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    <title>MongoDB Jira</title>
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    <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-66765] Enable the SpiderMonkey JIT by default</title>
                <link>https://jira.mongodb.org/browse/SERVER-66765</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Previously, we saw a lot of crashes when SpiderMonkey 60 JIT was enabled and we ended up turning it off in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32683&quot; title=&quot;Turn off the spidermonkey jit by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32683&quot;&gt;&lt;del&gt;SERVER-32683&lt;/del&gt;&lt;/a&gt; (BF-7559, BF-7548, BF-7140, BF-6782). Now that we&apos;ve upgraded to SpiderMonkey 91, this issue might be gone.&lt;/p&gt;

&lt;p&gt;As part of this ticket, we want to investigate the possibility of turning JIT on by default. &lt;/p&gt;

&lt;p&gt;We have one proof point that SpiderMonkey Baseline JIT was unintentionally enabled on &lt;tt&gt;master&lt;/tt&gt; between &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61008&quot; title=&quot;Upgrade MozJS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61008&quot;&gt;&lt;del&gt;SERVER-61008&lt;/del&gt;&lt;/a&gt; (&lt;a href=&quot;https://github.com/mongodb/mongo/commit/26bab136615f5f7a5d6c35e767e2321dcc31b956&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;master@26bab13&lt;/a&gt;) and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66498&quot; title=&quot;Disable Baseline JIT for MozJS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66498&quot;&gt;&lt;del&gt;SERVER-66498&lt;/del&gt;&lt;/a&gt; (&lt;a href=&quot;https://github.com/mongodb/mongo/commit/13ec926abfad8452f9e44196d5592577d245032e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;master@13ec926&lt;/a&gt;). However, we didn&apos;t see any crashes related to JIT, except for BUILD-14966 (which was expected due to a notarization issue).&lt;/p&gt;

&lt;p&gt;In addition, enabling Baseline JIT has shown a noticeable performance improvement for some performance tests (e.g., BF-25338), which justifies enabling it by default.&lt;/p&gt;

&lt;p&gt;There are several options for SpiderMonkey JIT (e.g., Baseline JIT, ION JIT, etc.) As part of this ticket, we want to enable the Baseline JIT by default. But, it makes sense to also evaluate the impact of more aggressive JIT engines in SpiderMonkey 91 and check whether they cause crashes or not.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2055129">SERVER-66765</key>
            <summary>Enable the SpiderMonkey JIT by default</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mohammad.dashti@mongodb.com">Mohammad Dashti</reporter>
                        <labels>
                    </labels>
                <created>Wed, 25 May 2022 18:00:08 +0000</created>
                <updated>Tue, 6 Dec 2022 00:05:06 +0000</updated>
                            <resolved>Tue, 31 May 2022 16:12:11 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
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            <issuekey id="482391">SERVER-32683</issuekey>
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            <issuekey id="1909864">SERVER-61008</issuekey>
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            <issuekey id="2047740">SERVER-66498</issuekey>
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