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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>[DOCS-15268] Investigate changes in SERVER-56782: Reintroduce advanced microarchitecture targeting on macOS</title>
                <link>https://jira.mongodb.org/browse/DOCS-15268</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    We were unable to make this change before we had a native Apple Silicon build because Rosetta 2 could not handle the AVX instructions generated when targeting sandybridge or newer.&lt;/p&gt;

&lt;p&gt;After this change, server binaries on macOS will require a &lt;tt&gt;haswell&lt;/tt&gt; or newer CPU. Note that this is a more aggressive posture than the sandybridge requirement we already have on non-macOS (though not by much), so we will need to document it. The rationale for jumping to &lt;tt&gt;haswell&lt;/tt&gt; is that Apple offers a known architecture &quot;slice&quot; type for this platform, and targeting it will hopefully provide a better user experience if an attempt is made to run the software on a platform which does not meet the hardware requirements.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ clang++ ./hello_world.cpp -arch x86_64h&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ arch -x86_64h ./a.out&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Hello, World!&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ arch -x86_64 ./a.out&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;arch: posix_spawnp: ./a.out: Bad CPU type in executable&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;That&apos;s better than just getting a &lt;tt&gt;SIGILL&lt;/tt&gt; kill.&lt;/p&gt;

&lt;p&gt;All apple systems introduced after 2013 are haswell or newer: &lt;a href=&quot;https://en.wikipedia.org/wiki/List_of_Macintosh_models_grouped_by_CPU_type#Ivy_Bridge&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://en.wikipedia.org/wiki/List_of_Macintosh_models_grouped_by_CPU_type#Ivy_Bridge&lt;/a&gt;&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54407&quot; title=&quot;Specify a microarchitecture minimum for x86_64 builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54407&quot;&gt;&lt;del&gt;SERVER-54407&lt;/del&gt;&lt;/a&gt; we bumped the required x86_64 microarchitecture to &lt;tt&gt;sandybridge&lt;/tt&gt; but we backed out of that on macOS in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56728&quot; title=&quot;Cannot run 4.9+ on Apple Silicon&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56728&quot;&gt;&lt;del&gt;SERVER-56728&lt;/del&gt;&lt;/a&gt; because Rosetta 2 doesn&apos;t support AVX instructions, among others. Once we have native Apple Silicon builds and no longer need to rely on Rosetta 2, we can reintroduce targeting. We may in fact be able to target more aggressively, and bump to &lt;tt&gt;-arch x86_64h&lt;/tt&gt;, per the comments and links in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56728&quot; title=&quot;Cannot run 4.9+ on Apple Silicon&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56728&quot;&gt;&lt;del&gt;SERVER-56728&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2031011">DOCS-15268</key>
            <summary>Investigate changes in SERVER-56782: Reintroduce advanced microarchitecture targeting on macOS</summary>
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                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>backlog</label>
                            <label>request</label>
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                <created>Fri, 22 Apr 2022 13:04:01 +0000</created>
                <updated>Mon, 22 Jan 2024 16:13:45 +0000</updated>
                                                                            <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
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