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    <title>MongoDB Jira</title>
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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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<item>
            <title>[SERVER-69991] C++ benchmarks running under ASAN?</title>
                <link>https://jira.mongodb.org/browse/SERVER-69991</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We&apos;ve been assigned a Buildfailure related to a runtime problem caused by a C++ benchmark running under DEBUG and ASAN.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/BF-26477&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/BF-26477&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;While I haven&apos;t yet investigated the cause here, it seems to be some kind of resource exhaustion inside the benchmark framework.&lt;/p&gt;

&lt;p&gt;The thing about it is that I&apos;m not sure of the value of running benchmarks under ASAN at all, since they&apos;re all about measuring performance, and ASAN imposes enormous performance penalties that would make the results of these computationally intensive tests useless.&lt;/p&gt;

&lt;p&gt;Should ASAN and DEBUG builds skip C++ benchmarks?&lt;/p&gt;</description>
                <environment></environment>
        <key id="2145495">SERVER-69991</key>
            <summary>C++ benchmarks running under ASAN?</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-perf">Backlog - Performance Team</assignee>
                                    <reporter username="billy.donahue@mongodb.com">Billy Donahue</reporter>
                        <labels>
                    </labels>
                <created>Mon, 26 Sep 2022 18:52:21 +0000</created>
                <updated>Mon, 5 Dec 2022 23:41:28 +0000</updated>
                            <resolved>Fri, 30 Sep 2022 22:34:34 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
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                            <comment id="4856842" author="billy.donahue" created="Mon, 26 Sep 2022 21:14:02 +0000"  >&lt;p&gt;Note: Linked BF-26477 was a false positive induced entirely by ASAN&apos;s interference with thread creation, during a benchmark that spawns threads in a loop.&lt;/p&gt;</comment>
                            <comment id="4856608" author="JIRAUSER1268551" created="Mon, 26 Sep 2022 19:51:39 +0000"  >&lt;p&gt;We can certainly exclude ASAN and&#160; DEBUG builds from running benchmarks but I would argue that we shouldn&apos;t. While I do agree that the perf numbers we get here are meaningless ASAN and DEBUG both run benchmarks with more coverage meaning that we can uncover testing bugs by doing so. I think that is worth ensuring that these stay green rather than just excluding them.&lt;/p&gt;</comment>
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