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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-1746] Perf: count() inconsistent response times</title>
                <link>https://jira.mongodb.org/browse/SERVER-1746</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Problem:&lt;br/&gt;
Depending on moderate load (see attach munin report), I&apos;m seeing inconsistent time for count()&lt;/p&gt;

&lt;p&gt;Mon Sep  6 15:45:33&lt;br/&gt;
&amp;gt; db.blogs.count()            &lt;br/&gt;
169096641&lt;br/&gt;
Mon Sep  6 15:54:22&lt;/p&gt;

&lt;p&gt;Mon Sep  6 19:06:20&lt;br/&gt;
&amp;gt; db.blogs.count()&lt;br/&gt;
170166577&lt;br/&gt;
Mon Sep  6 19:06:29&lt;/p&gt;

&lt;p&gt;The second clocks in a 9 seconds (when there is no load on the system), the first at 9 minutes with a system under moderate load.&lt;/p&gt;

&lt;p&gt;I&apos;m guessing that the count is a computed value rather than stored. If we use a stored value in future, then insert and delete operations will be gated by the latch time for the counter, so its a trade off.&lt;/p&gt;

&lt;p&gt;Environment:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;3 shard cluster, 2 members per shard, plus a config and router node (all separate machines)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Reproduce:&lt;br/&gt;
See steps above&lt;/p&gt;

&lt;p&gt;Business Case:&lt;br/&gt;
Scalability&lt;/p&gt;</description>
                <environment>EC2</environment>
        <key id="13023">SERVER-1746</key>
            <summary>Perf: count() inconsistent response times</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="4">Incomplete</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="alvin">Alvin Richards</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Sep 2010 02:21:13 +0000</created>
                <updated>Sat, 3 Sep 2011 05:30:13 +0000</updated>
                            <resolved>Sat, 3 Sep 2011 05:30:12 +0000</resolved>
                                    <version>1.6.2</version>
                                                    <component>Performance</component>
                                        <votes>2</votes>
                                    <watches>2</watches>
                                                                                                                        <attachments>
                            <attachment id="10430" name="Munin.pdf" size="6290287" author="alvin" created="Tue, 7 Sep 2010 02:21:13 +0000"/>
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