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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><mailet match="All" class="RandomStoring"/></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 |
| > 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> |
| </article> |
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