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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-28091] Disk stats collection on OS X only captures I/O utilization averaged over the uptime of the machine</title>
                <link>https://jira.mongodb.org/browse/SERVER-28091</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.3/etc/evergreen.yml#L263-L271&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The &quot;run diskstats&quot; function&lt;/a&gt; invokes &lt;tt&gt;iostat&lt;/tt&gt; with only the &lt;tt&gt;&amp;#45;d&lt;/tt&gt; option, which causes &lt;tt&gt;iostat&lt;/tt&gt; to only show the I/O utilization averaged over the uptime of the machine. The &lt;tt&gt;&amp;#45;w&lt;/tt&gt; option must be used in order to get the I/O utilization averaged over the specified period. We&apos;ll likely want to change the script to run &lt;tt&gt;iostat -d -w 5&lt;/tt&gt; and add some logic to suppress the I/O utilization averaged over the uptime of the machine.&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;
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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;  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;# OSX: Simulate the iostat timestamp.&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;elif iostat -d &amp;gt; /dev/null 2&amp;gt;&amp;amp;1; then&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;    while [ 1 ]&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;    do&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 +&apos;%m/%d/%Y %I:%M:%S %p&apos; &amp;gt;&amp;gt; mongo-diskstats&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;        iostat -d &amp;gt;&amp;gt; mongo-diskstats&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;        printf &quot;\n&quot; &amp;gt;&amp;gt; mongo-diskstats&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;        sleep 5&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;    done&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;p/&gt;

&lt;hr /&gt;

&lt;blockquote&gt;
&lt;p&gt;The first statistics that are printed are averaged over the system uptime. To get information about the current activity, a suitable wait time should be specified, so that the subsequent sets of printed statistics will be averaged over that time.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man8/iostat.8.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man8/iostat.8.html&lt;/a&gt;&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="356864">SERVER-28091</key>
            <summary>Disk stats collection on OS X only captures I/O utilization averaged over the uptime of the machine</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="jonathan.abrahams">Jonathan Abrahams</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Feb 2017 05:14:39 +0000</created>
                <updated>Fri, 14 Apr 2017 00:43:13 +0000</updated>
                            <resolved>Wed, 8 Mar 2017 19:10:03 +0000</resolved>
                                                    <fixVersion>3.4.4</fixVersion>
                    <fixVersion>3.5.5</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1548073" author="xgen-internal-githook" created="Thu, 13 Apr 2017 13:11:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hptabster&apos;, u&apos;name&apos;: u&apos;Jonathan Abrahams&apos;, u&apos;email&apos;: u&apos;jonathan@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28091&quot; title=&quot;Disk stats collection on OS X only captures I/O utilization averaged over the uptime of the machine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28091&quot;&gt;&lt;del&gt;SERVER-28091&lt;/del&gt;&lt;/a&gt; Disk stats collection on OS X only captures I/O utilization averaged over the uptime of the machine&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ca672940f81c3ea82a935aaa87def6101ff5ac62)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/02d0399d1dc531858d525ee718b5e86046974e53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/02d0399d1dc531858d525ee718b5e86046974e53&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1519247" author="xgen-internal-githook" created="Wed, 8 Mar 2017 19:09:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hptabster&apos;, u&apos;name&apos;: u&apos;Jonathan Abrahams&apos;, u&apos;email&apos;: u&apos;jonathan@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28091&quot; title=&quot;Disk stats collection on OS X only captures I/O utilization averaged over the uptime of the machine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28091&quot;&gt;&lt;del&gt;SERVER-28091&lt;/del&gt;&lt;/a&gt; Disk stats collection on OS X only captures I/O utilization averaged over the uptime of the machine&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca672940f81c3ea82a935aaa87def6101ff5ac62&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca672940f81c3ea82a935aaa87def6101ff5ac62&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1518896" author="jonathan.abrahams" created="Wed, 8 Mar 2017 15:13:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; Per &lt;a href=&quot;http://linuxcommand.org/man_pages/iostat1.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Linux iostat man page&lt;/a&gt;: &lt;blockquote&gt;&lt;p&gt;The first report generated by the iostat command provides statistics concerning the time since the system was booted. Each subsequent report covers  the time since the previous report.&lt;/p&gt;&lt;/blockquote&gt; This will be the same problem for the other platforms as well. I suggest we do no special logic to suppress the first report returned.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="335284">SERVER-27234</issuekey>
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