Issue link: https://read.uberflip.com/i/1187300
Amazon Web Services – HPC Lens AWS Well-Architected Framework Page 37 all. However, for large tightly coupled workloads, multiple instances are required with low latency between the instances. On AWS, this is achieved by launching compute nodes into a cluster placement group, which is a logical grouping of instances within an Availability Zone. A cluster placement group provides non-blocking and non-oversubscribed connectivity, including full bi- section bandwidth between instances. Cluster placement groups are recommended for tightly coupled applications and can be created through the AWS Management Console, CLI, or API. HTC cases are generally not sensitive to very low latency networking and typically do not require the use of a placement group or the need to keep instances in the same Availability Zone or Region. For maximum flexibility, cluster placement groups should not be used unless your application requires consistent, low latency networking between compute instances. The best network performance may be obtained with the largest instance type in a family. Please refer to the instance type matrix for details. For optimal network performance, you should select an instance type that supports enhanced networking. Enhanced networking provides EC2 instances with higher networking performance and lower CPU utilization through the use of pass-through rather than hardware-emulated devices. This method allows EC2 instances to achieve higher bandwidth, higher packet-per-second processing, and lower inter-instance latency compared to traditional device virtualization. Enhanced networking is recommended for HPC applications and is available on all current-generation instance types, with the exception of the T2 instance family. Enhanced networking requires an AMI with supported drivers. Although most current AMIs contain supported drivers, custom AMIs may require updated drivers. For more information on enabling enhanced networking and instance support, see the enhanced networking documentation. 11 The following example question focuses on network considerations for performance efficiency: HPCPERF 5: How do you select your network solution?