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Comments on 'Measurement of Ada Overhead in OSI-Style Communications Systems'
December 1990 (vol. 16 no. 12)
pp. 1435-1439

The commenter disagrees with the comparison method used and questions the usefulness of the results obtained in the above named work by N.R. Howes and A.C. Weaver. It is claimed that the comparison method is weak because Howes and Weaver did not take into account: the impact of control flow within a protocol, the coordination required between multiple entities executing within a layer and which share the services of a lower layer, and optimizations of R.J.A. Buhr's architecture (1984) which would have improved its performance efficiency.

[1] R. J. A. Buhr,System Design with Ada. Englewood Cliffs, NJ: Prentice-Hall, 1984.
[2] W. M. Gentleman, "Message passing between sequential processes: The reply primitive and the administrator concept,"Software--Practice and Experience, vol. 11, pp. 435-466, 1981.
[3] W. M. Gentleman, "Using the Harmony operating system," Division Elec. Eng., National Research Council of Canada, Ottawa, Ont., Tech. Rep. NRCC- 87-27469, Mar. 1987.
[4] N. R. Howes and A. C. Weaver, "Measurements of Ada overhead in OSI-style communications systems,"IEEE Trans. Software Eng., vol. 15, no. 12, pp. 1507-1517, 1989.
[5] Open Systems Interconnection--Basic Connection-Oriented Session Service, International Organization for Standardization, ISO 8326, Mar. 1983.
[6] Open Systems Interconnection--Connection-Oriented Transport Service, International Organization for Standardization, ISO 8072, Sept. 1983.
[7] W. Stallings,Handbook of Computer-Communications Standards. New York: Macmillan, 1987.
[8] Verdix Ada VADS 6.0 Programmer's Guide, Verdix Corp., Chantilly, VA, 1990.
[9] C. M. Woodside and G. Franks, "A comparison of some software architectures for parallel execution of protocols," Dep. Syst. Comput. Eng., Carleton Univ., Ottawa, Ont., Canada, Tech. Rep. SCE-89-21, Aug. 1989.

Index Terms:
Ada overhead; OSI-style communications systems; comparison method; control flow; protocol; coordination required; multiple entities; lower layer; optimizations; performance efficiency; Ada; computer communications software; open systems; programming; protocols; standards
G.M. Karam, "Comments on 'Measurement of Ada Overhead in OSI-Style Communications Systems'," IEEE Transactions on Software Engineering, vol. 16, no. 12, pp. 1435-1439, Dec. 1990, doi:10.1109/32.62440
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