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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-49095] Evaluate running unittests with WT</title>
                <link>https://jira.mongodb.org/browse/SERVER-49095</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When ephermeralfortest is complete and all unittests support document level storage engines, it might be possible to run unittests with WiredTiger. Supporting multiple storage engines reduces the risk of building in assumptions about the storage engine in the tests.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1390208">SERVER-49095</key>
            <summary>Evaluate running unittests with WT</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
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                <created>Thu, 25 Jun 2020 13:43:21 +0000</created>
                <updated>Tue, 6 Dec 2022 02:21:05 +0000</updated>
                            <resolved>Mon, 1 Mar 2021 19:52:17 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3223842" author="acm" created="Thu, 25 Jun 2020 14:22:16 +0000"  >&lt;p&gt;Unfortunately, compiling the unit tests is one of the most expensive tasks we have in terms of build time. The new dynamic linker mode has improved things dramatically for the builders where it applies (notably, non-windows non-shipping), but doubling the amount of compile work is probably not a viable option. I also worry about making the unit tests modal. To be clear, I do like the idea of the additional coverage here: knowing that the unit tests that &lt;b&gt;shouldn&apos;t&lt;/b&gt; depend on the storage engine are in fact independent of storage engine seems like a win. But it seems like there are at least three classes of tests: tests that don&apos;t use a storage engine and are unaffected or agnostic to this, tests that do use a storage engine and should be storage engine independent, and tests which test a specific storage engine which should not be run with &quot;alternates&quot;.&lt;/p&gt;

&lt;p&gt;So  I think I agree with your analysis that this is something more like a mini-project.&lt;/p&gt;</comment>
                            <comment id="3223791" author="henrik.edin" created="Thu, 25 Jun 2020 14:08:14 +0000"  >&lt;p&gt;I think if the evaluation on how far we are from being able to use WT in unittests (this ticket) is successful, we would need to think about how to make it actually work. I envisioned it as a separate builder where we select the storage engine with a compile time flag to make sure we link in the correct libraries. I think the least amount of work is the key here, being able to select storage engine at runtime does not seem that important. &lt;/p&gt;

&lt;p&gt;But perhaps this is more work than a single ticket and is more like a mini project. I think a PoC/evaluation is a good first step.&lt;/p&gt;
</comment>
                            <comment id="3223742" author="acm" created="Thu, 25 Jun 2020 13:58:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=henrik.edin&quot; class=&quot;user-hover&quot; rel=&quot;henrik.edin&quot;&gt;henrik.edin&lt;/a&gt; - Can you explain in more detail how this would work? Would we need to recompile the unit tests? Or would there be a startup flag that controlled which storage engine we used, and we ran them twice? How would we identify which tests were modal? I think there are a lot of subtleties to getting this done.&lt;/p&gt;</comment>
                            <comment id="3223737" author="henrik.edin" created="Thu, 25 Jun 2020 13:55:31 +0000"  >&lt;p&gt;I don&apos;t think TSAN can work with WT? But TSAN on the builders using the radix tree storage engine should not be affected by adding an additional WT based builder without TSAN.&lt;/p&gt;</comment>
                            <comment id="3223723" author="acm" created="Thu, 25 Jun 2020 13:50:12 +0000"  >&lt;p&gt;What would the implications be for TSAN if we did this?&lt;/p&gt;</comment>
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