U
Ultrix, DECstation 5000 reboots,
F-69
Uncached state, directory-based cache coherence protocol basics,
380,
384–386
Underflow
floating-point arithmetic, J-36 to J-37, J-62
Unicasting, shared-media networks, F-24
Unified cache
AMD Opteron example,
B-15
Uniform memory access (UMA)
multicore single-chip multiprocessor,
364
Uninterruptible instruction
Uninterruptible power supply (UPS)
Uniprocessors
memory hierarchy design,
73
memory system coherency,
353,
358
multithreading
simultaneous, on superscalars,
230–232
parallel
vs. sequential programs,
405–406
processor performance trends,
3–4,
344
Unit stride addressing
GPU
vs. MIMD with Multimedia SIMD,
327
GPUs
vs. vector architectures,
310
multimedia instruction compiler support,
A-31
UNIX systems
block servers
vs. filers, D-35
floating point remainder, J-32
multiprocessor software development,
408
multiprogramming workload,
374
seek distance comparison,
D-47
vector processor history, G-26
Unshielded twisted pair (UTP), LAN history, F-99
USB, Sony PlayStation 2 Emotion Engine case study, E-15
Use bit
address translation,
B-46
segmented virtual memory,
B-52
virtual memory block replacement,
B-45
User-level communication, definition, F-8
User nonmaskable events, definition,
C-45
User-requested events, exception requirements,
C-45
Utilization
I/O system calculations, D-26
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