If you've ever deployed memory-bound workloads on AWS Graviton, you know that CPU compute speed is only part of the story. Another factor in real-world performance is how efficiently your code accesses the memory subsystem, specifically the cache hierarchy, interconnects, and physical DRAM. In this article, I will walk through how to use the Arm System Characterization Tool (ASCT) to analyze the memory subsystem of AWS Graviton2 ( c6g ) and Graviton4 ( c8g ) instances. You will learn how to expl