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    <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-21305] Lock &apos;timeAcquiringMicros&apos; value is much higher than the actual time spent</title>
                <link>https://jira.mongodb.org/browse/SERVER-21305</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is present both in 3.0 and in 3.2 (master), but not in 2.6 or earlier.&lt;/p&gt;

&lt;p&gt;For each wait which is more than a second, MongoDB will report the sum of arithmetic progression of all 500 msec increments of the wait, so basically we report approximately a square of the actual wait time.&lt;/p&gt;

&lt;p&gt;It happens on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/concurrency/lock_state.cpp#L685&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt;. For lock waits, we wake up every 500 milliseconds to check for deadlock and to also update the wait time counters so that if a thread is blocked for a long time, the currentOp statistics will reflect that. The bug is in that we do not reset the last sample timestamp and so the time keeps accumulating.&lt;/p&gt;

&lt;p&gt;The workaround until we fix it would be to take the square root of the wait time reported in the lock info.&lt;/p&gt;</description>
                <environment></environment>
        <key id="237936">SERVER-21305</key>
            <summary>Lock &apos;timeAcquiringMicros&apos; value is much higher than the actual time spent</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Nov 2015 16:11:10 +0000</created>
                <updated>Fri, 22 Apr 2016 06:06:01 +0000</updated>
                            <resolved>Mon, 9 Nov 2015 21:09:07 +0000</resolved>
                                    <version>3.0.7</version>
                    <version>3.2.0-rc2</version>
                                    <fixVersion>3.0.8</fixVersion>
                    <fixVersion>3.2.0-rc3</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1083764" author="xgen-internal-githook" created="Mon, 9 Nov 2015 21:42:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21305&quot; title=&quot;Lock &amp;#39;timeAcquiringMicros&amp;#39; value is much higher than the actual time spent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21305&quot;&gt;&lt;del&gt;SERVER-21305&lt;/del&gt;&lt;/a&gt;: Correctly calculate lock acquisition time for long waits&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ba231028314553f1495e6583d5a59c55919a764c)&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/52d45c750df0d10634c9939d75b68a260815c78e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/52d45c750df0d10634c9939d75b68a260815c78e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1083705" author="xgen-internal-githook" created="Mon, 9 Nov 2015 21:08:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21305&quot; title=&quot;Lock &amp;#39;timeAcquiringMicros&amp;#39; value is much higher than the actual time spent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21305&quot;&gt;&lt;del&gt;SERVER-21305&lt;/del&gt;&lt;/a&gt;: Correctly calculate lock acquisition time for long waits&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ba231028314553f1495e6583d5a59c55919a764c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ba231028314553f1495e6583d5a59c55919a764c&lt;/a&gt;&lt;/p&gt;</comment>
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