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<item>
            <title>[SERVER-32351] The task-specific totalTimeSpentExecutingMetrics should not count time they are not actually running due to recursion</title>
                <link>https://jira.mongodb.org/browse/SERVER-32351</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/173529/173529_example.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;The above chart presents some overall and some task-specific serviceExecutorTaskStats.metricsByTask.* execution time metrics introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30567&quot; title=&quot;Break out serviceExecutorTaskStats by task type&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30567&quot;&gt;&lt;del&gt;SERVER-30567&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&quot;tasks total currently executing&quot; is the overall number of tasks currently executing, derived from serviceExecutorTaskStats.totalTimeExecutingMicros&lt;/li&gt;
	&lt;li&gt;&quot;tasks source currently executing&quot; is sourceMessage tasks currently executing, derived from serviceExecutorTaskStats.metricsByTask.sourceMessage.totalTimeExecutingMicros&lt;/li&gt;
	&lt;li&gt;&quot;tasks process currently executing&quot; is processMessage tasks currently executing, derived from serviceExecutorTaskStats.metricsByTask.processMessage.totalTimeExecutingMicros&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note that, surprisingly, the sum of the two task-specific execution time metrics is 2x the total execution time metrics, making it appear that there are ~500 total tasks executing at the same time (~250 processMessage tasks and ~250 sourceMessage tasks), even though there are only ~250 threads.&lt;/p&gt;

&lt;p&gt;I believe this is because a sourceMessage task can be called recursively on the same stack as a processMessage task by dispatching the task rather than posting it, but when this happens the timer for the processMessage task continues running even though the task itself is not executing. So if this recursion occurs the time for the recursive sourceMessage task gets added to the time for the outer processMessage task, so that time is double-counted.&lt;/p&gt;

&lt;p&gt;(On the other hand the overall serviceExecutorTaskStats.totalTimeExecutingMicros is correct and it does not double-count time in this way because the timer is only started and stopped based on posted, not dispatched, tasks.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="472504">SERVER-32351</key>
            <summary>The task-specific totalTimeSpentExecutingMetrics should not count time they are not actually running due to recursion</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>SWDI</label>
                    </labels>
                <created>Thu, 14 Dec 2017 19:58:13 +0000</created>
                <updated>Tue, 6 Dec 2022 03:43:47 +0000</updated>
                            <resolved>Mon, 8 Jul 2019 15:20:05 +0000</resolved>
                                                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1852926" author="ben.caimano" created="Mon, 2 Apr 2018 23:24:08 +0000"  >&lt;p&gt;Fyi, from a view inside the code, this looks like it shouldn&apos;t be an issue anymore. I&apos;ll be confirming tomorrow.&lt;/p&gt;</comment>
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