Amazon EC2 instance topology
Describing your instance topology provides a hierarchical view of the relative proximity between instances. You can use this information to manage high performance computing (HPC) and machine learning (ML) compute infrastructure at scale, while optimizing job placement. HPC and ML jobs are sensitive to latency and throughput. You can use the instance topology to detect the location of your instances, and then use this information to optimize HPC and ML jobs by running them on instances that are physically closer to each other.
You can use instance topology to detect the location of your existing instances, but you can't use it to choose to launch a new instance physically close to an existing instance. To influence instance placement, you can use Capacity Reservations in cluster placement groups.
Pricing
There is no additional cost to describe your instance topology.
