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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-56728] Cannot run 4.9+ on Apple Silicon</title>
                <link>https://jira.mongodb.org/browse/SERVER-56728</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongo 4.9+ cannot start on M1 laptops:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt; tracked down that this is because the ISA targeting for the server build was upgraded in 4.9 to sandybridge, which uses AVX instructions that are not handled by Rosetta: &lt;br/&gt;
&lt;a href=&quot;https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment&lt;/a&gt;&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Rosetta translates all x86_64 instructions, but it doesn&apos;t support the execution of some newer instruction sets and processor features, such as AVX, AVX2, and AVX512 vector instructions.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;He recommended special case downgrading the macOS target ISA to something that doesn&#8217;t generate AVX until we have a native Apple Silicon build.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1705415">SERVER-56728</key>
            <summary>Cannot run 4.9+ on Apple Silicon</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="13201">Fixed</resolution>
                                        <assignee username="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="louisa.berger@mongodb.com">Louisa Berger</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 May 2021 19:13:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:56 +0000</updated>
                            <resolved>Sun, 9 May 2021 16:33:34 +0000</resolved>
                                                    <fixVersion>4.9.0-rc1</fixVersion>
                    <fixVersion>5.0.0-rc0</fixVersion>
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                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3762812" author="xgen-internal-githook" created="Sun, 9 May 2021 16:08:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &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; Don&apos;t enable sandybridge optimizations for macOS&lt;/p&gt;

&lt;p&gt;Doing so allows AVX instructions, but those aren&apos;t supported on&lt;br/&gt;
Rosetta 2. We can restore this one we have native Apple Silicon&lt;br/&gt;
builds.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d740377ed7aa5bf944aa0750eb5a14379314f6c3)&lt;br/&gt;
Branch: v4.9&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/925e0ea2b6ea9d4377d0be9f6305a74b69d580eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/925e0ea2b6ea9d4377d0be9f6305a74b69d580eb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3762797" author="xgen-internal-githook" created="Sun, 9 May 2021 14:41:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrew Morrow&apos;, &apos;email&apos;: &apos;acm@mongodb.com&apos;, &apos;username&apos;: &apos;acmorrow&apos;}
&lt;p&gt;Message: &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; Don&apos;t enable sandybridge optimizations for macOS&lt;/p&gt;

&lt;p&gt;Doing so allows AVX instructions, but those aren&apos;t supported on&lt;br/&gt;
Rosetta 2. We can restore this one we have native Apple Silicon&lt;br/&gt;
builds.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d740377ed7aa5bf944aa0750eb5a14379314f6c3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d740377ed7aa5bf944aa0750eb5a14379314f6c3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3759644" author="acm" created="Thu, 6 May 2021 19:19:02 +0000"  >&lt;p&gt;This is a consequence of &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; where we bumped our target microarchitecture to &lt;tt&gt;sandybridge&lt;/tt&gt;. That entitled the compiler to start emitting AVX instructions. Unfortunately, Rosetta2 does not support those instructions, per &lt;a href=&quot;https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;We will need to downgrade the microarchitecture targeting for macOS to something which does not contain AVX instructions, probably &lt;tt&gt;core2&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Once we have a native Apple Silicon build, we can reevaluate microarchitecture targeting for macOS.&lt;/p&gt;</comment>
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