July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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364 CHAPTER 7 Multiprocessors
P1
P2
P3
P4
Flow of control
S
A1
FIGURE 7.9
Evaluating system speedup in a single-threaded implementation.
Flow of control
P2
A1
P3
P4
P1
FIGURE 7.10
Evaluating system speedup in a multithreaded implementation.
much overhead is incurred getting data into and out of the accelerator, we won’t
see much speedup.
7.3.2 Performance Effects of Scheduling and Allocation
When we design a multiprocessor system, we must allocate tasks to PEs; we must
also schedule both the computations on the PEs and schedule the communication
between the processes on the buses in the system.The next example considers the
interaction between scheduling and allocation ...