Topo Address Info【免费下载链接】hcommHCOMMHuawei Communication是HCCL的通信基础库提供通信域以及通信资源的管理能力。项目地址: https://gitcode.com/cann/hcommIntroductionIn the Ascend 950 chip generation, the hyperplane uses the Unified Bus for networking. Multiple different topology networking methods are used across different product forms. This module is used to discover the endpoint addresses of each edge under different topologies.Networking IntroductionTwo main types of networking are used: MESH and CLOS. For related information, refer to the paper: https://arxiv.org/abs/2503.20377MESH NetworkingEach NPU has a direct physical link to every other NPU, so there is a pair of independent communication addresses. For example, if there are 8 NPUs on the same NPU board, there are 8 * 7 / 2 28 physical paths, that is, 28 pairs of communication addresses.CLOS NetworkingAny two NPUs communicate through a switch chip. Therefore, one NPU requires one address. In common networking scenarios, due to reliability and other reasons, CLOS networking can usually be divided into multiple planes, with each plane corresponding to one address. For example, in a liquid-cooled POD, NPUs use two independent logical ports to connect to two separate network planes.Networking PlanningNetwork Layer DescriptionIn the 950 chip generation, the network is divided into multiple layers based on communication quality and range.Network LayerDescription0Highest communication quality and lowest latency. Mostly MESH networking, mainly the fullmesh network within the same NPU board and the box-level network in POD form.1Second-highest communication quality and medium latency. CLOS networking with a larger communication range, at the super node level, still within the scale-up range.2Lowest communication quality. CLOS networking with the entire cluster as the communication range. Mainly scale-out networks such as ROCE or UBOE.Network Address DescriptionNetwork LayerDescription0Because MESH networking is the primary method, there are multiple pairs of communication addresses. In topo_addr_info, this is expressed as the address of each port on each NPU. The address type is EID.1Fill in the address based on the networking plane. In multi-plane networking, the number of addresses is the same as the number of planes. Traffic is distributed among different planes during collective communication. The address type is EID.2The address planning is the same as layer 1. The address type is IP address.【免费下载链接】hcommHCOMMHuawei Communication是HCCL的通信基础库提供通信域以及通信资源的管理能力。项目地址: https://gitcode.com/cann/hcomm创作声明：本文部分内容由AI辅助生成（AIGC），仅供参考