rather unfortunate article on Mac
Richard Walsh
rbw at networkcs.com
Fri Feb 1 07:17:03 PST 2002
Bari Ari wrote:
> We looked at building some very dense clusters using the G4s. The
> floating point performance is great (15Gflops peak) as well as the raw
> performance vs. power consumption (21watts at 1GHz). The main drawbacks are
> price of the CPUs (though the new 7455s are only $125/10k for the 800MHz
> versions), lack of support from Motorola and lack of any decent
> clustering software such as Scyld.
Are those 32-bit or 64-bit flops for the peak calculation? I see 4
vector FMA's and 1 standalone (can it chain mult and add?), so I
guess it could be 15 64-bit gflops at 1.5 GHz cycle time. That would
be:
(4 + 1) * 2 * 1.5 = 15 gflops
Is this the correct calculation?
Regards,
rbw
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