Parallel Computer Architecture

1.3 Fundamental Design Issues 57

whereas a shared address model must specify aspects of how processes see the order

of operations performed by other processes. Ordering issues are important and

rather subtle. Many of the tricks that we play for performance in the uniprocessor

context involve relaxing the order assumed by the programmer to gain performance,

either through parallelism or improved locality or both. Exploiting parallelism and

locality is even more important in the multiprocessor case. Thus, we need to under-

stand what new tricks can be played. We also need to examine which of the old

tricks are still valid. Can we perform the traditiona ...