By J.J. Dongarra, G.R. Joubert, L. Grandinetti and J. Kowalik (Eds.)
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Extra info for High Performance Computing: Technology, Methods and Applications
The third critical factor is the ability of the supercomputer to output data fast enough, which depends on its architecture and on design characteristics of its I / O sub-system. As shown in Figure 1 the ATM Trial Network provided an alternate internet environment. This ATM-based internet was utilized to provide very fast internet access b e t w e e n the University of C o l o r a d o and N O A A s u p e r c o m p u t e r s and the NCAR MSS. Unfortunately realities of the MSS interface to the network have shown that ATM data rates are not currently of great benefit for direct MSS access.
The paraUelizable portion of the application may not be evenly distributed among all available processors. Communication, input/output and system overhead for process synchronization and sharing of partial results during execution can become significant and degrade performance with a large number of processors. If we assume that the worker processors of a parallel system cannot compute, communicate or perform input/output simultaneously, then Tp, the total time to execute a parallel application can be written as: Tp=tp+ t,+to (1) where tp is the time needed to execute the parallel portion of the application, t.
Kowalik and L. Grandinetti), NATO ASI Series, Series F: Computer and Systems Sciences, Vol. 106, 3-33, 1993. 7. A. Y. Grama, A. Gupta, and V. Kumar, Isoefficiency: Measuring the Scalability of Parallel Algorithms and Architectures, IEEE Parallel & Distributed Technology, 12-21, August 1993. 8. R. Hockney and M. Berry, Public International Benchmarks for Parallel Computers, Scientific Programming, 3, 2, 101-146, 1994. J. Dongarra, L. R. Joubert and J. V. All rights reserved. 49 Architectural Features Affecting Total Scalability of Parallel Systems" J.
High Performance Computing: Technology, Methods and Applications by J.J. Dongarra, G.R. Joubert, L. Grandinetti and J. Kowalik (Eds.)