Parallel Computer Architecture

6.8 Exercises 451

6.17 Assume a system bus similar to the Powerpath-2 discussed in Section 6.5. Assum-

ing 200-MIPS/200-MFLOPS processors with 1-MB caches and 64-byte cache blocks,

for each of the applications in Table 5.1, compute the bus bandwidth when using

a. the Illinois MESI protocol

b.

the Dragon protocol

c. the Illinois MESI protocol, assuming 256-byte cache blocks

For each of parts, (a), (b), and (c) compute the utilization of the address+

command bus separately from the utilization of the data bus. State all assump-

tions clearly.

d. Complete parts (a) and (b) for a single SparcCenter XDBus, which has 64-bit-

wide multiplexed addres