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Unformatted text preview: G EOGRAPHICALLY D ISTRIBUTED C OMPUTING : ATM over the NASA ACTS Satellite P ATRICK W. D OWD 1 , F RANK A. P ELLEGRINO , 1 T ODD M. C ARROZZI , 1 , S ARAGUR M. S RINIDHI 2 1 Dept. Electrical & Computer Engineering 2 Sterling Software/NASA Lewis Research Center State University of New York at Buffalo 21000 Brookpark Road Buffalo, NY 14260 Cleveland, Ohio 44135 Abstract – This paper outlines some of the problems and the solutionsdeveloped to support geographically distributed com- puting via ATM. In particular, applications developed with the Parallel Virtual Machine (PVM) [1] message passing library, communicating via ATM at OC3c speeds (155 Mbps) through the NASA ACTS satellite are considered. A primary goal of this work is to assess the suitability of an ATM-based network to support interprocess communication and remote file I/O sys- tems for distributed computing. This paper restricts itself to the behavior of PVM in a large propagation delay environment. Refer to [2–4] for additional detail and performance results. 1 Introduction There is interest in developing a capability of supporting ge- ographically distributed computing. This would allow more effective resource sharing and improved utilization of comput- ing resources. However, the propagation delay between two computer systems can severely hamper the achievable perfor- mance. In this paper we consider this problem, define three possible solutions to it and then illustrate the results of the solutions as implemented. We are primarily concerned with geographically dis- tributed computing, and use the NASA ACTS satellite to inves- tigate this problem. This poses a particularly extreme situation since the propagation delay is on the order of hundreds of mil- liseconds. The experimental scenario is illustrated in Figure 1, where the end points are a CRAY YMP supercomputer that is used for CFD computation, and an SGI Onyx which is used for visualization. A major issue to be examined is the use of ATM-based local-area and wide-area networks in distributed computing. In particular, a primary goal of this work is to assess the suitability This work was supported by NASA through Grant NAG3-1548. The authors can be reached through dowd,fap,carrozzi,saragur @lace.lerc.nasa.gov and would like to thank Dave Brooks of NASA/Lewis for his assistance. Preprints of this paper, and other related works, can be obtained through WWW at http://piranha.eng.buffalo.edu/ . ONYX ONYX SGI SGI SPARC 10 SUN SPARC 10 SUN Ethernet OC3c ATM OC3c HIPPI NASA ACTS Satelite BBG Fore ASX-200 OC3c- ATM- Fibre Channel- FDDI- ALLNODE- Ethernet Communication: Intra-Cluster IBM RS/6000 Inter-Cluster- Ethernet- ATM Comm CRAY YMP IBM SP/2 Figure 1: Experimental Scenario of an ATM-based network to support the interprocess commu- nication and remote file I/O system requirement of distributed computing....
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This note was uploaded on 09/13/2009 for the course EE 6345 taught by Professor Cantrell during the Spring '09 term at University of Texas at Dallas, Richardson.

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