Abstract
This paper presents a methodology for accurately measuring system
call service times and process blocking times in a UNIX-like computing
environment. Problems that may cause inaccurate measurements stem from
the method used to charge processes for execution time, the difference
in the time consumed during a system call and a time quantum or dispatch
interval, and the instrumentation overhead included in the measurement
program. The collected measurements for each system call are used to
form a distribution from which process blocking times can be drawn or
for which the mean can be used as the process blocking time
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