Represent the processes with the functions called in these processes. The bars consist of colored rectangles labeled with the function names.
Indicate messages sent between processes. These lines connect sending and receiving processes.
Blue lines, forming a grid
Represent collective operations, such as broadcast or reduce operations.
Status bar at the bottom of the panel
Shows the entire runtime of the trace. If the mouse cursor hovers over the Event Timeline, the status bar shows information on events under the cursor.
To get a better view of events and communications between them, use zooming.