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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-47897] CurOp should use monotonic clock source for duration measurements</title>
                <link>https://jira.mongodb.org/browse/SERVER-47897</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In several spots, curOp uses &lt;a href=&quot;https://github.com/mongodb/mongo/blob/726c65f4857fdad05075de8277c7d4a7fef92b70/src/mongo/db/curop.cpp#L411&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;curTimeMicros64&lt;/a&gt; which delegates to gettimeofday()  on linux. This is not guaranteed to be monotonically increasing and can lead to incorrect reporting for metrics. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1336389">SERVER-47897</key>
            <summary>CurOp should use monotonic clock source for duration measurements</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="13201">Fixed</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>greenerbuild</label>
                            <label>qopt-team</label>
                    </labels>
                <created>Fri, 1 May 2020 20:25:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:46 +0000</updated>
                            <resolved>Thu, 11 Jun 2020 12:37:51 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3204067" author="xgen-internal-githook" created="Wed, 10 Jun 2020 21:20:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;James Wahlin&apos;, &apos;email&apos;: &apos;james@mongodb.com&apos;, &apos;username&apos;: &apos;jameswahlin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47897&quot; title=&quot;CurOp should use monotonic clock source for duration measurements&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47897&quot;&gt;&lt;del&gt;SERVER-47897&lt;/del&gt;&lt;/a&gt; CurOp should use monotonic clock source for duration measurements&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/af0d84cb6eaab138cae7ed690ca84b32a21eee6c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/af0d84cb6eaab138cae7ed690ca84b32a21eee6c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3077980" author="james.wahlin@10gen.com" created="Mon, 11 May 2020 13:26:27 +0000"  >&lt;p&gt;As part of this work, we should consider adding back &lt;a href=&quot;https://github.com/mongodb/mongo/blob/087d6aeaaa10f401b22fa8c39be427150804aa2c/src/mongo/db/curop.h#L559&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this invariant&lt;/a&gt;&#160;which will be removed under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48078&quot; title=&quot;Remove OpDebug invariant that relies on monotonic clock source &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48078&quot;&gt;&lt;del&gt;SERVER-48078&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="3076638" author="james.wahlin@10gen.com" created="Fri, 8 May 2020 21:07:58 +0000"  >&lt;p&gt;Using SystemTickSource appears to be the right solution for duration measurement. It uses a monotonic clock to record points in time and is unaffected by NTP time adjustments so safer for comparison. It can provide the microsecond granularity that the current curTimeMicros64() call provides.&lt;/p&gt;</comment>
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            <issuekey id="1346290">SERVER-48078</issuekey>
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