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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>
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<item>
            <title>[SERVER-663] need to test memory mapped file performance on freebsd</title>
                <link>https://jira.mongodb.org/browse/SERVER-663</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;see &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/e0a5b279a6389d2c/186f153e39ee2fe5?hl=en&amp;amp;lnk=gst&amp;amp;q=freebsd#186f153e39ee2fe5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/e0a5b279a6389d2c/186f153e39ee2fe5?hl=en&amp;amp;lnk=gst&amp;amp;q=freebsd#186f153e39ee2fe5&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="11361">SERVER-663</key>
            <summary>need to test memory mapped file performance on freebsd</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                            <label>freebsd</label>
                            <label>fsync</label>
                            <label>mmap</label>
                            <label>msync</label>
                    </labels>
                <created>Tue, 23 Feb 2010 17:03:26 +0000</created>
                <updated>Tue, 6 Dec 2022 05:50:46 +0000</updated>
                            <resolved>Wed, 30 Dec 2015 19:51:39 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>7</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="161301" author="reedobrien" created="Thu, 6 Sep 2012 19:59:30 +0000"  >&lt;p&gt;Somewhere in one of those email threads, specifically this one:&lt;br/&gt;
&lt;a href=&quot;http://lists.freebsd.org/pipermail/freebsd-stable/2011-December/065108.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://lists.freebsd.org/pipermail/freebsd-stable/2011-December/065108.html&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It appears a patch was made to help &amp;#8211; hopefully fix &amp;#8211; this. It looks like it missed the 9.0 release but is landing in 9.1:&lt;br/&gt;
&lt;a href=&quot;http://svnweb.freebsd.org/base/releng/9.1/sys/vm/vm_object.c?r1=225736&amp;amp;r2=229695&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://svnweb.freebsd.org/base/releng/9.1/sys/vm/vm_object.c?r1=225736&amp;amp;r2=229695&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I haven&apos;t tested it yet, but have my fingers crossed.&lt;/p&gt;</comment>
                            <comment id="118962" author="mrludo" created="Sun, 13 May 2012 23:43:29 +0000"  >&lt;p&gt;We are operating a production master/slave pair running FreeBSD 8.2 running mongo 2.0.2 and the master server is infrequently becoming unresponsive (once every two to three weeks).&lt;/p&gt;

&lt;p&gt;db.currentOp() has been reporting the slave replication connection as the active process during the problem.&lt;/p&gt;

&lt;p&gt;We have seen similar symptoms during the problem.&lt;/p&gt;

&lt;p&gt;Has anyone verified the efficacy of the patch with regard to journalling ?&lt;/p&gt;</comment>
                            <comment id="112158" author="ssandler" created="Fri, 20 Apr 2012 21:37:59 +0000"  >&lt;p&gt;I have done extensive load testing on freebsd 8.2, mongo 2.0.2, with and without the patch mentioned in Scott&apos;s post. I have found that I can very consistently get to about 10x the concurrency with the patch vs. without. In either case global lock queueing is the first bottleneck. These tests were done with journaling off (we originally had journaling on, but found turning it off helped mitigate a bit of the lock queueing we were seeing). &lt;/p&gt;</comment>
                            <comment id="83366" author="alvin" created="Mon, 30 Jan 2012 16:59:30 +0000"  >&lt;p&gt;And discussed here&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.mail-archive.com/freebsd-stable@freebsd.org/msg118225.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mail-archive.com/freebsd-stable@freebsd.org/msg118225.html&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="73594" author="scotthernandez" created="Fri, 16 Dec 2011 02:00:03 +0000"  >&lt;p&gt;It seems from this discussion that using fsync is more appropriate on freebsd. Not sure about journaling ramifications.&lt;/p&gt;

&lt;p&gt;Patch: &lt;a href=&quot;http://zonov.org/mongodb/patch-util-mmap_posix.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://zonov.org/mongodb/patch-util-mmap_posix.cpp&lt;/a&gt;&lt;br/&gt;
Discussion: &lt;a href=&quot;http://lists.freebsd.org/pipermail/freebsd-stable/2011-December/064844.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://lists.freebsd.org/pipermail/freebsd-stable/2011-December/064844.html&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="38859" author="balboah" created="Thu, 23 Jun 2011 09:10:37 +0000"  >&lt;p&gt;FreeBSD 8.2 with mongo 1.8.1 doesn&apos;t seem too quick with multiple inserts either, actually 10+ times slower than other machines running mac and linux&lt;/p&gt;</comment>
                            <comment id="22267" author="philipsoutham" created="Tue, 11 Jan 2011 18:02:45 +0000"  >&lt;p&gt;The behavior outlined in the referenced discussion thread still seems to be a problem on 1.6.5 running within FreeBSD 8.1.&lt;/p&gt;</comment>
                    </comments>
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