Moving AWS Lambda functions with Golang to Graviton chips

AWS Lambda allows you to configure new and existing functions to run on Arm-based AWS Graviton2 processors in addition to x86-based functions.

On top, with this choice you can save money in two ways. First, your functions run more efficiently due to the Graviton2 architecture. Second, you pay less for the time that they run. In fact, Lambda functions powered by Graviton2 are designed to deliver up to 19 percent better performance at 20 percent lower cost.

But what is the high-level architecture exactly?

Every vCPU is a physical core and this offers better scalability. It offers more cache on per CPU-basis, and as depicted above, it means that there’s no simultaneous multi-threading (SMT) with more isolation between vCPUs. By contrast, every vCPU on a 5th generation instance type with Intel chips, is a hyper-thread. Having large L1 and L2 caches for every vCPU means that most of the times, a large portion of your workload will fit in cache, without the extra roundtrip in memory.

Gravitons are also implemented using a single socket with a flat memory hierarchy and with a…