Extended Node ID (XNID)

An extended node ID (XNID) provides a means of addressing host nodes and their coprocessors independently even though a host and coprocessor share the same network interface. An XNID provides a handle for common communication interfaces within the system, such as PMI, LNET, TCP/IP, and DVS, to access coprocessors. This direct access permits direct (autonomous) execution of coprocessor-targeted executables.

During the installation of a system with coprocessors, the CLE installer prompts for a base extended node identifier offset value for the system. For example, assume that base is set to 50000. That number is added to the host NID for a node containing a coprocessor. If the host node is nid00032, then the coprocessor is nid50032.