Real-Time Fiber OCMmunications is a gigabit speed network that has been designed ofr damage tolerant local area networks. In addition to its damage tolerant characteristics, it has several features that make it attractive as a possibe interconnection technology for parallel applications in a cluster of workstatins. These characteristics include support for broadcast and multicast messaging, memory cache in the network interface card, and support for very fine grain writes to the network cache. Broadcast data is captured in network cache of all workstations in the network providing a distributed shared memory capability. In this paper, RTFC is introudced. The performance of standard MPI collective communications using TCP rotocols over RTFC are evaluated and compared experimentally with that of Fast Ethernet. It is found that the MPI message passing libraries over traditional TCP protocols over RTFC perofrm well iwth respect to fast Ethenet. Also, a new aproach that used sirect network cache movement of ubffers for collective operations is evaluated. It is found that execution time for parallel collective communicatins may be improved via effecitve use of network cache.
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