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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>
    </build-info>


<item>
            <title>[SERVER-27823] Update microbenchmarks to run against wiredTiger in addition to inMemory</title>
                <link>https://jira.mongodb.org/browse/SERVER-27823</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;1. We would use the same command line arguments as before:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;mongod_flags: &quot;--storageEngine=wiredTiger --logpath ./mongod.log --fork --syncdelay 0 --nojournal --setParameter ttlMonitorEnabled=false --setParameter diagnosticDataCollectionEnabled=false --wiredTigerCacheSizeGB 16&quot;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;2. We would only run the standalone variant for wiredTiger, that means without oplog. This configuration does not suffer from the issue with fsyncs being necessary for commits, which was the reason to move to inMemory engine.&lt;/p&gt;

&lt;p&gt;2b. We would not run wiredTiger with oplog on at all in Microbenchmarks. The Microbenchmarks project is specifically designed to NOT do IO, and having one variant that does that would just be confusing and we would probably waste a lot of time trying to understand and reproduce the results. (On this note: hopefully we get sys-perf back in the game soon.)&lt;/p&gt;

&lt;p&gt;3. Unrelated, but the current display names are a bit sub-optimal in the UI. Having the storage engine last, it is often not shown at all in the UI. The word Linux is redundant, as that&apos;s constant. So I would rather switch to &quot;Standalone wiredTiger Linux&quot; (with Linux last)&lt;/p&gt;

&lt;p&gt;3b. For same reasons also proposing to change &quot;1-Node ReplSet&quot; to just &quot;ReplSet1&quot;&lt;/p&gt;

&lt;p&gt;4. When we changed to inMemory engine, we didn&apos;t change the Evergreen variant ids, because that would have been very hard (we wanted to keep the history). We only changed the display name. So now we have:&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;

&lt;p&gt;If we want to get wiredTiger engine back running, I would suggest we abandon this hack, otherwise it becomes too confusing. The variants would then be:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  - name: linux-wt-standalone&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    display_name: Standalone wiredTiger Linux&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    ...&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    display_name: Standalone inMemory Linux&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    ...&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    display_name: ReplSet1 inMemory Linux&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    ...&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;5. For clarity:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;linux-wt-standalone would regain the history of Standalone wiredTiger tests, with a short period of inMemory engine in between&lt;/li&gt;
	&lt;li&gt;What is currently linux-wt-repl is discontinued and history is not inherited by anyone&lt;/li&gt;
	&lt;li&gt;linux-memory-standalone and linux-memory-repl will start fresh with no history&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="339128">SERVER-27823</key>
            <summary>Update microbenchmarks to run against wiredTiger in addition to inMemory</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="david.daly@mongodb.com">David Daly</reporter>
                        <labels>
                            <label>mtig</label>
                            <label>perf-stop-regressions</label>
                            <label>quick_wins</label>
                    </labels>
                <created>Thu, 15 Dec 2016 16:30:11 +0000</created>
                <updated>Mon, 4 Dec 2023 19:28:59 +0000</updated>
                            <resolved>Mon, 4 Dec 2023 19:28:58 +0000</resolved>
                                                    <fixVersion>4.1 Desired</fixVersion>
                                                        <votes>2</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5924199" author="steven.vannelli" created="Mon, 4 Dec 2023 19:28:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=miguel.nieto%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;miguel.nieto@mongodb.com&quot;&gt;miguel.nieto@mongodb.com&lt;/a&gt; - discussed with the team and we&apos;re comfortable closing this for now. Thanks!&lt;/p&gt;</comment>
                            <comment id="5523673" author="alexander.gorrod" created="Sun, 25 Jun 2023 23:12:16 +0000"  >&lt;p&gt;This still seems relevant - I believe we should be running our benchmarking in an environment as similar to what our users run as possible - even micro benchmarks.&lt;br/&gt;
OTOH: This hasn&apos;t had traction for a long time, and I don&apos;t see it being a priority immediately, so maybe it&apos;s best to close this out rather than leave it languishing.&lt;/p&gt;</comment>
                            <comment id="5497680" author="miguel.nieto" created="Wed, 14 Jun 2023 08:07:12 +0000"  >&lt;p&gt;Moved the ticket to Storage Execution Backlog. This is a 5 years old ticket to update microbenchmarks so they run on WiredTiger in addition to inMemory. Reaching out to you in order to get your opinion and understand if this is something you think it is still needed.&lt;/p&gt;</comment>
                            <comment id="1906425" author="henrik.ingo@10gen.com" created="Thu, 31 May 2018 08:05:21 +0000"  >&lt;p&gt;To discuss before implementing:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Double check with server engineer that the fsyncs introduced in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26685&quot; title=&quot;Primary journal and oplog visibility order must be consistent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26685&quot;&gt;&lt;del&gt;SERVER-26685&lt;/del&gt;&lt;/a&gt; are still happening and needed. I&apos;m mostly thinking wrt moving to using mongo timestamps in the wt journal.&lt;/li&gt;
	&lt;li&gt;Nowadays we seem much more confident in copying history data than when this ticket was written. The description can probably be much simplified if going that route.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="324791">SERVER-26685</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="238052">SERVER-21316</issuekey>
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            <issuekey id="330987">SERVER-26981</issuekey>
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