Which placement group type in AWS maximizes network performance?

The placement group type that maximizes network performance in AWS is the cluster placement group. Cluster placement groups are designed to place instances close together within a single Availability Zone, which enables low-latency network communication and high-bandwidth performance between instances. This configuration is particularly beneficial for applications that require high throughput and low latency, such as high-performance computing (HPC), machine learning workloads, and big data analytics.

By utilizing the cluster placement group, AWS can leverage the underlying physical network infrastructure to ensure that instances can communicate with each other rapidly and promptly. The arrangement minimizes network hops and maximizes both network bandwidth and the performance of workloads that require significant inter-instance communications.

In contrast, the spread and partition placement groups have different objectives. The spread placement group is designed to spread instances across distinct underlying hardware to reduce the risk of correlated failures, while partition placement groups help to segregate instances into different partitions to ensure that large-scale applications can achieve high availability and resilience. However, neither is focused on maximizing network performance to the same extent as cluster placement groups. Elastic is not a recognized placement group type within AWS.