Computer Systems Performance Evaluation and Prediction

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