Which file should I look at to analyze the communication model code?

I have been requested by my esteemed graduate advisor to conduct an analysis of the communication model employed in the prestigious graph computing platform. Specifically, I am tasked with examining the buffer size, communication frequency, and data size involved in the execution of graph algorithms. As a novice in this field, having recently completed my undergraduate studies in mathematics, I must admit my limited experience in this particular domain. Hence, I humbly seek your guidance and expertise in assisting me with this endeavor.