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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6528] mongod pmap contain db files not in one copy</title>
                <link>https://jira.mongodb.org/browse/SERVER-6528</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="44861">SERVER-6528</key>
            <summary>mongod pmap contain db files not in one copy</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="azat">Azat Khuzhin</reporter>
                        <labels>
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                <created>Thu, 19 Jul 2012 19:44:58 +0000</created>
                <updated>Wed, 15 Aug 2012 14:24:21 +0000</updated>
                            <resolved>Fri, 20 Jul 2012 03:39:45 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="145336" author="azat" created="Fri, 20 Jul 2012 15:26:10 +0000"  >&lt;p&gt;Thanks for the explanation&lt;/p&gt;</comment>
                            <comment id="145329" author="schwerin" created="Fri, 20 Jul 2012 15:11:00 +0000"  >&lt;p&gt;It does not increase the physical memory consumption. The private view and shared view are nearly the same, except that the private view contains writes that have not yet been retired out of the journal.  Up to 100MB worth of data in the two views are allowed to be distinct, but this could be thought of as space to buffer uncommitted writes.&lt;/p&gt;

&lt;p&gt;The virtual address space consumption is a little under double the physical memory consumption, for this reason.  On 64-bit x86 systems available today, this would limit a single mongod to storing around 64TB worth of data, even though there are 128TB of virtual address space available to a process.&lt;/p&gt;</comment>
                            <comment id="145250" author="azat" created="Fri, 20 Jul 2012 10:45:57 +0000"  >&lt;p&gt;Does this increase the memory usage?&lt;br/&gt;
For what mongod may need and MAP_PRIVATE and MAP_SHARED ?&lt;/p&gt;</comment>
                            <comment id="145183" author="eliot" created="Fri, 20 Jul 2012 03:39:39 +0000"  >&lt;p&gt;This is normal.&lt;br/&gt;
There is a for the private view, and 1 for the shared.&lt;/p&gt;</comment>
                            <comment id="145052" author="azat" created="Thu, 19 Jul 2012 19:47:59 +0000"  >&lt;p&gt;Is it normal and why it is possible?&lt;br/&gt;
Thanks.&lt;/p&gt;</comment>
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                            <attachment id="18281" name="mongod-pmap-db-files-not-in-one-copy" size="32852" author="azat" created="Thu, 19 Jul 2012 19:46:39 +0000"/>
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