&gt;&lt;/pre&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;Author: Michael Cahill &amp;lt;....&amp;gt;&lt;/span&gt;&lt;/pre&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;    Split the schema lock into a lock that prevents concurrent schema-changing operations (create, drop, rename, etc.), and a separate lock that protects the shared handle list. The main goal in the short term is to ensure that checkpoints don&apos;t hold any locks that block cursor opens while doing I/O.&lt;/span&gt;&lt;/pre&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;    Signed-off-by: Rui Zhang &amp;lt;....&amp;gt;&lt;/span&gt;&lt;/pre&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;Author: Kaloian Manassiev &amp;lt;....&amp;gt;&lt;/span&gt;&lt;/pre&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;    SERVER-14062 Cleanup Client::hasWrittenSinceCheckpoint and some usages of cc()&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;    This is in preparation for removing the Global OperationContext registry.&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;    OperationContexts will instead be reachable through the client.&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="763417" author="dan@10gen.com" created="Thu, 13 Nov 2014 15:41:59 +0000"  >&lt;p&gt;This PR in wiredtiger should mostly solve this issue:&lt;br/&gt;
&lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/pull/1380&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/pull/1380&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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