Distributed simulation applications often rely on middleware to provide services to support their execution over distributed computing environments. Such middleware spans many levels, ranging from low-level support for data transmission through object request brokers to higher level, simulation specific functionality such as time management. We discuss design alternatives for realizing such middleware for hard real-time (HRT) distributed simulations such as hardware-in-theloop applications. An implementation of a real-time runtime infrastructure (RTI) middleware is described, and its performance compared against a non-real-time implementation. The context for this work is the High Level Architecture standard that has been defined by the U.S. Department of Defense. 1.

ABSTRACT: The DoD is pursuing an end-to-end, seamless, network-centric (ground-based, air-based, and satellite-based), traffic types (data, voice, video, and multimedia) , delivery methods (unicast and multicast), offered traffic loads (kilobits/sec through megabits/sec), and numbers of nodes (from 10s to 1000s). The complexity exhibited by tactical edge applications typically demands the use of Modeling and Simulation (M&S) techniques, supported by high-fidelity models, to adequately quantify achievable performance on an end-to-end basis. However, these high-fidelity models often have very long runtimes, and restrictive limitations on scenario sizing. We investigate the application of the DoD High Level Architecture (HLA) and High Performance Computing (HPC) platforms to address the performance demands associated with analyzing tactical edge applications. A federation comprised of two Soldier Radio Waveform (SRW) federates and one Wireless Network after Next (WNaN) federate is developed and executed within an HPC environment at Aberdeen Proving Grounds (APG

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