A unique color identifies each type of event. A processor occupies a row in the grid, which is divided into sub-rows for each event type. The trace view illustrates many aspects of a parallel computation. The relative amounts of communication and computation is evident from the density of the display. Different phases of a program can be distinguished by their communication activity, event type, or involvement of particular processors.
Repetitive waves indicate periodic behavior usually associated with a parallel loop in the program.
At low levels of magnification, repetitive waves appear as horizontal stripes. Alternating sequences of events across different processors usually indicate correlated behavior between these processors. The color selector to the left of the grid displays all event types and allows events to be selectively enabled or disabled. Processors can also be enabled, disabled, or removed from the display. The trace view also provides several ways to filter, focus, and move through time.