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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-4652] Don&apos;t use fallocate on NFS</title>
                <link>https://jira.mongodb.org/browse/SERVER-4652</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The fallback behavior of fallocate is extremely suboptimal on NFS as it does one synchronous write for every 64kB to allocate. The attached patch takes the approach recommended by NetAPP which is to use ftuncate to create a sparse file of the correct size when we detect NFS mounts. Testing shows that this improves insert performance 5-10%.&lt;/p&gt;

&lt;p&gt;Currently is uses linux-specific FS detection code and does this automatically without user intervention. It may be better to add a flag since there are other filesystems (in particular copy-on-write systems such as ZFS or BTRFS) where it is better to create a sparse file than fully allocating a file full of zeros.&lt;/p&gt;</description>
                <environment></environment>
        <key id="27989">SERVER-4652</key>
            <summary>Don&apos;t use fallocate on NFS</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Jan 2012 19:34:14 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:21 +0000</updated>
                            <resolved>Mon, 6 Feb 2012 21:03:01 +0000</resolved>
                                                    <fixVersion>2.1.1</fixVersion>
                                    <component>Performance</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="85819" author="auto" created="Mon, 6 Feb 2012 20:58:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: Temp disable test for BtrFS &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4652&quot; title=&quot;Don&amp;#39;t use fallocate on NFS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4652&quot;&gt;&lt;del&gt;SERVER-4652&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3078b6e9b25eab8883d546081bffe614c4d1c4c3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3078b6e9b25eab8883d546081bffe614c4d1c4c3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="85809" author="auto" created="Mon, 6 Feb 2012 20:49:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: Fix signed / unsigned comparison &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4652&quot; title=&quot;Don&amp;#39;t use fallocate on NFS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4652&quot;&gt;&lt;del&gt;SERVER-4652&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/78520fda45035bbdb1af6bc84ead2cde99f6c6eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/78520fda45035bbdb1af6bc84ead2cde99f6c6eb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="85801" author="auto" created="Mon, 6 Feb 2012 20:42:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: Use sparse files on freebsd, solaris, and when using NFS or BtrFS on linux &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4652&quot; title=&quot;Don&amp;#39;t use fallocate on NFS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4652&quot;&gt;&lt;del&gt;SERVER-4652&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b722567affe6ae082af56e56349d2c67bff26ade&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b722567affe6ae082af56e56349d2c67bff26ade&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="83508" author="redbeard0531" created="Tue, 31 Jan 2012 00:36:03 +0000"  >&lt;p&gt;OK, this is now implemented on my local checkout (with a different patch) but will not hit master until after 2.1.0.&lt;/p&gt;</comment>
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                            <attachment id="14353" name="ftruncate.patch" size="1073" author="mathias@mongodb.com" created="Mon, 9 Jan 2012 19:34:15 +0000"/>
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