Architecture and functionality of the collective operations subnet of the Angara interconnect

The Angara interconnect developed by JSC "NICEVT" is designed to connect the nodes of supercomputers and computing clusters. The paper describes the main architectural solutions, algorithms and functionality of the collective operations subnet of the Angara interconnect and presents the forecast of its characteristics based on the simulation modeling and actual operation. The proposed solutions allow bringing the time complexity of the collective operations execution to the theoretical limit for the kD-torus topology network.