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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-6331] mongoperf can&apos;t saturate drive with writes</title>
                <link>https://jira.mongodb.org/browse/SERVER-6331</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When running some tests on EC2, I was using mongoperf to evaluate disk performance. mongoperf was run with settings &lt;/p&gt;
{nThreads:16, w:true, fileSizeMB:10000}
&lt;p&gt;. Despite ramping up the number of threads (tried up to 64 threads) mongoperf could never do more than ~1100 ops / second. However, if I run multiple mongoperf processes, I was able to get the aggregate up to 5000 ops / second. Seems like 1 mongoperf instance should be able to saturate the disk. I&apos;ve attached a chart showing iops reported from iostat during the test. the &quot;steps&quot; on the left hand side show the aggregate throughput as i went from 3 -&amp;gt; 4 -&amp;gt; 5 mongo perf instances. the &quot;valleys&quot; are the time during which the new mongoperf is allocating the data file. the bulk of the graph is the performance with 5 mongo perf&apos;s running simultaneously. &lt;/p&gt;</description>
                <environment>Amazon Linux</environment>
        <key id="43569">SERVER-6331</key>
            <summary>mongoperf can&apos;t saturate drive with writes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jsr">Jared Rosoff</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Jul 2012 18:04:57 +0000</created>
                <updated>Tue, 15 Mar 2016 00:30:02 +0000</updated>
                            <resolved>Tue, 15 Mar 2016 00:30:02 +0000</resolved>
                                    <version>2.1.0</version>
                                                    <component>Tools</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1203252" author="ian@10gen.com" created="Tue, 15 Mar 2016 00:30:02 +0000"  >&lt;p&gt;Apologies for the delay in responding on this issue, but we&apos;ve decided not to proceed with any further enhancements to mongoperf in its current form - as such we&apos;re closing this as Won&apos;t Fix.  We aren&apos;t moving the existing code or removing the binary, but any changes going forward would almost certainly involve first moving the existing functionality to a newly written tool.  We made a similar decision with our other tools in 3.0.0 and have been very happy with the results.&lt;/p&gt;

&lt;p&gt;We don&apos;t have a specific timeline for this work, but you can vote on and add yourself as a watcher to &lt;a href=&quot;https://jira.mongodb.org/browse/TOOLS-1103&quot; title=&quot;Mongoperf replacement&quot; class=&quot;issue-link&quot; data-issue-key=&quot;TOOLS-1103&quot;&gt;&lt;del&gt;TOOLS-1103&lt;/del&gt;&lt;/a&gt; to be informed of updates as we weigh its priority against other projects that our Tools team are working on.&lt;/p&gt;</comment>
                            <comment id="487082" author="brennan" created="Fri, 24 Jan 2014 06:47:00 +0000"  >&lt;p&gt;I found the same issue on a CentOS 6.3 physical host, even running 1 mongoperf instance with a ridiculous number of threads (15k) I could only push 22MB/sec.  Once I spun up multi instances of mongoperf with separate large datafiles, I could push past 400MB/sec on our SSD array.&lt;/p&gt;</comment>
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                    <attachments>
                            <attachment id="17962" name="mongoperf.png" size="214549" author="jsr" created="Fri, 6 Jul 2012 18:04:57 +0000"/>
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