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<item>
            <title>[SERVER-20217] Allow reporting of page faults and context switches during slow queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-20217</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Directly keep track of the number of page faults and related info. The idea is to get the start values of these counters between operations (under control of a new run-time settable server parameter), and if there is a slow query, we do another read to compute the differences and report those.&lt;br/&gt;
The information would be obtained by using getrusage on Linux, and similar functions for other systems where available.&lt;/p&gt;</description>
                <environment></environment>
        <key id="227772">SERVER-20217</key>
            <summary>Allow reporting of page faults and context switches during slow queries</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Aug 2015 17:20:29 +0000</created>
                <updated>Wed, 5 Apr 2017 16:44:17 +0000</updated>
                            <resolved>Mon, 28 Nov 2016 19:30:24 +0000</resolved>
                                    <version>3.0.6</version>
                    <version>3.1.7</version>
                                                    <component>Concurrency</component>
                                        <votes>1</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1443717" author="mark.benvenuto" created="Mon, 28 Nov 2016 19:30:24 +0000"  >&lt;p&gt;With the work in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24572&quot; title=&quot;Add support for collecting information from /proc/stat&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24572&quot;&gt;&lt;del&gt;SERVER-24572&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24605&quot; title=&quot;Add support for collecting information from /proc/meminfo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24605&quot;&gt;&lt;del&gt;SERVER-24605&lt;/del&gt;&lt;/a&gt;, we log context switches, and page faults to FTDC. Unfortunately, there is no way to correlate the activity to a particular query. The OS only keeps aggregate statistics on a process or system-wide basis. At the best, correlation has be done by hand by examining the FTDC log for the time period in which the query ran with the understanding that FTDC metrics account for process and system-wide.&lt;/p&gt;

&lt;p&gt;I am closing this as by design since we will not output these aggregate statistics in the slow query log output for the reasons I outlined above.&lt;/p&gt;</comment>
                            <comment id="1039706" author="oleg@evergage.com" created="Tue, 22 Sep 2015 14:18:07 +0000"  >&lt;p&gt;Running on 3.0.6 (with a 3.0.7 back port for some spin lock fixes), haven&apos;t tried 3.1.8 or latest dev yet.&lt;/p&gt;</comment>
                            <comment id="1039680" author="martin.bligh" created="Tue, 22 Sep 2015 14:01:34 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=oleg%40evergage.com&quot; class=&quot;user-hover&quot; rel=&quot;oleg@evergage.com&quot;&gt;oleg@evergage.com&lt;/a&gt; are you running on 3.1.8? That should be considerably better for consistent performance than before, we&apos;ve been fixing a variety of issues. &lt;/p&gt;</comment>
                            <comment id="1039064" author="oleg@evergage.com" created="Mon, 21 Sep 2015 22:21:36 +0000"  >&lt;p&gt;Would absolutely love to have more tools to debug slow queries! I&apos;ve been seeing considerably more latency spikes and variability with WiredTiger vs MMAP, so anything to help figure out latency issues is great.&lt;/p&gt;</comment>
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