Parallel Computer Architecture

30 CHAPTER 1 Introduction

Virtual address spaces for a Machine physical address space

collection of processes communicating

P

n

private

^

Common physical

addresses

P

2

private

P

1

private

P

0

private

FIGURE 1.14 Typical memory model for shared memory parallel programs. Collec-

tions of processes have a common region of physical addresses mapped into their virtual

address space, in addition to the private region, which typically contains the stack and

pri-

vate data.

Within the general framework of Figure 1.15, a great deal of evolution of shared

memory machines has taken place as the underlying technology has advanced. The

early machines were "high-end ...