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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21728] Disable extra threads for JSRuntimes</title>
                <link>https://jira.mongodb.org/browse/SERVER-21728</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When extra threads are enabled in spidermonkey, objects with finalizers cannot be run from garbage collection threads.  This prevents any of our native types from reaping in hot loops in js (at idle the main thread may decide to gc).&lt;/p&gt;

&lt;p&gt;By invoking js::DisableExtraThreads() we can prevent all of the various helper threads from getting spun up.  This means compilation, gc, etc. are all run from the runtime they&apos;re invoke in, rather than a helper.  Unfortunately js::DisableExtraThreads is in vm/Runtime.h, a non-public header.  We can simply forward declare it ourselves.&lt;/p&gt;

&lt;p&gt;This appears to fix the memory leaks we see in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21709&quot; title=&quot;Map Reduce causes segfault in 3.2 RC4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21709&quot;&gt;&lt;del&gt;SERVER-21709&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="241830">SERVER-21728</key>
            <summary>Disable extra threads for JSRuntimes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Dec 2015 04:29:06 +0000</created>
                <updated>Tue, 8 Dec 2015 14:20:08 +0000</updated>
                            <resolved>Thu, 3 Dec 2015 16:10:40 +0000</resolved>
                                    <version>3.2.0-rc5</version>
                                    <fixVersion>3.2.0-rc6</fixVersion>
                                    <component>JavaScript</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1103487" author="xgen-internal-githook" created="Wed, 2 Dec 2015 19:02:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hanumantmk&apos;, u&apos;name&apos;: u&apos;Jason Carey&apos;, u&apos;email&apos;: u&apos;jcarey@argv.me&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21728&quot; title=&quot;Disable extra threads for JSRuntimes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21728&quot;&gt;&lt;del&gt;SERVER-21728&lt;/del&gt;&lt;/a&gt; Disable extra JS Threads&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0eb5b0ecc379a5ad1b00aab56e7432ce76d13ac9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0eb5b0ecc379a5ad1b00aab56e7432ce76d13ac9&lt;/a&gt;&lt;/p&gt;</comment>
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