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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-11010] Building without NDEBUG defined causes tcmalloc to prefer the mmap allocator to sbrk allocator</title>
                <link>https://jira.mongodb.org/browse/SERVER-11010</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We don&apos;t currently set NDEBUG for our --dbg=off builds, instead relying on _DEBUG.&lt;/p&gt;

&lt;p&gt;The only standard mandated behavior for NDEBUG is that it alters the semantics of &apos;assert&apos;. And we don&apos;t use bare asserts in the mongodb source.&lt;/p&gt;

&lt;p&gt;However, the code in third_party may interpret NDEBUG, and, in particular, tcmalloc cares.&lt;/p&gt;

&lt;p&gt;Please see &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cc506fc6a274b57ee31dac021cdecd5aee084d08/src/third_party/gperftools-2.0/src/system-alloc.cc#L80-L84&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/cc506fc6a274b57ee31dac021cdecd5aee084d08/src/third_party/gperftools-2.0/src/system-alloc.cc#L80-L84&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The consequence is that kDebugMode becomes true, which is used:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/cc506fc6a274b57ee31dac021cdecd5aee084d08/src/third_party/gperftools-2.0/src/system-alloc.cc#L457-L464&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/cc506fc6a274b57ee31dac021cdecd5aee084d08/src/third_party/gperftools-2.0/src/system-alloc.cc#L457-L464&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;to determine whether to prefer the mmap or sbrk allocator.&lt;/p&gt;

&lt;p&gt;Since we don&apos;t define NDEBUG, tcmalloc ends up preferring the mmap allocator, which is not its intended production deployment configuration.&lt;/p&gt;</description>
                <environment></environment>
        <key id="92450">SERVER-11010</key>
            <summary>Building without NDEBUG defined causes tcmalloc to prefer the mmap allocator to sbrk allocator</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="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Oct 2013 18:25:38 +0000</created>
                <updated>Mon, 11 Jul 2016 17:39:05 +0000</updated>
                            <resolved>Thu, 3 Oct 2013 18:34:45 +0000</resolved>
                                                    <fixVersion>2.5.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="435418" author="auto" created="Thu, 3 Oct 2013 20:11:24 +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@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11010&quot; title=&quot;Building without NDEBUG defined causes tcmalloc to prefer the mmap allocator to sbrk allocator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11010&quot;&gt;&lt;del&gt;SERVER-11010&lt;/del&gt;&lt;/a&gt; Use Append rather than AppendUnique to fix build breakage&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/adabaf90744d3e661622849e44b63f2395188703&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/adabaf90744d3e661622849e44b63f2395188703&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="435346" author="auto" created="Thu, 3 Oct 2013 18:33:28 +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@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11010&quot; title=&quot;Building without NDEBUG defined causes tcmalloc to prefer the mmap allocator to sbrk allocator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11010&quot;&gt;&lt;del&gt;SERVER-11010&lt;/del&gt;&lt;/a&gt; For non-debug builds, build gperftools with NDEBUG to prefer the sbrk allocator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/09778704b9d7f8fb8b0d1ab170e2cf502387b78b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/09778704b9d7f8fb8b0d1ab170e2cf502387b78b&lt;/a&gt;&lt;/p&gt;</comment>
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