Parallel Computer Architecture

922

CHAPTER

11 Latency Tolerance

characteristics of the contexts (for example, give priority to the context that has the

fewest instructions currently in the fetch unit or the reorder buffer or to the context

that currently has the fewest outstanding cache misses). Finally, which operations

should we choose from the reorder buffer among the ones that are ready in each

cycle? The standard practice in dynamically scheduled processors is to choose the

oldest operation that is ready, but other choices, based on which threads the opera-

tions are from and how the threads are behaving, may be more appropriate in this

case.

Little or no performanc