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F is application
dependent. For lattice
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calculations it
is around 1.
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When B/F
>> P, P determines the performance.
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When B/F <<
P, maximum sustained
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performance is
B/F independent of P!
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Example: For Xeon
with 400 Mhz FSB,
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maximum B is 3.2
GB/s. If F =2, B/F is 1.6
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GFLOPs. Even if
it is a 8 Ghz CPU, this is all
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that one can get!
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