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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <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-16977] Memory increase trend when running hammar.mongo with WT</title>
                <link>https://jira.mongodb.org/browse/SERVER-16977</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running on pre RC6 build from (1/20/2015)&lt;/p&gt;

&lt;p&gt;We investigated the followings:&lt;/p&gt;

&lt;p&gt;1)	We used a private build w/ separated heap for WT, On this investigation VMMAP indicates that majority of memory increase happen inside of WT code.&lt;br/&gt;
2)	We tried to use WT stats, but we failed as the tool doesn&#8217;t seems working / usable for this workload.&lt;br/&gt;
3)     We reduced the WT cache size to 1 GB and observe the execution can pass this threshold.&lt;/p&gt;

&lt;p&gt;Next steps:&lt;/p&gt;

&lt;p&gt;1)	Reduce the amount of load and verify if the memory/resources stabilize (means that evict process is able to keep up 4 threads instead of 90 threads)&lt;br/&gt;
2)	If the above steps will stabilize, we will consider to find way to tune the amount of evict threads in WT   &lt;/p&gt;</description>
                <environment>Topology: 3 replica set &lt;br/&gt;
OS: Windows 2012&lt;br/&gt;
Traffic:&lt;br/&gt;
Hammar.mongo&lt;br/&gt;
&lt;br/&gt;
Command line below:&lt;br/&gt;
-initdb=false &#8211;server ip:port &#8211;profile=INSERT &#8211;totaltime=52000 &#8211;worker=90 &#8211;rps=0&lt;br/&gt;
</environment>
        <key id="180029">SERVER-16977</key>
            <summary>Memory increase trend when running hammar.mongo with WT</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="eitan.klein">Eitan Klein</assignee>
                                    <reporter username="eitan.klein">Eitan Klein</reporter>
                        <labels>
                            <label>28qa</label>
                            <label>wttt</label>
                    </labels>
                <created>Wed, 21 Jan 2015 22:21:08 +0000</created>
                <updated>Sat, 1 Aug 2015 13:30:05 +0000</updated>
                            <resolved>Thu, 30 Jul 2015 20:03:03 +0000</resolved>
                                    <version>2.8.0-rc5</version>
                                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="898741" author="david.daly" created="Mon, 27 Apr 2015 14:42:33 +0000"  >&lt;p&gt;Linking possibly related memory growth tickets. &lt;/p&gt;</comment>
                            <comment id="891372" author="eitan.klein" created="Fri, 17 Apr 2015 12:45:38 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=keith.bostic&quot; class=&quot;user-hover&quot; rel=&quot;keith.bostic&quot;&gt;keith.bostic&lt;/a&gt; Thanks for the update, I will re-run and see if I can spot more data w/ most recent builds. I will update this tickets with more data,.&lt;/p&gt;</comment>
                            <comment id="845851" author="eitan.klein" created="Mon, 9 Mar 2015 00:22:31 +0000"  >&lt;p&gt;See default graph (cache size configured to 1GB memory grew above 2.5 GB).&lt;/p&gt;

&lt;p&gt;The second bitmap cache overhead = 30, memory capped to a level above the cache size but it appear below it used to be (at least it demonstrate bound by upper limit)&lt;/p&gt;</comment>
                            <comment id="824295" author="eitan.klein" created="Sun, 8 Feb 2015 02:32:53 +0000"  >&lt;p&gt;Issue has not been resolved , fresh results from RC8&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.google.com/a/10gen.com/document/d/15NP6DcQPuE3-yTvSKqcsvU77FTndCKCZ6kZmMZKClBI/edit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/a/10gen.com/document/d/15NP6DcQPuE3-yTvSKqcsvU77FTndCKCZ6kZmMZKClBI/edit&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="818649" author="eitan.klein" created="Sun, 1 Feb 2015 03:02:46 +0000"  >&lt;p&gt;Summary&lt;/p&gt;</comment>
                            <comment id="810022" author="eitan.klein" created="Wed, 21 Jan 2015 22:25:11 +0000"  >&lt;p&gt;Summary meeting Keith / Eitan&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                                        </outwardlinks>
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                                        <issuelink>
            <issuekey id="187365">SERVER-17456</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="179198">SERVER-16902</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="179643">SERVER-16941</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="186811">SERVER-17421</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="186885">SERVER-17424</issuekey>
        </issuelink>
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