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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-24207] Substantial excess allocated memory and stall in YCSB insert workload associated with very large page</title>
                <link>https://jira.mongodb.org/browse/SERVER-24207</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;64 GB memory, 24 cpus (12 cores)&lt;/li&gt;
	&lt;li&gt;mongod 3.3.5, standalone, 45 GB cache&lt;/li&gt;
	&lt;li&gt;YCSB workload as follows (in file repro.ycsb):
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;                                
&lt;p&gt;run as follows:&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;ycsb load mongodb -s -P repro.ycsb -threads 30 -p batchsize=1000&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Some key metrics from a run:&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/122429/122429_ycsb-insert-stall-excess-memory.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;stall from A-B immediately followed by
	&lt;ul&gt;
		&lt;li&gt;large jump in pages held in cache&lt;/li&gt;
		&lt;li&gt;very large maximum page size at eviction (about 10 GB)&lt;/li&gt;
		&lt;li&gt;immediate large jump in excess allocated memory of about the same size (11 GB)&lt;/li&gt;
		&lt;li&gt;excess immediately begins to decline&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;other stalls, e.g. C-D, appear to be associated with cache exceeding configured maximum (49 GB in cache vs 46 GB configured)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="287805">SERVER-24207</key>
            <summary>Substantial excess allocated memory and stall in YCSB insert workload associated with very large page</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="9">Done</resolution>
                                        <assignee username="sulabh.mahajan@mongodb.com">Sulabh Mahajan</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>RF</label>
                            <label>WTmem</label>
                    </labels>
                <created>Thu, 19 May 2016 13:47:28 +0000</created>
                <updated>Fri, 15 Jul 2016 13:38:26 +0000</updated>
                            <resolved>Fri, 15 Jul 2016 05:36:26 +0000</resolved>
                                    <version>3.3.5</version>
                    <version>3.3.6</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1324893" author="sulabh.mahajan" created="Fri, 15 Jul 2016 05:36:26 +0000"  >&lt;p&gt;This issue can&apos;t be reproduced after the fix for &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2026&quot; title=&quot;Maximum pages size at eviction too large&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2026&quot;&gt;&lt;del&gt;WT-2026&lt;/del&gt;&lt;/a&gt;. So I am marking it as gone away.&lt;/p&gt;</comment>
                            <comment id="1324884" author="sulabh.mahajan" created="Fri, 15 Jul 2016 05:12:15 +0000"  >&lt;p&gt;I don&apos;t see this problem with the latest wiredtiger/develop.&lt;br/&gt;
YCSB run attached has no stalls, and max page size at eviction is as expected.&lt;/p&gt;</comment>
                            <comment id="1322150" author="alexander.gorrod" created="Wed, 13 Jul 2016 01:21:58 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sulabh.mahajan&quot; class=&quot;user-hover&quot; rel=&quot;sulabh.mahajan&quot;&gt;sulabh.mahajan&lt;/a&gt; I believe this is fixed by the change in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2026&quot; title=&quot;Maximum pages size at eviction too large&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2026&quot;&gt;&lt;del&gt;WT-2026&lt;/del&gt;&lt;/a&gt;, could you test the configuration in this ticket to confirm? &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="284926">SERVER-24076</issuekey>
        </issuelink>
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                <attachments>
                            <attachment id="130835" name="timeseries_op_after_fix.html" size="5347040" author="sulabh.mahajan@mongodb.com" created="Fri, 15 Jul 2016 05:12:15 +0000"/>
                            <attachment id="122429" name="ycsb-insert-stall-excess-memory.png" size="230890" author="bruce.lucas@mongodb.com" created="Thu, 19 May 2016 13:47:28 +0000"/>
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