1. A method for selecting a common lowest latency protocol (LLP) for communicating between nodes of a parallel processing environment (PPE), the method implemented within a parallel processing communication accelerator (PPCA) of at least one of the nodes, comprising: determining, within the PPCA, a current topology of the parallel processing environment, the topology identifying communication protocols supported by each of the nodes; comparing the current topology against a previously determined topology to detect changes in the current topology; and processing, within the PPCA, the current topology to select the LLP common to all nodes of the parallel processing environment.