Parallel Computer Architecture

6.5 Case

Studies:

SGI Challenge and Sun Enterprise 6000 425

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-m-

-A-

—*—

-·—

-O-

——

—A—

-D-

-+-

8M

4M

2M

1 M

512

K

256

K

128 K

64

K

32

K

16K

·-·

16

64 256

1 K 4K

Stride (bytes)

16K 64

K

256

K

1 M 4M

FIGURE 6.17 Read microbenchmark results for the SGI Challenge. Each curve is for an array of

the size shown in the legend. The datapoints for array sizes 32 K to 256 K are so similar that they

can-

not be easily distinguished.

lenge Powerpath-2 bus, the bus can support up to 112 outstanding transactions,

including up to 7 from each board, so it is designed for devices that can sustain mul-

tiple outstanding transactions, such as lockup-fre ...