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<article class="doc">
<h1 class="page">Distributed James Server benchmark</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>This document provides benchmark methodology and basic performance of Distributed James as a basis for a James administrator who
can test and evaluate if his Distributed James is performing well.</p>
</div>
<div class="paragraph">
<p>It includes:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>A sample Distributed James deployment topology</p>
</li>
<li>
<p>Propose benchmark methodology</p>
</li>
<li>
<p>Sample performance results</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>This aims to help operators quickly identify performance issues.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_sample_deployment_topology"><a class="anchor" href="#_sample_deployment_topology"></a>Sample deployment topology</h2>
<div class="sectionbody">
<div class="paragraph">
<p>We deploy a sample topology of Distributed James with these following components:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Distributed James: 3 Kubernetes pods, each pod has 2 OVH vCore CPU and 4 GB memory limit.</p>
</li>
<li>
<p>Apache Cassandra 4 as main database: 3 nodes, each node has 8 OVH vCores CPU and 30 GB memory limit (OVH b2-30 instance).</p>
</li>
<li>
<p>OpenDistro 1.13.1 as search engine: 3 nodes, each node has 8 OVH vCores CPU and 30 GB memory limit (OVH b2-30 instance).</p>
</li>
<li>
<p>RabbitMQ 3.8.17 as message queue: 3 Kubernetes pods, each pod has 0.6 OVH vCore CPU and 2 GB memory limit.</p>
</li>
<li>
<p>OVH Swift S3 as an object storage</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_benchmark_methodology_and_base_performance"><a class="anchor" href="#_benchmark_methodology_and_base_performance"></a>Benchmark methodology and base performance</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_provision_testing_data"><a class="anchor" href="#_provision_testing_data"></a>Provision testing data</h3>
<div class="paragraph">
<p>Before doing the performance test, you should make sure you have a Distributed James up and running with some provisioned testing
data so that it is representative of reality.</p>
</div>
<div class="paragraph">
<p>Please follow these steps to provision testing data:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Prepare James with a custom <code>mailetcontainer.xml</code> having Random storing mailet. This help us easily setting a good amount of
provisioned emails.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Add this under transport processor</p>
</div>
<div class="listingblock">
<div class="content">
<pre>&lt;mailet match="All" class="RandomStoring"/&gt;</pre>
</div>
</div>
<div class="ulist">
<ul>
<li>
<p>Modify <a href="https://github.com/apache/james-project/tree/master/server/apps/distributed-app/docs/modules/ROOT/pages/benchmark/provision.sh">provision.sh</a>
upon your need (number of users, mailboxes, emails to be provisioned).</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Currently, this script provisions 10 users, 15 mailboxes and hundreds of emails for example. Normally to make the performance test representative, you
should provision thousands of users, thousands of mailboxes and millions of emails.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Add the permission to execute the script:</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre>chmod +x provision.sh</pre>
</div>
</div>
<div class="ulist">
<ul>
<li>
<p>Install postfix (to get the smtp-source command):</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre>sudo apt-get install postfix</pre>
</div>
</div>
<div class="ulist">
<ul>
<li>
<p>Run the provision script:</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre>./provision.sh</pre>
</div>
</div>
<div class="paragraph">
<p>After provisioning once, you should remove the Random storing mailet and move on to performance testing phase.</p>
</div>
</div>
<div class="sect2">
<h3 id="_provide_performance_testing_method"><a class="anchor" href="#_provide_performance_testing_method"></a>Provide performance testing method</h3>
<div class="paragraph">
<p>We introduce the tailored <a href="https://github.com/linagora/james-gatling">James Gatling</a> which bases on <a href="https://gatling.io/">Gatling - Load testing framework</a>
for performance testing against IMAP/JMAP servers. Other testing method is welcome as long as you feel it is appropriate.</p>
</div>
<div class="paragraph">
<p>Here are steps to do performance testing with James Gatling:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Setup James Gatling with <code>sbt</code> build tool</p>
</li>
<li>
<p>Configure the <code>Configuration.scala</code> to point to your Distributed James IMAP/JMAP server(s). For more configuration details, please read
<a href="https://github.com/linagora/james-gatling#readme">James Gatling Readme</a>.</p>
</li>
<li>
<p>Run the performance testing simulation:</p>
</li>
</ul>
</div>
<div class="listingblock">
<div class="content">
<pre>$ sbt
&gt; gatling:testOnly SIMULATION_FQDN</pre>
</div>
</div>
<div class="paragraph">
<p>In there: <code>SIMULATION_FQDN</code> is fully qualified class name of a performance test simulation.</p>
</div>
<div class="paragraph">
<p>We did provide a lot of simulations in <code>org.apache.james.gatling.simulation</code> path. You can have a look and choose the suitable simulation.
<code>sbt gatling:testOnly org.apache.james.gatling.simulation.imap.PlatformValidationSimulation</code> is a good starting point. Or you can even customize your simulation also!</p>
</div>
<div class="paragraph">
<p>Some symbolic simulations we often use:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>IMAP: <code>org.apache.james.gatling.simulation.imap.PlatformValidationSimulation</code></p>
</li>
<li>
<p>JMAP rfc8621: <code>org.apache.james.gatling.simulation.jmap.rfc8621.PushPlatformValidationSimulation</code></p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_base_performance_result"><a class="anchor" href="#_base_performance_result"></a>Base performance result</h3>
<div class="paragraph">
<p>A sample IMAP performance testing result (PlatformValidationSimulation):</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../_images/james-imap-base-performance.png" alt="james imap base performance">
</div>
</div>
<div class="paragraph">
<p>If you get a IMAP performance far below this base performance, you should consider investigating for performance issues.</p>
</div>
</div>
</div>
</div>
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