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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>
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<item>
            <title>[SERVER-4786] Random sampling for profiling and logging</title>
                <link>https://jira.mongodb.org/browse/SERVER-4786</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add a new &lt;tt&gt;sampleRate&lt;/tt&gt; parameter to the profile command. This parameter can take values on the interval [0, 1], and is set to 1 by default on startup. The behavior of &lt;tt&gt;sampleRate&lt;/tt&gt; is as follows for logging:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If the logLevel is 0, then we log a slow command that exceeds the &lt;tt&gt;slowms&lt;/tt&gt; with probability given by &lt;tt&gt;sampleRate&lt;/tt&gt;. Commands whose latency is less than &lt;tt&gt;slowms&lt;/tt&gt;, as before, are not logged.&lt;/li&gt;
	&lt;li&gt;If the logLevel is 1 or higher, then all commands are logged. The &lt;tt&gt;sampleRate&lt;/tt&gt; has no affect in this case.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;For creating &lt;tt&gt;system.profile&lt;/tt&gt; entries, the behavior of &lt;tt&gt;sampleRate&lt;/tt&gt; is as follows:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If the profiling level is 0, then no profile entries are created and &lt;tt&gt;sampleRate&lt;/tt&gt; takes no affect.&lt;/li&gt;
	&lt;li&gt;If the profiling level is 1, then an operation exceeding &lt;tt&gt;slowms&lt;/tt&gt; is profiled with probability given by &lt;tt&gt;sampleRate&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;If the profiling level is 2, then all operations are profiled with probability given by &lt;tt&gt;sampleRate&lt;/tt&gt;, regardless of latency.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There are three ways to set the profiler &lt;tt&gt;sampleRate&lt;/tt&gt;. The first is by running the &lt;tt&gt;profile&lt;/tt&gt; command. For example, the following command indicates that the server should profile 10% of operations slower than 30ms:&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;db.runCommand({profile: 2, slowms: 30, sampleRate: 0.1});&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;This command will return the previous settings of &lt;tt&gt;profile&lt;/tt&gt;, &lt;tt&gt;slowms&lt;/tt&gt;, and &lt;tt&gt;sampleRate&lt;/tt&gt; on success. Like &lt;tt&gt;slowms&lt;/tt&gt;, the &lt;tt&gt;sampleRate&lt;/tt&gt; setting is unchanged when it is omitted from the command. The &lt;tt&gt;sampleRate&lt;/tt&gt; can also be set from the shell using the &lt;tt&gt;db.setProfilingLevel()&lt;/tt&gt; helper:&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;db.setProfilingLevel(2, {slowms: 30, sampleRate: 0.1});&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;The second argument to this helper is now either the slowms value, or an options object.&lt;/p&gt;

&lt;p&gt;The second way to set &lt;tt&gt;sampleRate&lt;/tt&gt; is the new &lt;tt&gt;slowOpSampleRate&lt;/tt&gt; command line option:&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;./mongod --profile 2 --slowms 30 --slowOpSampleRate 0.1&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;Third, it can be set in a configuration file using &lt;tt&gt;operationProfiling.slowOpSampleRate&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="29214">SERVER-4786</key>
            <summary>Random sampling for profiling and logging</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>profiling</label>
                    </labels>
                <created>Thu, 26 Jan 2012 19:07:57 +0000</created>
                <updated>Tue, 15 May 2018 02:07:37 +0000</updated>
                            <resolved>Fri, 27 Jan 2017 00:12:39 +0000</resolved>
                                                    <fixVersion>3.5.3</fixVersion>
                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1486423" author="xgen-internal-githook" created="Fri, 27 Jan 2017 00:04:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;evan-stripe&apos;, u&apos;name&apos;: u&apos;Evan Broder&apos;, u&apos;email&apos;: u&apos;evan@stripe.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4786&quot; title=&quot;Random sampling for profiling and logging&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4786&quot;&gt;&lt;del&gt;SERVER-4786&lt;/del&gt;&lt;/a&gt; Allow specifying sample rate of slow queries&lt;/p&gt;

&lt;p&gt;Adds a sampleRate parameter to the profile command, a value&lt;br/&gt;
on the interval &lt;span class=&quot;error&quot;&gt;&amp;#91;0, 1&amp;#93;&lt;/span&gt; which indicates which fraction of&lt;br/&gt;
operations should be randomly sampled for profiling and&lt;br/&gt;
logging. This allows users to reduce their slowms threshold&lt;br/&gt;
or increase their profiling level with less performance&lt;br/&gt;
impact on the system.&lt;/p&gt;

&lt;p&gt;Closes #1099&lt;/p&gt;

&lt;p&gt;Signed-off-by: David Storch &amp;lt;david.storch@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/94b37aac060bcc8b10c3eb41f178d84008136f9c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/94b37aac060bcc8b10c3eb41f178d84008136f9c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="624595" author="richard@10gen.com" created="Tue, 17 Jun 2014 15:05:26 +0000"  >&lt;p&gt;If this is to be done, it would be good for the sampling frequency to be tunable. Spitball proposal: when the profiling level is 3, allow the user to submit a double float, with 1.0 meaning &quot;profile everything&quot; and 0.0 meaning profile nothing. A sampling frequency of 1/500 would thus be equivalent to:&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;db.runCommand( { profile : 3 , frequency : 0.002 } );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
</comment>
                    </comments>
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