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    <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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            <title>[SERVER-35274] Add scons flag which enables -pg</title>
                <link>https://jira.mongodb.org/browse/SERVER-35274</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Gprof is a performance profiler. To enable it, you must pass the&#160;&lt;tt&gt;-pg&lt;/tt&gt; flag to the compiler. Binaries so compiled will dump performance counters to &apos;gmon.out&apos; on process exit. However, mongod does not exit normally, which prevents &apos;gmon.out&apos; from being generated. To properly flush the counters, we must declare an external function called &quot;_mcleanup()&quot; and call it during quickExit. This is a pattern used for coverage analysis, where we manually declare and call GCov&apos;s __gcov_flush function.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;We should add a scons flag which passes &lt;tt&gt;-pg&lt;/tt&gt; to the compiler, and enables a preprocessor flag which enables the declaration and call of _mcleanup.&lt;/p&gt;</description>
                <environment></environment>
        <key id="550796">SERVER-35274</key>
            <summary>Add scons flag which enables -pg</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-devtools">DO NOT USE - Backlog - Dev Tools</assignee>
                                    <reporter username="spencer.jackson@mongodb.com">Spencer Jackson</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Tue, 29 May 2018 18:59:30 +0000</created>
                <updated>Tue, 6 Dec 2022 19:10:30 +0000</updated>
                            <resolved>Mon, 14 Jan 2019 16:15:25 +0000</resolved>
                                                                    <component>Build</component>
                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1903765" author="milkie" created="Tue, 29 May 2018 19:06:48 +0000"  >&lt;p&gt;We already have MONGO_CPU_PROFILER preprocessor macro which does what you want in quickExit().&#160; &#160;(copy/paste fail!)&lt;/p&gt;</comment>
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