...Elastic Fabric Adapter (EFA) is a network interface for Amazon EC2 instances that enables customers to run applications requiring high levels of inter-node communications at scale on AWS. Its custom-built operating system (OS) bypass hardware interface enhances the performance of inter-instance communications, which is critical to scaling these applications. With EFA, High Performance Computing (HPC) applications using the Message Passing Interface (MPI) and Machine Learning (ML) applications using NVIDIA Collective Communications Library (NCCL) can scale to thousands of CPUs or GPUs. ...
OpenGL apps running inside a VM use VMGL to obtain graphics hardware acceleration. VMGL supports VMware, Xen PV and HVM, qemu, and KVM VMs; X11-based OS such as Linux, FreeBSD and OpenSolaris; and ATI, Nvidia and Intel GPUs.