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    <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-2637] Optimize spheredist_rad function present in db/geo/core.h</title>
                <link>https://jira.mongodb.org/browse/SERVER-2637</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/db/geo/core.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/db/geo/core.h&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The function spheredist_rad can be optimized in two ways:&lt;/p&gt;

&lt;p&gt;1) use a faster (but correct) formula: take a loook to &lt;a href=&quot;http://www.movable-type.co.uk/scripts/latlong.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.movable-type.co.uk/scripts/latlong.html&lt;/a&gt;&lt;br/&gt;
I would suggest the Spherical Law of Cosines, I&apos;ve tested it and seems to work very well.&lt;/p&gt;

&lt;p&gt;2) then use a function that calculate sin and cos at the same time (saving in this way half of trigonometric functions): for example on x86/x86_64 there are several options (standard fsincos assembly function, SSE2 optimizations)&lt;/p&gt;
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                <environment></environment>
        <key id="14921">SERVER-2637</key>
            <summary>Optimize spheredist_rad function present in db/geo/core.h</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="-1">Unassigned</assignee>
                                    <reporter username="muratmat">Matteo Muratori</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 28 Feb 2011 15:37:01 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:53 +0000</updated>
                            <resolved>Mon, 14 Jan 2013 16:48:28 +0000</resolved>
                                    <version>1.8.0-rc0</version>
                                                    <component>Geo</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="239438" author="hari.khalsa@10gen.com" created="Mon, 14 Jan 2013 16:48:28 +0000"  >&lt;p&gt;There is a new index type forthcoming, 2dsphere, that handles spherical indexing better.&lt;/p&gt;</comment>
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