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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-4089] Memory leak</title>
                <link>https://jira.mongodb.org/browse/SERVER-4089</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have two mongodb shards 29GB each. All data is about 50GB.&lt;br/&gt;
When we restarted our servers appeared the following behaviour:&lt;br/&gt;
res memory on each shard grows very slow (about 1MB/sec), but userd memory (by &quot;free&quot; linux command) grows very fast.&lt;br/&gt;
Now we looks at this situation:&lt;/p&gt;

&lt;p&gt;mongostat:&lt;br/&gt;
insert  query update delete getmore command flushes mapped  vsize    res faults locked % idx miss %     qr|qw   ar|aw  netIn netOut  conn       time &lt;br/&gt;
    15    109      9      2      57      87       0  33.9g  72.2g  1.49g      0      3.1          0       0|0     0|0    39k   329k    81   00:33:51 &lt;/p&gt;

&lt;p&gt;but:&lt;/p&gt;

&lt;p&gt;root@MongoShard1:~# free&lt;br/&gt;
             total       used       free     shared    buffers     cached&lt;br/&gt;
Mem:      29367112   29226476     140636          0      40732   28061776&lt;br/&gt;
-/+ buffers/cache:    1123968   28243144&lt;br/&gt;
Swap:      1048568          0    1048568&lt;/p&gt;

&lt;p&gt;about 29gb used, but by mongo only 1.49gb&lt;br/&gt;
there are no any other processes on server that can use more than some megabytes of ram&lt;/p&gt;

&lt;p&gt;Does it mongodb bug?&lt;/p&gt;</description>
                <environment>Debian Squeeze, mongo installed from official 10gen repo</environment>
        <key id="23722">SERVER-4089</key>
            <summary>Memory leak</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="-1">Unassigned</assignee>
                                    <reporter username="vitalybaev">Vitaly Baev</reporter>
                        <labels>
                            <label>leak</label>
                            <label>memory</label>
                    </labels>
                <created>Mon, 17 Oct 2011 20:36:43 +0000</created>
                <updated>Mon, 17 Oct 2011 21:42:54 +0000</updated>
                            <resolved>Mon, 17 Oct 2011 21:21:13 +0000</resolved>
                                    <version>2.0.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="60993" author="eliot" created="Mon, 17 Oct 2011 21:42:54 +0000"  >&lt;p&gt;Looks like in cache - so file system cache probably.&lt;/p&gt;</comment>
                            <comment id="60987" author="vitalybaev" created="Mon, 17 Oct 2011 21:34:42 +0000"  >&lt;p&gt;So who exactly uses 28gb memory? Mongo?&lt;/p&gt;</comment>
                            <comment id="60978" author="eliot" created="Mon, 17 Oct 2011 21:21:07 +0000"  >&lt;p&gt;No - this can be totally normal based on usage patterns, restarts, etc...&lt;/p&gt;</comment>
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