Communication displays give support in determining the frequency of communication, whether congestion in message queues or not, volume and the type of patterns being communicated etc.
A communication matrix is created for displaying the communication pattern and size of messages being sent from one processor to another, the duration of communication etc. In the communication matrix, a two dimensional array is created such that both the horizontal and vertical sides are represented with the several processors. It mainly gives the communication pattern among the processors. The rows show the processor which is sending the message and columns show the processor which is going to receive the messages as shown in Figure.