Management of Process-to-Process Intra-Cluster Communication Requests

An apparatus, comprising:

• a processor;
• and
• a memory coupled to the processor, wherein the memory comprises instructions which, when executed by the processor, cause the processor to:
• receive, from a first application, a call in a first operating system in a first data processing system of a plurality of data processing systems;
• pass, by the first operating system, the call from the first operating system to a first host fabric interface controller in the first data processing system without processing the call;
• process, by the first host fabric interface controller, the call to determine a second data processing system in the plurality of data processing systems with which the call is associated, wherein the call is processed by the first host fabric interface controller without intervention by the first operating system;
• initiate, by the first host fabric interface controller, an intra-cluster connection to a second host fabric interface controller in the second data processing system via a set of host fabric interfaces, a set of integrated switch/routers, and a plurality of intra-cluster buses;
• and
• transfer, by the first host fabric interface controller, the call to the second host fabric interface controller in the second data processing system via the intra-cluster connection.

A computer program product comprising a computer recordable medium having a computer readable program recorded thereon, wherein the computer readable program, when executed on a computing device, causes the computing device to:

• receive, from a first application, a call in a first operating system in a first data processing system of a plurality of data processing systems;
• pass, by the first operating system, the call from the first operating system to a first host fabric interface controller in the first data processing system without processing the call;
• process, by the first host fabric interface controller, the call to determine a second data processing system in the plurality of data processing systems with which the call is associated, wherein the call is processed by the first host fabric interface controller without intervention by the first operating system;
• initiate, by the first host fabric interface controller, an intra-cluster connection to a second host fabric interface controller in the second data processing system via a set of host fabric interfaces, a set of integrated switch/routers, and a plurality of intra-cluster buses;
• and
• transfer, by the first host fabric interface controller, the call to the second host fabric interface controller in the second data processing system via the intra-cluster connection.