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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-12787] Strange performance characteristics of write ops in shell</title>
                <link>https://jira.mongodb.org/browse/SERVER-12787</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running these two cases shows some unexpectedly huge discrepancy in run time:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;raw smoke.py: 4697 ms&lt;br/&gt;
--use-write-commands: 8640 ms&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;raw smoke.py: 4769 ms&lt;br/&gt;
--use-write-commands: 305 ms&lt;/p&gt;</description>
                <environment></environment>
        <key id="111973">SERVER-12787</key>
            <summary>Strange performance characteristics of write ops in shell</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="3">Duplicate</resolution>
                                        <assignee username="davide.italiano">Davide Italiano</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Feb 2014 17:13:38 +0000</created>
                <updated>Wed, 10 Dec 2014 23:06:31 +0000</updated>
                            <resolved>Tue, 4 Mar 2014 13:16:18 +0000</resolved>
                                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="508822" author="dan@10gen.com" created="Tue, 4 Mar 2014 13:16:18 +0000"  >&lt;p&gt;duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12950&quot; title=&quot;Ordered write commands in mongos do not correctly break batches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12950&quot;&gt;&lt;del&gt;SERVER-12950&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="508732" author="davide.italiano" created="Tue, 4 Mar 2014 05:40:00 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/24f85cdfdba1db685f4da499d8fcb77385e57da7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/24f85cdfdba1db685f4da499d8fcb77385e57da7&lt;/a&gt; fixes the regression, and I&apos;m positive this can be closed, if &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=renctan&quot; class=&quot;user-hover&quot; rel=&quot;renctan&quot;&gt;renctan&lt;/a&gt; agrees. You can see that in the screenshot attached.&lt;/p&gt;</comment>
                            <comment id="507854" author="davide.italiano" created="Mon, 3 Mar 2014 04:20:44 +0000"  >&lt;p&gt;Looks roughly the same to me. Let&apos;s wait for the other ticket to be resolved and see if this is fixed as well before marking a duplicate, IMHO.&lt;/p&gt;</comment>
                            <comment id="507843" author="dan@10gen.com" created="Mon, 3 Mar 2014 03:52:45 +0000"  >&lt;p&gt;Isn&apos;t this &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12950&quot; title=&quot;Ordered write commands in mongos do not correctly break batches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12950&quot;&gt;&lt;del&gt;SERVER-12950&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
                            <comment id="507839" author="davide.italiano" created="Mon, 3 Mar 2014 03:32:44 +0000"  >&lt;p&gt;I&apos;m able to reproduce the behavior in my mongo-perf testing, on a scenario where empty documents are inserted in batch in a sharded cluster.&lt;br/&gt;
It looks like the increasing the size of batch just makes the regression more evident. Simple screenshot attached when batchsize is equal to 10. It gets worse on multithreaded tests, for your information.&lt;/p&gt;

&lt;p&gt;Some numbers:&lt;br/&gt;
Batchsize&amp;lt;2&amp;gt; : 37540.96 ops/s vs 22362.15 ops/s (1.67x faster)&lt;br/&gt;
Batchsize&amp;lt;10&amp;gt;: 82057.41 ops/s vs 22601.14 ops/s (3.63x faster)&lt;br/&gt;
Batchsize&amp;lt;100&amp;gt;: 133014.63 ops/s vs 23140.15 ops/sec (5.74x faster)&lt;br/&gt;
Batchsize&amp;lt;1000&amp;gt;: 148945.39 ops/s vs 23329.08 (6.38x faster)&lt;/p&gt;

&lt;p&gt;It&apos;s possible that the size of document could be a significant factor in the test &amp;#8211; but I haven&apos;t tried to change it.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="115487">SERVER-12950</issuekey>
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                <attachments>
                            <attachment id="38742" name="Screenshot 2014-03-02 19.24.33.png" size="199391" author="davide.italiano" created="Mon, 3 Mar 2014 03:32:44 +0000"/>
                            <attachment id="38806" name="Screenshot 2014-03-03 21.36.43.png" size="320575" author="davide.italiano" created="Tue, 4 Mar 2014 05:40:00 +0000"/>
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