Parallel Computer Architecture

710 CHAPTER 9 Hardware/Software Trade-Offs

Shared

virtual

address space

Page

s

1-4-

SVM

library

// / V

Request

Local

memories

of

nodes

m

S

Invalidation

>

i

1

Request

*

v

-

x

/

.Page

FIGURE

9.10

Illustration

of

simple shared virtual memory.

At

the beginning,

no

node

has a

copy

of

the

stippled shared virtual page with which

we are

concerned. Events occur

in the

order

1, 2, 3, 4.

Read

1

incurs

a

page fault during address translation

and

fetches

a

copy

of the

page

to P

0

(presumably

from disk). Read

2,

shown

in the

same frame, incurs

a

page fault

and

fetches

a

read-only copy

to P

1

(from

P

0

).

This

is the

same virtual page

but is at two

different physica ...