Software Technology for Adaptable, Reliable Systems (STARS). UR20-SEE, CAIS-A Performance Study. MACH vs. UNIX.
Informal technical rept.
UNISYS DEFENSE SYSTEMS RESTON VA TACTICAL SYSTEMS DIV
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Unisys has been developing and maintaining an implementation of CAIS-A since the beginning of the STARS Prime Program. This implementation has been hosted on Sun Workstations running under SunOS Berkeley UNIX with some System V UNIX extensions. In subtask UR20.1SEE, this implementation was ported to run under MACH on Sun Work-stations. This port was done to gauge whether MACH is mature enough to be a host for the Unisys STARS SEE. A second objective was to determine whether the purported performance improvements of program execution under MACH vs. UNIX can be experimentally corroborated. In particular, MACH-specific mechanisms were to be incorporated into the MACH port of CAIS-A, exercised and measured. Specifically MACH IPC interprocess communications would be used for passing messages between CAIS-A client tools and the CAIS-A server program, replacing the use of semaphores and shared memory in the UNIX implementation of CAIS-A. This report discusses the performance measurement experiments conducted under MACH and UNIX i.e., SunOS, in which it was experimentally determined that CAIS-A performs better under MACH.
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