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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-17407] Significant performance degradation between SA mongod to replica set on insert only workload</title>
                <link>https://jira.mongodb.org/browse/SERVER-17407</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;v3.0.0-Rc11&lt;/p&gt;


&lt;p&gt;Environment:&lt;/p&gt;

&lt;p&gt;&#8226; Replica set with 2 nodes vs. stand alone mongod &lt;br/&gt;
&#8226; The measurement has been taken from the same machine, when it was configured as replica set the machine worked as primary.&lt;br/&gt;
&#8226; Windows 2012 magnatic drive &lt;/p&gt;

&lt;p&gt;Workload:&lt;br/&gt;
&#8226; Used hammer.mongo to do insert only workload&lt;/p&gt;


&lt;p&gt;Measured a signficent amount of performance degrdation between Stand Alone to Replica set&lt;/p&gt;

&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Measurements &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Stand alone performance &lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Replica set (2 members)&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt;Performance difference &lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;IO Write throughput&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 12 K operations/sec&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2 K operations/sec &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; -84%&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MongoStat info&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 15 K inserts/sec&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;2 K insert/sec &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;  ..TBD..&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Context switchs&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;36 K&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;4.5K&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;nbsp;&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;More details @ &lt;a href=&quot;https://docs.google.com/a/10gen.com/document/d/1RyvsyEs0HygsSZJ1hs_02yWxR-NEzjRNi6jf6I38GSo/edit?usp=sharing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/a/10gen.com/document/d/1RyvsyEs0HygsSZJ1hs_02yWxR-NEzjRNi6jf6I38GSo/edit?usp=sharing&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;will work to identify the bottleneck &lt;/p&gt;</description>
                <environment></environment>
        <key id="186594">SERVER-17407</key>
            <summary>Significant performance degradation between SA mongod to replica set on insert only workload</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="4">Incomplete</resolution>
                                        <assignee username="chung-yen.chang">Chung-yen Chang</assignee>
                                    <reporter username="eitan.klein">Eitan Klein</reporter>
                        <labels>
                            <label>28qa</label>
                            <label>wttt</label>
                    </labels>
                <created>Fri, 27 Feb 2015 15:15:58 +0000</created>
                <updated>Mon, 14 Sep 2015 22:44:13 +0000</updated>
                            <resolved>Mon, 14 Sep 2015 22:44:13 +0000</resolved>
                                    <version>3.0.0-rc11</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1010020" author="david.daly" created="Wed, 19 Aug 2015 20:17:35 +0000"  >&lt;p&gt;A much smaller regression is visible on mongo-perf in evergreen. Can compare &lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_standalone_insert_6be756dd654c03049c094c55cb038b0b3305631b_15_08_19_06_09_31##%7B%22perftab%22:1%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;standalone&lt;/a&gt; and &lt;a href=&quot;https://evergreen.mongodb.com/task/performance_linux_wt_repl_insert_6be756dd654c03049c094c55cb038b0b3305631b_15_08_19_06_09_31##%7B%22perftab%22:1%7D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;1 node repl&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;There&apos;s also &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19975&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-19975&lt;/a&gt; but that seems like it&apos;s probably a later issue. &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="175116">SERVER-16575</issuekey>
        </issuelink>
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                <attachments>
                            <attachment id="86867" name="InsertOnlySAvsReplSetWindows.png" size="11149" author="eitan.klein" created="Thu, 20 Aug 2015 15:02:52 +0000"/>
                            <attachment id="65957" name="ReplicaSetMember (1).csv" size="108605" author="eitan.klein" created="Fri, 27 Feb 2015 15:15:58 +0000"/>
                            <attachment id="65956" name="ReplicaSetMember - MongoStat.txt" size="2415" author="eitan.klein" created="Fri, 27 Feb 2015 15:15:58 +0000"/>
                            <attachment id="65958" name="ReplicaSetMemberLog.txt" size="124400" author="eitan.klein" created="Fri, 27 Feb 2015 15:15:58 +0000"/>
                            <attachment id="65959" name="SA.csv" size="217098" author="eitan.klein" created="Fri, 27 Feb 2015 15:15:58 +0000"/>
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                            <attachment id="68146" name="Screen Shot 2015-03-18 at 5.13.21 PM.png" size="47381" author="robert.guo@mongodb.com" created="Thu, 19 Mar 2015 16:31:44 +0000"/>
                            <attachment id="68316" name="Screen Shot 2015-03-20 at 12.40.47 PM.png" size="23985" author="robert.guo@mongodb.com" created="Sat, 21 Mar 2015 18:12:35 +0000"/>
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