1. A method of graphically displaying trace data using a visualization tool having a display monitor for displaying pixel map diagrams, a mass storage device for storing data structures and diagrams, a parallel computer system connected to said display monitor and mass storage device, and an input device connected to said computer system, comprising the steps of: converting trace data into data structures and creating pixel map diagrams from each of said data structures; sampling processor utilization time at certain intervals from said trace data; generating and displaying an activity diagram for any selected processor in said computer system at each of said sampled time intervals; generating an average processor utility diagram and plotting it against said processor activity diagram over time so as to compare each processors utilization time to said average utilization time, highlighting any processor that is functioning above and below such average.