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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-36991] mongo startup by parameter --syslog: mongod 100% cpu usage under big data insert</title>
                <link>https://jira.mongodb.org/browse/SERVER-36991</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;PID USER PR NI VIRT RES SHR S &lt;font color=&quot;#FF0000&quot;&gt;&lt;b&gt;%CPU&lt;/b&gt; &lt;/font&gt;%MEM TIME+ COMMAND &lt;br/&gt;
 29078 root 20 0 6586752 5.919g 6920 S &lt;b&gt;&lt;font color=&quot;#FF0000&quot;&gt;99.7&lt;/font&gt;&lt;/b&gt; 38.2 0:48.07 mongod &lt;br/&gt;
 30297 root 20 0 6586752 5.919g 6920 S 0.3 38.2 0:00.82 mongod &lt;br/&gt;
 30270 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.34 mongod &lt;br/&gt;
 30271 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30272 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:01.02 mongod &lt;br/&gt;
 30274 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.13 mongod &lt;br/&gt;
 30275 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.04 mongod &lt;br/&gt;
 30276 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.33 mongod &lt;br/&gt;
 30277 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.05 mongod &lt;br/&gt;
 30278 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30279 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:01.49 mongod &lt;br/&gt;
 30280 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.96 mongod &lt;br/&gt;
 30281 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30282 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:02.26 mongod &lt;br/&gt;
 30283 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.06 mongod &lt;br/&gt;
 30284 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30285 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.05 mongod &lt;br/&gt;
 30286 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30287 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.07 mongod &lt;br/&gt;
 30291 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.20 mongod &lt;br/&gt;
 30295 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.01 mongod &lt;br/&gt;
 30301 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.01 mongod &lt;br/&gt;
 30304 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.08 mongod &lt;br/&gt;
 30461 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.02 mongod &lt;br/&gt;
 30494 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:01.95 mongod &lt;br/&gt;
 30879 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.23 mongod &lt;br/&gt;
 31477 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.02 mongod &lt;br/&gt;
 31478 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.03 mongod &lt;br/&gt;
 31572 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.02 mongod &lt;br/&gt;
 31917 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod&lt;/p&gt;</description>
                <environment></environment>
        <key id="599594">SERVER-36991</key>
            <summary>mongo startup by parameter --syslog: mongod 100% cpu usage under big data insert</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="nick.brewer">Nick Brewer</assignee>
                                    <reporter username="wynn">wynn zhao</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Sep 2018 06:47:01 +0000</created>
                <updated>Thu, 20 Sep 2018 21:20:54 +0000</updated>
                            <resolved>Thu, 20 Sep 2018 21:20:53 +0000</resolved>
                                    <version>3.4.2</version>
                                                    <component>Logging</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2009861" author="nick.brewer" created="Thu, 20 Sep 2018 21:20:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=wynn&quot; class=&quot;user-hover&quot; rel=&quot;wynn&quot;&gt;wynn&lt;/a&gt; Happy to help. As an aside, I suggest upgrading to the latest MongoDB 3.4 version - currently 3.4.17, as it contains numerous improvements and bug fixes. &lt;/p&gt;

&lt;p&gt;-Nick&lt;/p&gt;


</comment>
                            <comment id="2007405" author="wynn" created="Wed, 19 Sep 2018 04:27:34 +0000"  >&lt;p&gt;Hi Nick&lt;/p&gt;

&lt;p&gt;You can close this issue, if we reproduce it with suitable testing environment, we can reopen it.&lt;/p&gt;

&lt;p&gt;Thanks for your timely and seriously support. Have a nice day!&lt;/p&gt;

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

&lt;p&gt;Best Regards!&lt;/p&gt;

&lt;p&gt;Wynn&lt;/p&gt;</comment>
                            <comment id="2002156" author="nick.brewer" created="Thu, 13 Sep 2018 17:43:13 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=wynn&quot; class=&quot;user-hover&quot; rel=&quot;wynn&quot;&gt;wynn&lt;/a&gt; I&apos;ve attempted to reproduce this, but I haven&apos;t been able to. Using MongoDB 3.4.2 on CentOS 7, I started mongod up first with &lt;tt&gt;-&lt;del&gt;syslog&lt;/tt&gt;, and then &lt;tt&gt;&lt;/del&gt;-logpath (log file)&lt;/tt&gt; - in each case I performed an insert of 3 million documents. The CPU utilization according to &lt;tt&gt;top&lt;/tt&gt; hovered around 3% for both of them:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;--syslog&lt;/tt&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;
&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;  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND&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; 3292 root      20   0  418964 169328  12408 S  3.0  2.3   0:01.91 mongod&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; 3100 root      20   0  418964 169328  12408 S  0.3  2.3   0:00.17 mongod&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;&lt;tt&gt;--logpath&lt;/tt&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;
&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;  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND&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; 3465 root      20   0  413732 164344  12596 S  3.0  2.3   0:01.81 mongod&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; 3442 root      20   0  413732 164344  12596 S  0.3  2.3   0:00.08 mongod&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;Do you have any other suggestions as to how I might be able to reproduce what you&apos;re seeing? If not, I believe we can close this ticket, as it does not appear to represent an underlying bug in MongoDB.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
-Nick&lt;/p&gt;</comment>
                            <comment id="2001429" author="wynn" created="Thu, 13 Sep 2018 01:28:38 +0000"  >&lt;p&gt;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/195889/195889_db.getLogComponents&quot; title=&quot;db.getLogComponents attached to SERVER-36991&quot;&gt;db.getLogComponents&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="2001426" author="wynn" created="Thu, 13 Sep 2018 01:26:23 +0000"  >&lt;p&gt;Hi Nick&lt;/p&gt;

&lt;p&gt;We have same configuration with MongoDB and Servers.&lt;/p&gt;

&lt;p&gt;&#160;&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;[*####@badash-linux-5 ~*]# mongo[####@badash-linux-5 ~]# mongoMongoDB shell version v3.4.2connecting to: mongodb://127.0.0.1:27017MongoDB server version: 3.4.2Server has startup warnings:&#160;2018-09-07T10:27:28.572+0200 I CONTROL&#160; [initandlisten]&#160;2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten] ** WARNING: Access control is not enabled for the database.2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten] **&#160; &#160; &#160; &#160; &#160; Read and write access to data and configuration is unrestricted.2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten]&#160;2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten]&#160;2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is &apos;always&apos;.2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten] **&#160; &#160; &#160; &#160; We suggest setting it to &apos;never&apos;2018-09-07T10:27:28.573+0200 I CONTROL&#160; [initandlisten]&#160;&amp;gt; *db.getLogComponents()*{ &quot;verbosity&quot; : 0, &quot;accessControl&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;command&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;control&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;executor&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;geo&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;index&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;network&quot; : \{ &quot;verbosity&quot; : -1, &quot;asio&quot; : { &quot;verbosity&quot; : -1 }, &quot;bridge&quot; : \{ &quot;verbosity&quot; : -1 } }, &quot;query&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;replication&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;sharding&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;storage&quot; : \{ &quot;verbosity&quot; : -1, &quot;journal&quot; : { &quot;verbosity&quot; : -1 } }, &quot;write&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;ftdc&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;tracking&quot; : \{ &quot;verbosity&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;
&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;[*####@badash-linux-6 ~*]$ mongoMongoDB shell version v3.4.2connecting to: mongodb://127.0.0.1:27017MongoDB server version: 3.4.2Server has startup warnings:&#160;2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten]&#160;2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten] ** WARNING: Access control is not enabled for the database.2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten] **&#160; &#160; &#160; &#160; &#160; Read and write access to data and configuration is unrestricted.2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten]&#160;2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten]&#160;2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is &apos;always&apos;.2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten] **&#160; &#160; &#160; &#160; We suggest setting it to &apos;never&apos;2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten]&#160;2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is &apos;always&apos;.2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten] **&#160; &#160; &#160; &#160; We suggest setting it to &apos;never&apos;2018-09-12T16:38:48.314+0800 I CONTROL&#160; [initandlisten]&#160;&amp;gt; *db.getLogComponents()*{ &quot;verbosity&quot; : 0, &quot;accessControl&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;command&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;control&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;executor&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;geo&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;index&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;network&quot; : \{ &quot;verbosity&quot; : -1, &quot;asio&quot; : { &quot;verbosity&quot; : -1 }, &quot;bridge&quot; : \{ &quot;verbosity&quot; : -1 } }, &quot;query&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;replication&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;sharding&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;storage&quot; : \{ &quot;verbosity&quot; : -1, &quot;journal&quot; : { &quot;verbosity&quot; : -1 } }, &quot;write&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;ftdc&quot; : \{ &quot;verbosity&quot; : -1 }, &quot;tracking&quot; : \{ &quot;verbosity&quot; : -1 }}&amp;gt;&#160;&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;Best Regards!&lt;/p&gt;

&lt;p&gt;Wynn&lt;/p&gt;</comment>
                            <comment id="2001243" author="nick.brewer" created="Wed, 12 Sep 2018 21:30:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=wynn&quot; class=&quot;user-hover&quot; rel=&quot;wynn&quot;&gt;wynn&lt;/a&gt; I don&apos;t see anything unusual there, but this reinforces my belief that this issue is not with the &lt;tt&gt;--syslog&lt;/tt&gt; setting itself, as you should be seeing roughly the same behavior on &lt;tt&gt;badash-linux-5&lt;/tt&gt; as you are on &lt;tt&gt;badash-linux-6&lt;/tt&gt;. Are there any other differences (in terms of configuration, hardware, etc) between these two machines? It would be useful to see the output of &lt;tt&gt;db.getLogComponents()&lt;/tt&gt; from both machines. &lt;/p&gt;

&lt;p&gt;Thanks, &lt;br/&gt;
-Nick&lt;/p&gt;
</comment>
                            <comment id="2000195" author="wynn" created="Wed, 12 Sep 2018 01:42:03 +0000"  >&lt;p&gt;Hi Nick&lt;/p&gt;

&lt;p&gt;rsyslog.conf attached. And the server version as follows:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;####@badash-linux-6 etc&amp;#93;&lt;/span&gt;$ &lt;b&gt;cat /etc/os-release&lt;/b&gt; &lt;br/&gt;
 NAME=&quot;CentOS Linux&quot;&lt;br/&gt;
 VERSION=&quot;7 (Core)&quot;&lt;br/&gt;
 ID=&quot;centos&quot;&lt;br/&gt;
 ID_LIKE=&quot;rhel fedora&quot;&lt;br/&gt;
 VERSION_ID=&quot;7&quot;&lt;br/&gt;
 PRETTY_NAME=&quot;CentOS Linux 7 (Core)&quot;&lt;br/&gt;
 ANSI_COLOR=&quot;0;31&quot;&lt;br/&gt;
 CPE_NAME=&quot;cpe:/o:centos:centos:7&quot;&lt;br/&gt;
 HOME_URL=&quot;https://www.centos.org/&quot;&lt;br/&gt;
 BUG_REPORT_URL=&quot;https://bugs.centos.org/&quot;&lt;/p&gt;

&lt;p&gt;CENTOS_MANTISBT_PROJECT=&quot;CentOS-7&quot;&lt;br/&gt;
 CENTOS_MANTISBT_PROJECT_VERSION=&quot;7&quot;&lt;br/&gt;
 REDHAT_SUPPORT_PRODUCT=&quot;centos&quot;&lt;br/&gt;
 REDHAT_SUPPORT_PRODUCT_VERSION=&quot;7&quot;&lt;/p&gt;

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

&lt;p&gt;Best Regards!&lt;/p&gt;

&lt;p&gt;Wynn&lt;/p&gt;

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

&lt;p&gt;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/195799/195799_server1-rsyslog.conf&quot; title=&quot;server1-rsyslog.conf attached to SERVER-36991&quot;&gt;server1-rsyslog.conf&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;&lt;sup&gt;&lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/195801/195801_server2-rsyslog.conf&quot; title=&quot;server2-rsyslog.conf attached to SERVER-36991&quot;&gt;server2-rsyslog.conf&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/sup&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1999910" author="nick.brewer" created="Tue, 11 Sep 2018 19:53:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=wynn&quot; class=&quot;user-hover&quot; rel=&quot;wynn&quot;&gt;wynn&lt;/a&gt; Have you made any modifications to your system&apos;s syslog configuration? It would be helpful to see your &lt;tt&gt;rsyslog.conf&lt;/tt&gt; file for each of the machines you&apos;ve provided diagnostic data for. It&apos;s worth noting that only one of the machines are seeing increased CPU utilization, despite the fact that they&apos;re both using the &lt;tt&gt;--syslog&lt;/tt&gt; option with similar workloads. &lt;/p&gt;

&lt;p&gt;-Nick&lt;/p&gt;


</comment>
                            <comment id="1995197" author="wynn" created="Thu, 6 Sep 2018 15:03:01 +0000"  >&lt;p&gt;Hi Nick,&lt;/p&gt;

&lt;p&gt;We just use one database include several collections with multi-thread writing and reading(c++ driver write or read, php driver read mostly). When this core cpu reach 100%, all other operation will be very slowly or hang. For example, read data from collections by PHP driver, some times, no data will be got or &quot;no such server&quot; errors reported.&lt;/p&gt;

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

&lt;p&gt;In addition, we modify the start up parameter, &lt;b&gt;remove --syslog and instead by --logpath /dev/null. Finally, after one day test, the cpu is very low and the cpu high issue not be reproduced, every operation looks good currently.&lt;/b&gt;&lt;/p&gt;

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

&lt;p&gt;Best Regards!&lt;/p&gt;

&lt;p&gt;Wynn&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1995104" author="nick.brewer" created="Thu, 6 Sep 2018 14:20:15 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=wynn&quot; class=&quot;user-hover&quot; rel=&quot;wynn&quot;&gt;wynn&lt;/a&gt; Looking at the data provided, it doesn&apos;t appear that there&apos;s substantial CPU used before or after the reboot (where the --syslog option was presumably added):&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;195452_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/195452/195452_Screen+Shot+2018-09-06+at+10.10.58+AM.png&quot; title=&quot;Screen Shot 2018-09-06 at 10.10.58 AM.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;195452&quot; file-preview-title=&quot;Screen Shot 2018-09-06 at 10.10.58 AM.png&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/195452/_thumb_195452.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;I believe the disparity here is due to the fact that, by default, &lt;tt&gt;top&lt;/tt&gt; measures CPU usage percentage as 100% per core, meaning that multi-core systems can easily exceed 100% usage. So this line:&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;29078 root 20 0 6586752 5.919g 6920 S 99.7 38.2 0:48.07 mongod&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;Indicates that mongod is utilizing one core on this 8-core system.&lt;/p&gt;

&lt;p&gt;-Nick&lt;/p&gt;</comment>
                            <comment id="1994615" author="wynn" created="Thu, 6 Sep 2018 01:41:06 +0000"  >&lt;p&gt;Hi Nick,&lt;/p&gt;

&lt;p&gt;diagnostic.data has been attached.&#160;&lt;/p&gt;

&lt;p&gt;Best Regards!&lt;/p&gt;

&lt;p&gt;Wynn&lt;/p&gt;</comment>
                            <comment id="1993634" author="nick.brewer" created="Wed, 5 Sep 2018 12:49:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=wynn&quot; class=&quot;user-hover&quot; rel=&quot;wynn&quot;&gt;wynn&lt;/a&gt; Could you please archive (tar or zip) and upload the &lt;tt&gt;dbpath/diagnostic.data&lt;/tt&gt; directory to this ticket? &lt;/p&gt;

&lt;p&gt;Thanks, &lt;br/&gt;
Nick&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="195452" name="Screen Shot 2018-09-06 at 10.10.58 AM.png" size="57144" author="nick.brewer" created="Thu, 6 Sep 2018 14:16:17 +0000"/>
                            <attachment id="195889" name="db.getLogComponents" size="3943" author="wynn" created="Thu, 13 Sep 2018 01:28:37 +0000"/>
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                            <attachment id="195435" name="diagnostic-data.tar.gz" size="14559887" author="wynn" created="Thu, 6 Sep 2018 01:37:45 +0000"/>
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                            <attachment id="195801" name="server2-rsyslog.conf" size="3232" author="wynn" created="Wed, 12 Sep 2018 01:37:18 +0000"/>
                            <attachment id="195800" name="server2-rsyslog.conf" size="3232" author="wynn" created="Wed, 12 Sep 2018 01:36:48 +0000"/>
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                        <customfieldname>Steps To Reproduce</customfieldname>
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                            <customfieldvalue>&lt;p&gt;&lt;b&gt;1. MongoDB server version: 3.4.2&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;2. startup mongo with parameter --syslog&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;&#160; &#160;&#160;/usr/local/mongodb/bin/mongod --fork --dbpath=/data/db &lt;font color=&quot;#FF0000&quot;&gt;&lt;b&gt;--syslog&lt;/b&gt;&lt;/font&gt; --port=27017 --bind_ip=127.0.0.1,136.227.20.70&lt;/p&gt;

&lt;p&gt;&lt;b&gt;3. top -H -p&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;PID USER PR NI VIRT RES SHR S &lt;font color=&quot;#FF0000&quot;&gt;&lt;b&gt;%CPU&lt;/b&gt;&lt;/font&gt; %MEM TIME+ COMMAND &lt;br/&gt;
 29078 root 20 0 6586752 5.919g 6920 S &lt;font color=&quot;#FF0000&quot;&gt;&lt;b&gt;99.7&lt;/b&gt;&lt;/font&gt; 38.2 0:48.07 mongod &lt;br/&gt;
 30297 root 20 0 6586752 5.919g 6920 S 0.3 38.2 0:00.82 mongod &lt;br/&gt;
 30270 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.34 mongod &lt;br/&gt;
 30271 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30272 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:01.02 mongod &lt;br/&gt;
 30274 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.13 mongod &lt;br/&gt;
 30275 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.04 mongod &lt;br/&gt;
 30276 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.33 mongod &lt;br/&gt;
 30277 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.05 mongod &lt;br/&gt;
 30278 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30279 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:01.49 mongod &lt;br/&gt;
 30280 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.96 mongod &lt;br/&gt;
 30281 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30282 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:02.26 mongod &lt;br/&gt;
 30283 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.06 mongod &lt;br/&gt;
 30284 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30285 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.05 mongod &lt;br/&gt;
 30286 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod &lt;br/&gt;
 30287 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.07 mongod &lt;br/&gt;
 30291 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.20 mongod &lt;br/&gt;
 30295 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.01 mongod &lt;br/&gt;
 30301 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.01 mongod &lt;br/&gt;
 30304 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.08 mongod &lt;br/&gt;
 30461 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.02 mongod &lt;br/&gt;
 30494 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:01.95 mongod &lt;br/&gt;
 30879 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.23 mongod &lt;br/&gt;
 31477 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.02 mongod &lt;br/&gt;
 31478 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.03 mongod &lt;br/&gt;
 31572 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.02 mongod &lt;br/&gt;
 31917 root 20 0 6586752 5.919g 6920 S 0.0 38.2 0:00.00 mongod&lt;/p&gt;

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

&lt;p&gt;&lt;b&gt;4. thread of high cpu usage with common output by &quot;pstack&#160;29078&quot;&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Thread 1 (process 29078):&lt;br/&gt;
#0 0x00007f0e6bd2585d in &lt;font color=&quot;#FF0000&quot;&gt;write ()&lt;/font&gt; from /lib64/libc.so.6&lt;br/&gt;
#1 0x00007f0e6bcb1fb3 in _IO_new_file_write () from /lib64/libc.so.6&lt;br/&gt;
#2 0x00007f0e6bcb274f in _&lt;em&gt;GI&lt;/em&gt;_IO_file_xsputn () from /lib64/libc.so.6&lt;br/&gt;
#3 0x00007f0e6bc8469d in vfprintf () from /lib64/libc.so.6&lt;br/&gt;
#4 0x00007f0e6bcb0028 in vdprintf () from /lib64/libc.so.6&lt;br/&gt;
#5 0x00007f0e6bc8db17 in dprintf () from /lib64/libc.so.6&lt;br/&gt;
#6 0x00007f0e6bd2e47e in __vsyslog_chk () from /lib64/libc.so.6&lt;br/&gt;
#7 0x00007f0e6bd2e622 in __syslog_chk () from /lib64/libc.so.6&lt;br/&gt;
#8 0x000055bf16b15e9c in &lt;b&gt;&lt;font color=&quot;#FF0000&quot;&gt;mongo::logger::SyslogAppender&amp;lt;mongo::logger::MessageEventEphemeral&amp;gt;::append(mongo::logger::MessageEventEphemeral const&amp;amp;) ()&lt;/font&gt;&lt;/b&gt;&lt;br/&gt;
#9 0x000055bf171abca4 in mongo::logger::LogDomain&amp;lt;mongo::logger::MessageEventEphemeral&amp;gt;::append(mongo::logger::MessageEventEphemeral const&amp;amp;) ()&lt;br/&gt;
#10 0x000055bf171aa849 in mongo::logger::LogstreamBuilder::~LogstreamBuilder() ()&lt;br/&gt;
#11 0x000055bf16b1a1a1 in mongo::assembleResponse(mongo::OperationContext*, mongo::Message&amp;amp;, mongo::DbResponse&amp;amp;, mongo::HostAndPort const&amp;amp;) ()&lt;br/&gt;
#12 0x000055bf1670a54d in mongo::ServiceEntryPointMongod::_sessionLoop(std::shared_ptr&amp;lt;mongo::transport::Session&amp;gt; const&amp;amp;) ()&lt;br/&gt;
#13 0x000055bf1670ae8d in std::_Function_handler&amp;lt;void (std::shared_ptr&amp;lt;mongo::transport::Session&amp;gt; const&amp;amp;), mongo::ServiceEntryPointMongod::startSession(std::shared_ptr&amp;lt;mongo::transport::Session&amp;gt;)::{lambda(std::shared_ptr&amp;lt;mongo::transport::Session&amp;gt; const&amp;amp;)#1}&amp;gt;::_M_invoke(std::_Any_data const&amp;amp;, std::shared_ptr&amp;lt;mongo::transport::Session&amp;gt; const&amp;amp;) ()&lt;br/&gt;
#14 0x000055bf17379292 in mongo::(anonymous namespace)::runFunc(void*) ()&lt;br/&gt;
#15 0x00007f0e6c006e25 in start_thread () from /lib64/libpthread.so.0&lt;br/&gt;
#16 0x00007f0e6bd3434d in clone () from /lib64/libc.so.6&lt;/p&gt;

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

&lt;p&gt;&lt;b&gt;5.&#160;strace -T -tt -e trace=all -s 10000 -fp 29078&lt;/b&gt;&lt;/p&gt;


&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.945831 &lt;b&gt;&lt;font color=&quot;#FF0000&quot;&gt;futex&lt;/font&gt;&lt;/b&gt;(0x55e854e411a8, FUTEX_WAKE_PRIVATE, 1) = 0 &amp;lt;0.000017&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.945899 &lt;b&gt;&lt;font color=&quot;#FF0000&quot;&gt;futex&lt;/font&gt;&lt;/b&gt;(0x55e854e411d4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 56277, {1536126593, 955806828}, ffffffff) = -1 ETIMEDOUT (Connection timed out) &amp;lt;0.009955&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.955895 &lt;b&gt;&lt;font color=&quot;#FF0000&quot;&gt;futex&lt;/font&gt;&lt;/b&gt;(0x55e854e411a8, FUTEX_WAKE_PRIVATE, 1) = 0 &amp;lt;0.000013&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.955940 &lt;b&gt;&lt;font color=&quot;#FF0000&quot;&gt;futex&lt;/font&gt;&lt;/b&gt;(0x55e854e411d4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 56279, {1536126593, 965887819}, ffffffff) = -1 ETIMEDOUT (Connection timed out) &amp;lt;0.009992&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.965976 futex(0x55e854e411a8, FUTEX_WAKE_PRIVATE, 1) = 0 &amp;lt;0.000015&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.966025 futex(0x55e854e411d4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 56281, {1536126593, 975969073}, ffffffff) = -1 ETIMEDOUT (Connection timed out) &amp;lt;0.009991&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.976056 futex(0x55e854e411a8, FUTEX_WAKE_PRIVATE, 1) = 0 &amp;lt;0.000013&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.976101 futex(0x55e854e411d4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 56283, {1536126593, 986048750}, ffffffff) = -1 ETIMEDOUT (Connection timed out) &amp;lt;0.009996&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.986135 futex(0x55e854e411a8, FUTEX_WAKE_PRIVATE, 1) = 0 &amp;lt;0.000018&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.986208 futex(0x55e854e411d4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 56285, {1536126593, 996128238}, ffffffff) = -1 ETIMEDOUT (Connection timed out) &amp;lt;0.009960&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.996214 futex(0x55e854e411a8, FUTEX_WAKE_PRIVATE, 1) = 0 &amp;lt;0.000021&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29078&amp;#93;&lt;/span&gt; 13:49:53.996263 futex(0x55e854e411d4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 56287, {1536126594, 6205991}, ffffffff &amp;lt;unfinished ...&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000072 &amp;lt;... futex resumed&amp;gt; ) = -1 ETIMEDOUT (Connection timed out) &amp;lt;0.997855&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000103 futex(0x55e8587277e8, FUTEX_WAKE_PRIVATE, 1) = 0 &amp;lt;0.000013&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000188 open(&quot;/proc/29076/stat&quot;, O_RDONLY) = 61 &amp;lt;0.000024&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000258 fstat(61, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 &amp;lt;0.000013&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000309 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f46eaba3000 &amp;lt;0.000020&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000361 read(61, &quot;29076 (mongod) S 1 29075 29075 0 -1 1077944384 218410 0 33 0 794 25000 0 0 20 0 27 0 303434491 2047733760 423496 18446744073709551615 94456257441792 94456302719232 140724326755424 140724326748608 139942541384005 0 8405507 4097 3308 18446744073709551615 0 0 17 5 0 0 43 0 0 94456302726464 94456304527088 94456334974976 140724326758539 140724326758636 140724326758636 140724326760410 0\n&quot;, 1024) = 384 &amp;lt;0.000032&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000437 close(61) = 0 &amp;lt;0.000052&amp;gt;&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;pid 29089&amp;#93;&lt;/span&gt; 13:49:54.000538 munmap(0x7f46eaba3000, 4096) = 0 &amp;lt;0.000027&amp;gt;&lt;/p&gt;

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

&lt;p&gt;&lt;b&gt;6. big size data insert mongodb: mongostat&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn time&lt;br/&gt;
 2 *0 *0 *0 0 2|0 1.2% 76.7% 0 6.30G 5.96G 0|0 0|0 2.66m 54.3k 10 Sep 5 14:37:09.504&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 1.2% 76.7% 0 6.30G 5.96G 0|0 0|0 2.68m 54.2k 10 Sep 5 14:37:10.504&lt;br/&gt;
 4 *0 *0 *0 0 3|0 1.3% 76.8% 0 6.30G 5.96G 0|0 0|0 5.33m 54.4k 10 Sep 5 14:37:11.503&lt;br/&gt;
 1 *0 *0 *0 0 4|0 1.3% 76.8% 0 6.30G 5.96G 0|0 0|0 3.28m 54.6k 10 Sep 5 14:37:12.504&lt;br/&gt;
 4 *0 *0 *0 0 3|0 1.4% 76.9% 0 6.30G 5.96G 0|0 0|0 5.33m 54.4k 10 Sep 5 14:37:13.504&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 1.4% 76.9% 0 6.30G 5.96G 0|0 0|0 2.63m 54.2k 10 Sep 5 14:37:14.505&lt;br/&gt;
 3 *0 *0 *0 0 5|0 1.5% 77.0% 0 6.30G 5.96G 0|0 0|0 2.71m 54.6k 10 Sep 5 14:37:15.504&lt;br/&gt;
 2 *0 *0 *0 0 3|0 1.5% 77.0% 0 6.30G 5.96G 0|0 0|0 5.35m 54.3k 10 Sep 5 14:37:16.503&lt;br/&gt;
 2 *0 *0 *0 0 7|0 1.6% 77.1% 0 6.30G 5.96G 0|0 0|0 2.66m 56.9k 10 Sep 5 14:37:17.504&lt;br/&gt;
 2 *0 *0 *0 0 3|0 1.6% 77.2% 0 6.30G 5.96G 0|0 0|0 5.35m 54.3k 10 Sep 5 14:37:18.504&lt;br/&gt;
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn time&lt;br/&gt;
 3 *0 *0 *0 0 4|0 1.7% 77.2% 0 6.30G 5.96G 0|0 0|0 2.69m 54.4k 10 Sep 5 14:37:19.504&lt;br/&gt;
 *0 *0 *0 *0 0 2|0 1.8% 77.2% 0 6.30G 5.96G 0|0 0|0 2.67m 54.2k 10 Sep 5 14:37:20.504&lt;br/&gt;
 3 *0 *0 *0 0 3|0 1.8% 77.3% 0 6.30G 5.96G 0|0 0|0 5.35m 54.5k 10 Sep 5 14:37:21.504&lt;br/&gt;
 2 *0 1 *0 0 5|0 1.9% 77.3% 0 6.30G 5.96G 0|0 0|0 3.26m 54.6k 10 Sep 5 14:37:22.504&lt;br/&gt;
 3 *0 *0 *0 0 2|0 1.9% 77.4% 0 6.30G 5.96G 0|0 0|0 5.32m 54.3k 10 Sep 5 14:37:23.505&lt;br/&gt;
 1 *0 *0 *0 0 3|0 2.0% 77.5% 0 6.30G 5.96G 0|0 0|0 2.71m 54.3k 10 Sep 5 14:37:24.503&lt;br/&gt;
 2 *0 *0 *0 0 3|0 2.0% 77.5% 0 6.30G 5.96G 0|0 0|0 2.63m 54.5k 10 Sep 5 14:37:25.504&lt;br/&gt;
 2 *0 *0 *0 0 4|0 2.1% 77.6% 0 6.30G 5.96G 0|0 0|0 5.33m 54.5k 10 Sep 5 14:37:26.504&lt;br/&gt;
 2 *0 *0 *0 0 2|0 2.1% 77.6% 0 6.30G 5.96G 0|0 0|0 2.69m 54.2k 10 Sep 5 14:37:27.505&lt;br/&gt;
 2 *0 *0 *0 0 3|0 2.2% 77.7% 0 6.30G 5.96G 0|0 0|0 5.34m 54.3k 10 Sep 5 14:37:28.504&lt;br/&gt;
insert query update delete getmore command dirty used flushes vsize res qrw arw net_in net_out conn time&lt;br/&gt;
 3 *0 *0 *0 0 3|0 2.2% 77.7% 0 6.30G 5.96G 0|0 0|0 2.67m 54.3k 10 Sep 5 14:37:29.503&lt;br/&gt;
 1 *0 *0 *0 0 3|0 2.3% 77.8% 0 6.30G 5.96G 0|0 0|0 5.35m 54.3k 10 Sep 5 14:37:30.503&lt;br/&gt;
 2 *0 *0 *0 0 2|0 2.3% 77.8% 0 6.30G 5.96G 0|0 0|0 2.66m 53.8k 10 Sep 5 14:37:31.512&lt;br/&gt;
 2 *0 1 *0 0 9|0 2.4% 77.9% 0 6.30G 5.96G 0|0 0|0 3.31m 57.6k 10 Sep 5 14:37:32.503&lt;br/&gt;
 4 *0 *0 *0 0 4|0 2.4% 78.0% 0 6.30G 5.96G 0|0 0|0 5.36m 54.6k 10 Sep 5 14:37:33.503&lt;br/&gt;
 *0 *0 *0 *0 0 3|0 2.5% 78.0% 0 6.30G 5.96G 0|0 0|0 2.64m 54.2k 10 Sep 5 14:37:34.504&lt;br/&gt;
 3 *0 *0 *0 0 3|0 2.5% 78.1% 0 6.30G 5.96G 0|0 0|0 5.32m 54.4k 10 Sep 5 14:37:35.506&lt;br/&gt;
 1 *0 *0 *0 0 3|0 2.6% 78.1% 0 6.30G 5.96G 0|0 0|0 2.71m 54.3k 10 Sep 5 14:37:36.504&lt;br/&gt;
 3 *0 *0 *0 0 3|0 2.7% 78.1% 0 6.30G 5.96G 0|0 0|0 2.63m 54.3k 10 Sep 5 14:37:37.503&lt;br/&gt;
 1 *0 *0 *0 0 2|0 2.7% 78.2% 0 6.30G 5.96G 0|0 0|0 5.33m 54.3k 10 Sep 5 14:37:38.504&lt;/p&gt;</customfieldvalue>

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