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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6789] Improve performance of flushing data files when using lots of databases/data files</title>
                <link>https://jira.mongodb.org/browse/SERVER-6789</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The _flushAll method in mmap.cpp does an n^2 iteration of all the datafiles to sync them to disk (it only calls flush once per file, however, which is good).  It also acquires and releases the files lock between flushing each file.  When running with very large numbers of data files (usually from having a large number of databases), this can cause the flush to take a long time even if there isn&apos;t much data to flush.&lt;/p&gt;</description>
                <environment></environment>
        <key id="47453">SERVER-6789</key>
            <summary>Improve performance of flushing data files when using lots of databases/data files</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Aug 2012 15:35:23 +0000</created>
                <updated>Wed, 10 Dec 2014 23:06:21 +0000</updated>
                            <resolved>Fri, 22 Nov 2013 21:03:53 +0000</resolved>
                                    <version>2.0.7</version>
                    <version>2.2.0-rc1</version>
                                                    <component>Performance</component>
                                        <votes>2</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="460597" author="dan@10gen.com" created="Fri, 22 Nov 2013 21:03:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7973&quot; title=&quot;Mongo should be able to reply to client requests for data in RAM while flushing to disk&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7973&quot;&gt;&lt;del&gt;SERVER-7973&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="458389" author="bruce.lucas@10gen.com" created="Tue, 19 Nov 2013 13:57:06 +0000"  >&lt;p&gt;In addition it uses a tree set which adds an extra factor of log n; just changing that to a hash set (unordered_set) without touching the n^2 loops reduces the time by a factor of 4 for 5000 databases.&lt;/p&gt;</comment>
                            <comment id="307725" author="christopher.price@mtvn.com" created="Sun, 7 Apr 2013 01:27:37 +0000"  >&lt;p&gt;Does this potentially block or slow down reads?  If not, what is the negative impact to a system when this runs for a very long time?&lt;/p&gt;</comment>
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