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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-53185] Log more information when cpuNanos metrics is zero</title>
                <link>https://jira.mongodb.org/browse/SERVER-53185</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://github.com/mongodb/mongo/blob/208b03fa0b60f4c4d9a3a13630b64a1f0e0aab7a/jstests/noPassthrough/profile_operation_metrics.js#L41&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this test&lt;/a&gt;, &apos;cpuNanos&apos; occasionally returns &apos;0&apos; instead of a positive integer.&lt;/p&gt;

&lt;p&gt;I believe this may happen if the OS migrates a thread to a different CPU, which could lead to bogus results, per the man page:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;The CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID clocks are realized on many platforms using timers from the CPUs (TSC on i386, AR.ITC on Itanium). These registers may differ between CPUs and as a consequence these clocks may return bogus results if a process is migrated to another CPU.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;The test failures have always resulted in values of exactly 0 elapsed time (never negative) which suggests something else could be going on as well.&lt;/p&gt;

&lt;p&gt;Print more diagnostic information when operations return 0 cpuNanos.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1557369">SERVER-53185</key>
            <summary>Log more information when cpuNanos metrics is zero</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Dec 2020 18:20:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:50 +0000</updated>
                            <resolved>Tue, 15 Dec 2020 17:03:00 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3530445" author="xgen-internal-githook" created="Tue, 15 Dec 2020 16:12:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53185&quot; title=&quot;Log more information when cpuNanos metrics is zero&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53185&quot;&gt;&lt;del&gt;SERVER-53185&lt;/del&gt;&lt;/a&gt; log more information when cpuNanos is zero&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3b7d696a9bc98c24f5b64ff9476681f75e605753&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3b7d696a9bc98c24f5b64ff9476681f75e605753&lt;/a&gt;&lt;/p&gt;</comment>
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