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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>
    </build-info>


<item>
            <title>[SERVER-16551] tcmalloc ReleaseToCentralCache account &gt; 14% usage with long insert traffic</title>
                <link>https://jira.mongodb.org/browse/SERVER-16551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;during long insert with 64 threads, after about 2500 sec, perf event show tcmalloc&apos;s ReleaseToCentralCache is hot, sampled at 14.59% in the following case&lt;/p&gt;

&lt;p&gt;This test is done with wiredtiger, haven;t check mmapv1 yet. &lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;14.59%    mongod  mongod     [.] tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc::ThreadCache::FreeList*, unsigned long, int)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;it seems we can adjust max thread cache size to alleviate this situation. The default size is 32M per thread, did test with 64M, which seems improve the throughput &lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/59669/59669_thread_cache_64mb_vs_32mb.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;and here is perf even flame graph, you can check usage interactively. (please download and open in a new window for better view)&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/59670/59670_perf-kernel-stable-after-bad3.svg&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;
</description>
                <environment></environment>
        <key id="174611">SERVER-16551</key>
            <summary>tcmalloc ReleaseToCentralCache account &gt; 14% usage with long insert traffic</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="rui.zhang">Rui Zhang</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Mon, 15 Dec 2014 18:08:40 +0000</created>
                <updated>Sat, 24 Jan 2015 17:18:25 +0000</updated>
                            <resolved>Wed, 7 Jan 2015 20:54:45 +0000</resolved>
                                    <version>2.8.0-rc2</version>
                                                    <component>Performance</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="803824" author="xgen-internal-githook" created="Tue, 13 Jan 2015 22:40:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16829&quot; title=&quot;Expose tcmalloc runtime configuration options through setParameter mechanism&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16829&quot;&gt;&lt;del&gt;SERVER-16829&lt;/del&gt;&lt;/a&gt; Expose tcmalloc configuration options for per-thread cache size and decommit behavior.&lt;/p&gt;

&lt;p&gt;Also, increases the default cap on the sum of all per-thread cache sizes from&lt;br/&gt;
32MB to 64MB, as advised by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16551&quot; title=&quot;tcmalloc ReleaseToCentralCache account &amp;gt; 14% usage with long insert traffic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16551&quot;&gt;&lt;del&gt;SERVER-16551&lt;/del&gt;&lt;/a&gt;.  Should improve behavior of&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16517&quot; title=&quot;Secondary on 2.8.0rc2 cannot keep up (insert-heavy, mmapv1) (mms-prod-queues)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16517&quot;&gt;&lt;del&gt;SERVER-16517&lt;/del&gt;&lt;/a&gt;, as well.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a6ca16f211fe01d2870593d9ab9bfaaa88097a14&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a6ca16f211fe01d2870593d9ab9bfaaa88097a14&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="799483" author="geert.bosch" created="Wed, 7 Jan 2015 20:54:10 +0000"  >&lt;p&gt;In the end, this is not performance-critical here, because the bottle-neck is in the journaling: less time in malloc would just mean more time in yield. As we&apos;re not going to change tcmalloc, I&apos;m closing this.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="174132">SERVER-16517</issuekey>
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