The CLAM Approach to Multithreaded Communication on Shared-Memory Multiprocessors: Design and Experiments

The Connectionless, Lightweight, and Multiway (CLAM) communications environment provides efficient and scalable multi-protocol support for distributed applications using mullimodal data. 1bis paper presents motivation and design decisions behind the CLAM system, along with two simple but effective scheduling algorithms for the simultaneous support of multiple, threads-based user-space protocols. One algorithm is readily portable La shared~memory multiprocessors, and enables two or more protocols to coexist within a process's space. We present experimental results on the performance of both algorithms. To demonstrate Lhe utility of the approach in a typical application, we present the results of an experiment in which one algorithm is used to implement a Distributed Interactive Simulation (DIS) application. The performance of this implementation is compared to the standard UDP-based implementation of DIS for the gi yen application. .. Supponed in part by ONR-93I0233, ARO-93G0045 and BMDO-34798-MA.