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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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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            <title>[SERVER-6437] ERROR:   mmap() failed for ...   len: .... errno:12 Cannot allocate memory when inserting millions of record</title>
                <link>https://jira.mongodb.org/browse/SERVER-6437</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When making massive inserts it reaches a point where the server rejects new inserts with the following error in the logs:&lt;/p&gt;

&lt;p&gt;ERROR:   mmap() failed for ...  &lt;br/&gt;
len: .... errno:12 Cannot allocate memory &lt;/p&gt;

&lt;p&gt;We have tested making it in PHP and Python, and the problem is the same in both.&lt;/p&gt;

&lt;p&gt;The attachment is a simple script in PHP which causes the error&lt;/p&gt;

&lt;p&gt;We have apparently solver it telling the kernel not to limit the memory size of the MongoDB project with the command&lt;/p&gt;

&lt;p&gt;sysctl -v unlimited&lt;/p&gt;</description>
                <environment>Operating System:  Suse Linux Enterprise Server 10 (Virtual Server on Xen)&lt;br/&gt;
RAM:  10 Gb and 5 Gb&lt;br/&gt;
Cores: 32 (AMD) and 16 (AMD)</environment>
        <key id="44108">SERVER-6437</key>
            <summary>ERROR:   mmap() failed for ...   len: .... errno:12 Cannot allocate memory when inserting millions of record</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="-1">Unassigned</assignee>
                                    <reporter username="ciges">Jos&#233; Manuel Ciges Regueiro</reporter>
                        <labels>
                            <label>memory</label>
                            <label>mmap</label>
                    </labels>
                <created>Fri, 13 Jul 2012 09:26:25 +0000</created>
                <updated>Wed, 15 Aug 2012 14:24:14 +0000</updated>
                            <resolved>Fri, 13 Jul 2012 19:48:42 +0000</resolved>
                                    <version>2.0.4</version>
                    <version>2.0.6</version>
                                                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="143113" author="ciges" created="Mon, 16 Jul 2012 08:57:02 +0000"  >&lt;p&gt;Thanks, Andy for your answer.&lt;/p&gt;

&lt;p&gt;Do you know if the solution adopted by us, setting ulimit -v unlimited for the session which starts the server, is OK?&lt;/p&gt;

&lt;p&gt;The command is &lt;b&gt;ulimit -v unlimited&lt;/b&gt; (and no sysctl, as I have told by error in the issue description)&lt;/p&gt;
</comment>
                            <comment id="142885" author="schwerin" created="Fri, 13 Jul 2012 19:48:42 +0000"  >&lt;p&gt;By design, mongod processes map all database data files into their address space, and so will consume a large amount of virtual memory.  This does not necessarily correspond to a large physical RAM footprint, as only recently and frequently accessed data need to be kept in physical memory.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="18154" name="breaks_Mongo.php" size="615" author="ciges" created="Fri, 13 Jul 2012 09:26:25 +0000"/>
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