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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-16185] tcmalloc issues with OS X 10.10</title>
                <link>https://jira.mongodb.org/browse/SERVER-16185</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mongodb shell has the ability to fork new processes as part of our testing framework.  After upgrading to OS X 10.10, I discovered that the shell now has odd behavior when forking:  after forking successfully two times, the third fork fails.  After calling the fork() function call, the parent receives a pid but the child never starts running and does not appear in a &apos;ps&apos; process list.&lt;br/&gt;
dtruss never shows the third fork system call completing, although it does show that the child process with the new pid is blocked on an internal semaphore.&lt;/p&gt;

&lt;p&gt;Compiling with --allocator=system seems to avoid this issue.  Note that MCI builds already build binaries for Mac OS X without tcmalloc.&lt;/p&gt;</description>
                <environment></environment>
        <key id="169646">SERVER-16185</key>
            <summary>tcmalloc issues with OS X 10.10</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="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Nov 2014 15:05:54 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:00 +0000</updated>
                            <resolved>Tue, 18 Nov 2014 18:04:50 +0000</resolved>
                                    <version>2.8.0-rc0</version>
                                    <fixVersion>2.8.0-rc1</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="767109" author="milkie" created="Tue, 18 Nov 2014 18:04:50 +0000"  >&lt;p&gt;I think resolving is the best course of action for now.&lt;/p&gt;</comment>
                            <comment id="767035" author="xgen-internal-githook" created="Tue, 18 Nov 2014 17:15:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16185&quot; title=&quot;tcmalloc issues with OS X 10.10&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16185&quot;&gt;&lt;del&gt;SERVER-16185&lt;/del&gt;&lt;/a&gt; Use system allocator by default on OS X&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/14ca6bfd67d5efb10fc21778246442c2f223dc1e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/14ca6bfd67d5efb10fc21778246442c2f223dc1e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="766505" author="acm" created="Mon, 17 Nov 2014 23:06:32 +0000"  >&lt;p&gt;Not really, no. &lt;/p&gt;</comment>
                            <comment id="766478" author="schwerin" created="Mon, 17 Nov 2014 22:40:39 +0000"  >&lt;p&gt;The debugging behavior aside, is there evidence that the OS X system implementation of malloc is inferior to tcmalloc?&lt;/p&gt;</comment>
                            <comment id="766465" author="acm" created="Mon, 17 Nov 2014 22:34:59 +0000"  >&lt;p&gt;I think so, but probably only temporarily until this is fixed. I&apos;d prefer that we have the same allocator across systems, long term. Or, someone should dig into the OS X allocator to understand how to achieve the same debugging / performance aspects that tcmalloc brings us on other UNIX-like systems.&lt;/p&gt;</comment>
                            <comment id="766448" author="eliot" created="Mon, 17 Nov 2014 22:23:00 +0000"  >&lt;p&gt;Should we just default to system allocator on os x?&lt;/p&gt;</comment>
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                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
                                        <issuelink>
            <issuekey id="130792">SERVER-27353</issuekey>
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                            <customfieldvalue>&lt;p&gt;Running this like so will reproduce the problem (the third fork will fail)&lt;br/&gt;
./mongo --nodb test.js&lt;/p&gt;

&lt;p&gt;You can even replace the &quot;mongod&quot; binary with &quot;true&quot; and it will still fail.&lt;/p&gt;
&lt;p/&gt;
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