In the Event Timeline, you see the tagged functions in a frame and with their function labels in bold. The lines of the tagged messages and collective operations are thicker.
When you filter the Event Timeline for a particular process, you see only the MPI functions of this process, since only they pass the filter and all the other functions and processes are filtered out.
Tagging Functions in Process 8 in the Event Timeline:
Filtering Functions in Process 8 in the Event Timeline:
