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| </p></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a name="optimizing"></a>Chapter 20. Optimizing Jetty</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="section"><a href="optimizing.html#garbage-collection">Garbage Collection</a></span></dt><dt><span class="section"><a href="high-load.html">High Load</a></span></dt><dt><span class="section"><a href="limit-load.html">Limiting Load</a></span></dt></dl></div><p>There are many ways to optimize Jetty, which vary depending on the |
| situation. Are you trying to optimize for number of requests within a given |
| amount of time? Are you trying to optimize the serving of static content? Do |
| you have a large bit of hardware that you want to give entirely over to |
| Jetty to use to its heart's delight? Here are a few of the many different |
| ways to optimize Jetty.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="garbage-collection"></a>Garbage Collection</h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="optimizing.html#tuning-examples">Tuning Examples</a></span></dt></dl></div><p>Tuning the JVM garbage collection (GC) can greatly improve Jetty performance. Specifically, you can avoid |
| pauses while the system performs full garbage collections. Optimal tuning of the GC depends on the behaviour of the |
| application and requires detailed analysis, however there are general recommendations.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="tuning-examples"></a>Tuning Examples</h3></div></div></div><p>These options are general to the Sun JVM, and work in a JDK 6 installation. They provide good information |
| about how your JVM is running; based on that initial information, you can then tune more finely.</p><p>To print the implicit flags with which the JVM is configured:</p><div class="screenexample"><pre class="screen"> |
| |
| -XX:+PrintCommandLineFlags |
| |
| </pre></div><p>To disable explicit GC performed regularly by RMI:</p><div class="screenexample"><pre class="screen"> |
| |
| -XX:+DisableExplicitGC |
| |
| </pre></div><p>To print the date and time stamps of GC activity with details:</p><div class="screenexample"><pre class="screen"> |
| |
| -XX:+PrintGCDateStamps \ |
| -XX:+PrintGCTimeStamps \ |
| -XX:+PrintGCDetails \ |
| -XX:+PrintTenuringDistribution |
| |
| </pre></div><p>To log GC details to a file:</p><div class="screenexample"><pre class="screen"> |
| |
| -Xloggc:[path/to/gc.log] |
| |
| </pre></div><p>To print GC activity with less detail:</p><div class="screenexample"><pre class="screen"> |
| |
| -verbose:gc |
| |
| </pre></div><p>To use the concurrent marksweep GC with full GC at 80% old generation full:</p><div class="screenexample"><pre class="screen"> |
| |
| -XX:+UseConcMarkSweepGC \ |
| -XX:CMSInitiatingOccupancyFraction=80 |
| |
| </pre></div></div></div></div><script type="text/javascript"> |
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