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Randomness, 118
Random variables, 149-50
binominal, 165
continuous, 150
covariance of, 160
defined, 149
discrete, 149-50
expectation, 155-63
exponential, 176
jointly distributed, 150, 161
marginal distributions of, 152
percentile of, 212
standard deviation, 159
uncorrelated, 160
variance, 159
Reachability graphs, 289-90
Reachability sets, 288-89
determining, 289
with initial marking, 289
null marking and, 288
See also Petri nets
Recovery manager, 96
Reduced instruction set computer (RISC), 6, 47
Registers, 42-43, 63
defined, 42
illustrated, 43
instruction, 44
See also CPU
Relational database systems, 14-15
ACID properties, 14
defined, 14
See also Database systems
Relative frequency definition, 145
Reliability, 341
Remote procedure call policies, 81-82
Resources
in equilibrium, 135
management, 72
throughput, 136
utilization, 341
Response time, 116-17, 337-39
defined, 116, 338
load and, 338
measurements, 338
system load vs., 117
See also Performance measures
Reversibility, 293
Ring topology, 58-59
Round-robin scheduling, 133-34, 135
Routing, 80
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