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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-6507] mongostat lock% reports a number higher than (100% times number of cores)</title>
                <link>https://jira.mongodb.org/browse/SERVER-6507</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;From a user with an 8 core machine:&lt;/p&gt;

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

&lt;p&gt;What is this stat measuring?&lt;/p&gt;</description>
                <environment></environment>
        <key id="44711">SERVER-6507</key>
            <summary>mongostat lock% reports a number higher than (100% times number of cores)</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Jul 2012 18:15:32 +0000</created>
                <updated>Mon, 11 Jul 2016 17:58:06 +0000</updated>
                            <resolved>Thu, 2 Aug 2012 19:02:30 +0000</resolved>
                                    <version>2.2.0-rc0</version>
                                    <fixVersion>2.2.0-rc1</fixVersion>
                                    <component>Tools</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="149986" author="auto" created="Thu, 2 Aug 2012 19:08:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-02T12:02:56-07:00&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6507&quot; title=&quot;mongostat lock% reports a number higher than (100% times number of cores)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6507&quot;&gt;&lt;del&gt;SERVER-6507&lt;/del&gt;&lt;/a&gt; - lock reporting fixing&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;don&apos;t double count recursive&lt;/li&gt;
	&lt;li&gt;record time before unlocking so we don&apos;t get deschduled&lt;/li&gt;
	&lt;li&gt;fix w-&amp;gt;X reporting&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1bada0e7d8225a5a6327a4a9ab2158df18754ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1bada0e7d8225a5a6327a4a9ab2158df18754ce&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="148324" author="dwight_10gen" created="Fri, 27 Jul 2012 21:30:15 +0000"  >&lt;p&gt;investigating.&lt;br/&gt;
aside: not sure &quot;# of cores&quot; necessarily matters the # of threads inside a read lock could be higher than that for a few reasons?&quot; if about # of connecitons, that sounds wrong.&lt;/p&gt;
</comment>
                            <comment id="148305" author="ian@10gen.com" created="Fri, 27 Jul 2012 20:46:54 +0000"  >&lt;p&gt;&lt;a href=&quot;http://codereview.10gen.com/8186055/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://codereview.10gen.com/8186055/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="147721" author="milkie" created="Thu, 26 Jul 2012 18:34:13 +0000"  >&lt;p&gt;Dwight&apos;s working on this.&lt;/p&gt;</comment>
                            <comment id="147186" author="milkie" created="Wed, 25 Jul 2012 16:25:09 +0000"  >&lt;p&gt;I found a minor bug when recording time during the exclusive lock phase of journal commit.  Also, recursive locks might be counting double and I&apos;ll fix that as well.&lt;br/&gt;
But the biggest problem turned out to be that the thread scheduler was defeating our attempts to record lock time.  We are stopping the lock time stopwatch &lt;b&gt;after&lt;/b&gt; we unlock the qlock mutex. Since we signal condvars as part of qlock unlock(), it is possible that you can get a chain of lock/unlocks for a given DB lock, without any of their lock times being recorded until after they are &lt;b&gt;all&lt;/b&gt; done. Thus all the threads are overlapping their lock times.&lt;br/&gt;
Dwight is looking into changing this behavior so that we stop the lock time stopwatch within the qlock mutex.&lt;/p&gt;</comment>
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