 <p><a href="http://www.eclipse.org/mat/" rel="nofollow" title="Eclipse Memory Analyzer Home">Eclipse Memory Analyzer</a> is an excellent tool for analyzing the core*.dmp (and portable heap dumps, i.e. .phd files, too). To read those Websphere Dumps an additional plugin called <a href="http://www.ibm.com/developerworks/java/jdk/tools/dtfj.html" rel="nofollow" title="IBM Diagnostic Tool Framework for Java">IBM Diagnostic Tool Framework for Java</a> needs to be installed (<a href="http://public.dhe.ibm.com/ibmdl/export/pub/software/websphere/runtimes/tools/dtfj/" rel="nofollow" title="Plugin Update Site">Update Site</a>).</p> <p>Before even trying to open big dumps remember to increase the tool's heap size by modifying the <code>MemoryAnalyzer.ini</code> and adding/modifying the line</p> <p><code>-Xmx4096m</code></p> <p>Adjust this number to your needs.</p>