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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-47201] High CPU usage during insert</title>
                <link>https://jira.mongodb.org/browse/SERVER-47201</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have a 3 shards cluster, but as soon as we start to load data, the cpu usage goes up to 100%, no other operation goes on during that time, IO is very low, we have pretty much memory (60GB), we&apos;re unable to go live because of this issue, any one can help with this?&lt;/p&gt;

&lt;p&gt;Here is out conf file:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;cat /data/mongodb/shard1/mongod.conf&lt;br/&gt;
systemLog:&lt;br/&gt;
 destination: file&lt;br/&gt;
 logAppend: true&lt;br/&gt;
 logRotate: reopen&lt;br/&gt;
 path: /data/mongodb/shard1/log/mongod.log&lt;br/&gt;
operationProfiling:&lt;br/&gt;
 slowOpThresholdMs: &quot;10000&quot;&lt;br/&gt;
 mode: &quot;off&quot;&lt;br/&gt;
storage:&lt;br/&gt;
 dbPath: /data/mongodb/shard1/data&lt;br/&gt;
 journal:&lt;br/&gt;
 enabled: true&lt;br/&gt;
 commitIntervalMs: 500&lt;br/&gt;
 wiredTiger:&lt;br/&gt;
 engineConfig:&lt;br/&gt;
 cacheSizeGB: 60&lt;br/&gt;
processManagement:&lt;br/&gt;
 fork: true&lt;br/&gt;
 pidFilePath: /data/mongodb/shard1/run/mongod.pid&lt;br/&gt;
net:&lt;br/&gt;
 port: 27001&lt;br/&gt;
 bindIp: 0.0.0.0&lt;br/&gt;
replication:&lt;br/&gt;
 replSetName: shard1&lt;br/&gt;
sharding:&lt;br/&gt;
 clusterRole: shardsvr&lt;br/&gt;
storage.wiredTiger.engineConfig.configString: &quot;eviction_dirty_target=60,eviction_dirty_trigger=80,eviction=(threads_min=1,threads_max=2)&quot;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Here is some mongostat info:&lt;/p&gt;

&lt;p&gt;insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn set repl time&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 1 35.8G 33.8G 0|0 1|0 859b 9.18k 43 shard1 PRI Mar 28 00:57:34.858&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 778b 12.3k 43 shard1 PRI Mar 28 00:57:49.859&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 912b 16.3k 43 shard1 PRI Mar 28 00:58:04.858&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 1.03k 12.7k 43 shard1 PRI Mar 28 00:58:19.858&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 1 35.8G 33.8G 0|0 1|0 625b 9.09k 43 shard1 PRI Mar 28 00:58:34.859&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 932b 17.3k 43 shard1 PRI Mar 28 00:58:49.858&lt;br/&gt;
 *0 *0 *0 *0 0 1|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 530b 8.68k 43 shard1 PRI Mar 28 00:59:04.858&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 1.08k 12.7k 43 shard1 PRI Mar 28 00:59:19.859&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 1 35.8G 33.8G 0|0 1|0 593b 13.9k 43 shard1 PRI Mar 28 00:59:34.858&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 702b 12.2k 43 shard1 PRI Mar 28 00:59:49.858&lt;br/&gt;
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn set repl time&lt;br/&gt;
 *0 *0 *0 *0 0 1|0 0.0% 53.7% 0 35.8G 33.8G 0|0 1|0 636b 11.2k 43 shard1 PRI Mar 28 01:00:04.858&lt;br/&gt;
 273 *0 *0 *0 8 9|0 0.2% 53.7% 0 35.8G 33.8G 0|0 1|0 168k 217k 46 shard1 PRI Mar 28 01:00:19.854&lt;br/&gt;
 9696 *0 *0 *0 337 346|0 4.9% 54.1% 1 35.9G 34.0G 0|0 1|0 5.90m 7.17m 47 shard1 PRI Mar 28 01:00:34.860&lt;br/&gt;
 10007 *0 *0 *0 322 314|0 10.1% 54.5% 0 36.2G 34.3G 0|0 1|0 6.04m 7.37m 49 shard1 PRI Mar 28 01:00:49.858&lt;br/&gt;
 10489 *0 *0 *0 350 362|0 15.1% 55.0% 0 36.4G 34.6G 0|0 1|1 6.37m 7.75m 49 shard1 PRI Mar 28 01:01:04.856&lt;br/&gt;
 10776 *0 *0 *0 348 359|0 20.3% 55.4% 0 36.7G 34.8G 0|0 1|0 6.52m 7.94m 49 shard1 PRI Mar 28 01:01:19.857&lt;br/&gt;
 7538 *0 *0 *0 205 196|0 23.9% 55.7% 0 36.9G 35.0G 0|0 1|0 4.51m 5.49m 49 shard1 PRI Mar 28 01:01:34.868&lt;br/&gt;
 4015 *0 *0 *0 36 2|0 25.7% 55.9% 0 37.0G 35.1G 0|0 1|0 2.30m 2.83m 48 shard1 PRI Mar 28 01:01:49.866&lt;br/&gt;
 3500 *0 *0 *0 34 2|0 27.4% 56.0% 0 37.1G 35.2G 0|0 1|1 2.00m 2.46m 48 shard1 PRI Mar 28 01:02:04.854&lt;br/&gt;
 3846 *0 *0 *0 35 2|0 29.1% 56.2% 0 37.2G 35.3G 0|0 1|0 2.20m 2.71m 49 shard1 PRI Mar 28 01:02:19.875&lt;br/&gt;
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn set repl time&lt;br/&gt;
 3445 *0 *0 *0 54 2|0 30.6% 56.3% 0 37.3G 35.4G 0|0 1|0 1.98m 2.45m 48 shard1 PRI Mar 28 01:02:34.858&lt;br/&gt;
 3867 *0 *0 *0 37 2|0 32.4% 56.5% 0 37.4G 35.5G 0|0 1|0 2.21m 2.71m 48 shard1 PRI Mar 28 01:02:49.857&lt;br/&gt;
 3795 *0 *0 *0 35 2|0 34.2% 56.6% 0 37.5G 35.6G 0|0 1|0 2.17m 2.67m 48 shard1 PRI Mar 28 01:03:04.880&lt;br/&gt;
 3882 *0 *0 *0 33 2|0 36.1% 56.8% 0 37.6G 35.7G 0|0 1|0 2.22m 2.74m 47 shard1 PRI Mar 28 01:03:19.868&lt;br/&gt;
 3784 *0 *0 *0 35 2|0 37.9% 56.9% 0 37.7G 35.8G 0|0 1|1 2.17m 2.65m 47 shard1 PRI Mar 28 01:03:34.864&lt;br/&gt;
 3791 *0 *0 *0 35 2|0 39.6% 57.1% 0 37.8G 35.9G 0|0 1|0 2.16m 2.66m 47 shard1 PRI Mar 28 01:03:49.875&lt;br/&gt;
 4070 *0 *0 *0 28 1|0 41.5% 57.3% 0 37.9G 36.0G 0|0 1|0 2.33m 2.86m 47 shard1 PRI Mar 28 01:04:04.869&lt;br/&gt;
 3992 *0 *0 *0 1 2|0 43.3% 57.4% 0 38.0G 36.1G 0|0 1|0 2.28m 1.22m 47 shard1 PRI Mar 28 01:04:19.866&lt;br/&gt;
 3679 *0 *0 *0 0 2|0 45.0% 57.6% 0 38.1G 36.2G 0|0 1|0 2.09m 1.15m 48 shard1 PRI Mar 28 01:04:34.854&lt;br/&gt;
 3857 *0 *0 *0 0 2|0 46.9% 57.7% 0 38.2G 36.3G 0|0 1|0 2.19m 35.6k 48 shard1 PRI Mar 28 01:04:49.857&lt;br/&gt;
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn set repl time&lt;br/&gt;
 2088 *0 *0 *0 0 2|0 47.8% 57.8% 0 38.3G 36.4G 0|0 1|0 1.19m 1.14m 48 shard1 PRI Mar 28 01:05:04.860&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 47.7% 57.8% 0 38.3G 36.4G 0|0 1|0 737b 12.1k 48 shard1 PRI Mar 28 01:05:19.876&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Here is some iostat info:&lt;/p&gt;

&lt;p&gt;avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 99.32 0.00 0.66 0.00 0.00 0.02&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 13.73 499.00 275.53 22978.40 6031.20 74.91 2.68 3.46 1.00 7.92 0.10 7.67&lt;br/&gt;
dm-0 0.00 0.00 0.00 0.13 0.00 0.80 12.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dm-2 0.00 0.00 0.00 39.20 0.00 198.93 10.15 0.14 3.67 0.00 3.67 0.07 0.26&lt;br/&gt;
dm-3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dm-4 0.00 0.00 499.00 249.87 22978.40 5830.67 76.94 2.58 3.44 1.00 8.32 0.10 7.53&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1298087">SERVER-47201</key>
            <summary>High CPU usage during insert</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="13204">Community Answered</resolution>
                                        <assignee username="dmitry.agranat@mongodb.com">Dmitry Agranat</assignee>
                                    <reporter username="lsh2273@hotmail.com">Eddy Li</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Mar 2020 10:41:09 +0000</created>
                <updated>Fri, 27 Oct 2023 15:56:35 +0000</updated>
                            <resolved>Tue, 28 Apr 2020 10:08:58 +0000</resolved>
                                    <version>4.2.2</version>
                                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3058118" author="dmitry.agranat" created="Tue, 28 Apr 2020 10:08:42 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lsh2273%40hotmail.com&quot; class=&quot;user-hover&quot; rel=&quot;lsh2273@hotmail.com&quot;&gt;lsh2273@hotmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                            <comment id="3026815" author="dmitry.agranat" created="Mon, 6 Apr 2020 07:57:21 +0000"  >&lt;p&gt;Yes &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lsh2273%40hotmail.com&quot; class=&quot;user-hover&quot; rel=&quot;lsh2273@hotmail.com&quot;&gt;lsh2273@hotmail.com&lt;/a&gt;, there were several known issues in 4.2.0 version. Please rerun this test with the MongoDB 4.2.5 version after removing any non-default settings.&lt;/p&gt;</comment>
                            <comment id="3022585" author="lsh2273@hotmail.com" created="Thu, 2 Apr 2020 02:56:33 +0000"  >&lt;p&gt;Is there any known issue with 4.2.0 version? I changed the default WT setting because the performance was even worse with the default setting.&lt;/p&gt;

&lt;p&gt;Thanks ,&lt;br/&gt;
Eddy&lt;/p&gt;</comment>
                            <comment id="3020673" author="dmitry.agranat" created="Wed, 1 Apr 2020 10:44:35 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lsh2273%40hotmail.com&quot; class=&quot;user-hover&quot; rel=&quot;lsh2273@hotmail.com&quot;&gt;lsh2273@hotmail.com&lt;/a&gt;, thank you for uploading the requested information. &lt;/p&gt;

&lt;p&gt;I couple of observations:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Under &quot;Affected versions&quot; you&apos;ve marked 4.2.2 as the version you are using but from the provided data I see this is 4.2.0&lt;/li&gt;
	&lt;li&gt;I also see you are using non-default wt setting, specifically: &lt;tt&gt;configString:eviction_dirty_target=60,eviction_dirty_trigger=80,eviction=(threads_min=1,threads_max=2)&lt;/tt&gt;.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Could you please rerun this test with the &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/4.2/#mar-26-2020&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB 4.2.5&lt;/a&gt; version after removing any non-default settings? This will help us to create a reliable baseline.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                            <comment id="3019169" author="lsh2273@hotmail.com" created="Tue, 31 Mar 2020 15:05:45 +0000"  >&lt;p&gt;Hi Dima,&lt;/p&gt;

&lt;p&gt;Thanks for looking into this issue, I&apos;ve uploaded the log.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Eddy&lt;/p&gt;</comment>
                            <comment id="3018050" author="dmitry.agranat" created="Tue, 31 Mar 2020 12:21:29 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lsh2273%40hotmail.com&quot; class=&quot;user-hover&quot; rel=&quot;lsh2273@hotmail.com&quot;&gt;lsh2273@hotmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Would you please archive (tar or zip) the mongod.log files and the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; directory (the contents are described &lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) and upload them to this &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/e0d7a776-6113-47de-b7df-7a75dfbf02a1.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;support uploader&lt;/a&gt; location?&lt;/p&gt;

&lt;p&gt;Files uploaded to this portal are visible only to MongoDB employees and are routinely deleted after some time.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
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