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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-16593] mongod memory usage much larger than cache_size for wiredtiger b-tree</title>
                <link>https://jira.mongodb.org/browse/SERVER-16593</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Memory usage by mongod is much larger than the cache_size setting for the WT b-tree. This is also a problem for the WT LSM. When using cache_size=8G and then running iibench I see that mongod vsz and rss are larger than 60G for the WT b-tree:&lt;br/&gt;
root      1919  111 44.3 66988456 65824412 ?   Sl   Dec17 1378:17 bin.tcm/mongod --config /data/mysql/mongo.28/mongo.conf --storageEngine wiredTiger --wiredTigerEngineConfig=cache_size=8G,direct_io=&lt;span class=&quot;error&quot;&gt;&amp;#91;data&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;And larger than 30G for the WT LSM:&lt;br/&gt;
root     20861  225 22.0 40058892 32678208 ?   Sl   Dec17 2783:38 bin.tcm/mongod --config /data/mysql/mongo.28/mongo.conf --storageEngine wiredTiger --wiredTigerEngineConfig=cache_size=8G,direct_io=&lt;span class=&quot;error&quot;&gt;&amp;#91;data&amp;#93;&lt;/span&gt; --wiredTigerIndexConfig=type=lsm&lt;/p&gt;

&lt;p&gt;From /proc/$pid/smaps for the WT b-tree there is one huge allocation for the heap:&lt;br/&gt;
02c10000-febde6000 rw-p 00000000 00:00 0                                 &lt;span class=&quot;error&quot;&gt;&amp;#91;heap&amp;#93;&lt;/span&gt;&lt;br/&gt;
Size:           66733912 kB&lt;br/&gt;
Rss:            65805752 kB&lt;br/&gt;
Pss:            65805752 kB&lt;br/&gt;
Shared_Clean:          0 kB&lt;br/&gt;
Shared_Dirty:          0 kB&lt;br/&gt;
Private_Clean:         0 kB&lt;br/&gt;
Private_Dirty:  65805752 kB&lt;br/&gt;
Referenced:     65805752 kB&lt;br/&gt;
Anonymous:      65805752 kB&lt;br/&gt;
AnonHugePages:         0 kB&lt;br/&gt;
Swap:                  0 kB&lt;br/&gt;
KernelPageSize:        4 kB&lt;br/&gt;
MMUPageSize:           4 kB&lt;br/&gt;
Locked:                0 kB&lt;/p&gt;

&lt;p&gt;And for the WT LSM the heap allocation isn&apos;t as huge (less than 8G):&lt;/p&gt;

&lt;p&gt;02c10000-1c46fe000 rw-p 00000000 00:00 0                                 &lt;span class=&quot;error&quot;&gt;&amp;#91;heap&amp;#93;&lt;/span&gt;&lt;br/&gt;
Size:            7367608 kB&lt;br/&gt;
Rss:             5496284 kB&lt;br/&gt;
Pss:             5496284 kB&lt;br/&gt;
Shared_Clean:          0 kB&lt;br/&gt;
Shared_Dirty:          0 kB&lt;br/&gt;
Private_Clean:         0 kB&lt;br/&gt;
Private_Dirty:   5496284 kB&lt;br/&gt;
Referenced:      5496284 kB&lt;br/&gt;
Anonymous:       5496284 kB&lt;br/&gt;
AnonHugePages:         0 kB&lt;br/&gt;
Swap:                  0 kB&lt;br/&gt;
KernelPageSize:        4 kB&lt;br/&gt;
MMUPageSize:           4 kB&lt;br/&gt;
Locked:                0 kB&lt;/p&gt;
</description>
                <environment></environment>
        <key id="175342">SERVER-16593</key>
            <summary>mongod memory usage much larger than cache_size for wiredtiger b-tree</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="3">Duplicate</resolution>
                                        <assignee username="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="mdcallag">Mark Callaghan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Dec 2014 18:29:21 +0000</created>
                <updated>Sat, 24 Jan 2015 17:18:23 +0000</updated>
                            <resolved>Wed, 31 Dec 2014 04:33:04 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="794565" author="mdcallag" created="Mon, 29 Dec 2014 15:02:28 +0000"  >&lt;p&gt;yes&lt;/p&gt;</comment>
                            <comment id="794452" author="michael.cahill" created="Mon, 29 Dec 2014 05:59:17 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mdcallag&quot; class=&quot;user-hover&quot; rel=&quot;mdcallag&quot;&gt;mdcallag&lt;/a&gt;, I&apos;d like to close this one as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16546&quot; title=&quot;Mongod memory grows until killed with wiredTiger repl set with small oplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16546&quot;&gt;&lt;del&gt;SERVER-16546&lt;/del&gt;&lt;/a&gt;.  Is that okay with you?&lt;/p&gt;</comment>
                            <comment id="790547" author="michael.cahill" created="Fri, 19 Dec 2014 02:36:48 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mdcallag&quot; class=&quot;user-hover&quot; rel=&quot;mdcallag&quot;&gt;mdcallag&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;This looks like a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16546&quot; title=&quot;Mongod memory grows until killed with wiredTiger repl set with small oplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16546&quot;&gt;&lt;del&gt;SERVER-16546&lt;/del&gt;&lt;/a&gt;, which will be fixed in RC4.  A WiredTiger bug meant we weren&apos;t freeing some data that was cached during page splits.  It is fixed by &lt;a href=&quot;https://github.com/wiredtiger/wiredtiger/pull/1496&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/wiredtiger/wiredtiger/pull/1496&lt;/a&gt;, which will be merged into MongoDB&apos;s master soon.&lt;/p&gt;

&lt;p&gt;Michael.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="174495">SERVER-16546</issuekey>
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                            <customfieldvalue>&lt;p&gt;Start WT b-tree via:&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;mongod --config /data/mysql/mongo.28/mongo.conf --storageEngine wiredTiger --wiredTigerEngineConfig=&quot;cache_size=8G,direct_io=[data]&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;With WT LSM this does not reproduce:&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;mongod --config /data/mysql/mongo.28/mongo.conf --storageEngine wiredTiger --wiredTigerEngineConfig=&quot;cache_size=8G,direct_io=[data]&quot; --wiredTigerIndexConfig=&quot;type=lsm&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;mongo.conf is:&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;   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;processManagement:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;  fork: true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;systemLog:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;  destination: file&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;  path: /data/mysql/mongo.28/log&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;  logAppend: true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;storage:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;  dbPath: /data/mysql/mongo.28/data&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;  journal:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    enabled: true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;  mmapv1:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    syncPeriodSecs: 60&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;    journal:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;      commitIntervalMs: 100&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The test client is iibench with 10 concurrent load threads as explained in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16575&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-16575&lt;/a&gt;&lt;/p&gt;</customfieldvalue>

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