MPIJ communication uses native marshaling of primitive Java types. On Win32 platforms this technique allows MPIJ to achieve communication speeds comparable to, and in some instances exceeding, native MPI implementations . Our performance evaluation experiments show that Java communication speed would be greatly increased if native marshaling were a core Java function.
A key feature of a pure Java MPI-like implementation is the ability to function on applet-based nodes. In MPIJ, this provides a flexible method for creating clusters of workstations without the need to install any system or user software related to the message-passing environment on the participating nodes.