Visualization, Debugging, and Performance in Pvm

PVM has grown to become the de facto standard for distributed computing around the world. With the increasing numbers of users and applications utilizing the PVM environment, it becomes more important to have debugging and performance tuning tools that work with PVM. This paper describes our most recent developments in these two areas. For PVM debugging we have created a standard interface that allows existing parallel debuggers to attach to and debug PVM applications. For performance tuning we have created the XPVM graphical user interface which displays both real-time and post-mortem animations of message traac and machine utilization by PVM applications. We also present our latest research into improving the performance of PVM.