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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-18375] High CPU during insert-only stress test due to heap contention on Windows</title>
                <link>https://jira.mongodb.org/browse/SERVER-18375</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Configuration:&lt;br/&gt;
2-node replica set w/ TCMalloc fix for WT heap (3.1.3-pre-)&lt;/p&gt;

&lt;p&gt;Problem:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;High CPU during insert only stress after a day,&lt;br/&gt;
profiler indicated high cpu usage around the heap functions&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I think it&apos;s early in the 3.2 cycle that we can implement a full solution and stabilize it.&lt;/p&gt;

&lt;p&gt;This happened b/c we implemented the TCMalloc 1/2 way (only for WT) so the heap contention is still around , see profiler information about the % of the time around new/free functions&lt;/p&gt;</description>
                <environment></environment>
        <key id="202817">SERVER-18375</key>
            <summary>High CPU during insert-only stress test due to heap contention on Windows</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-platform">DO NOT USE - Backlog - Platform Team</assignee>
                                    <reporter username="eitan.klein">Eitan Klein</reporter>
                        <labels>
                            <label>32qa</label>
                            <label>WTmem</label>
                            <label>move-sa</label>
                    </labels>
                <created>Thu, 7 May 2015 19:08:12 +0000</created>
                <updated>Thu, 9 Apr 2020 02:23:13 +0000</updated>
                                                            <fixVersion>Needs Further Definition</fixVersion>
                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="1389946" author="alessandro.gherardi@yahoo.com" created="Wed, 21 Sep 2016 16:33:28 +0000"  >&lt;p&gt;Related ticket has been closed. This issue is 1 year+ old. Can it be resolved?&lt;/p&gt;</comment>
                            <comment id="1118310" author="alessandro.gherardi@yahoo.com" created="Fri, 18 Dec 2015 17:20:23 +0000"  >&lt;p&gt;Is this still an issue in 3.2.0/3.2.1?&lt;/p&gt;</comment>
                            <comment id="916252" author="eitan.klein" created="Mon, 18 May 2015 01:10:32 +0000"  >&lt;p&gt;50% of CPU time on WT secondary has been spent on free memory (See profile output on the attached file)&lt;/p&gt;

&lt;p&gt;Repro:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Configure WT on primary&lt;/li&gt;
	&lt;li&gt;Configure WT on secondary windows machines (you will observe high CPU as results of heap contention)&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="907969" author="eitan.klein" created="Thu, 7 May 2015 19:09:14 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18079&quot; title=&quot;Large performance drop with documents &amp;gt; 16k on Windows&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18079&quot;&gt;&lt;del&gt;SERVER-18079&lt;/del&gt;&lt;/a&gt; option 2 and 3 that we didn&apos;t implemented.&lt;/p&gt;</comment>
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                <attachments>
                            <attachment id="73366" name="TCmalloc2.5.png" size="610455" author="eitan.klein" created="Thu, 7 May 2015 19:08:12 +0000"/>
                            <attachment id="73367" name="TCmalloc3.5.png" size="680648" author="eitan.klein" created="Thu, 7 May 2015 19:08:12 +0000"/>
                            <attachment id="74652" name="WT-Secondery.png" size="148200" author="eitan.klein" created="Mon, 18 May 2015 01:10:32 +0000"/>
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