The Eclipse Memory Analyzer Tool (MAT) is an open-source Eclipse project for analyzing heap dumps and identifying memory leaks from Java virtual machines. The basic MAT installation only works with Sun HPROF binary dumps. Using the IBM Diagnostic Tool Framework for Java (DTFJ) enables MAT to work with system dumps and Portable Heap Dump (PHD) files from IBM Virtual Machines for Java version 6, version 5.0 and version 1.4.2.
If you are running on an ISA Workbench supported platform you should use the IBM Monitoring and Diagnostic Tools for Java - Memory Analyzer which extends Eclipse MAT using DTFJ.
Otherwise follow the guidelines in the Eclipse wiki to enable MAT to work with System Dumps and Heap Dumps from IBM Virtual Machines.