what is a flop

Mikhail Kuzminsky kus at free.net
Mon Jul 23 12:44:16 EDT 2012


According to Roberto Ammendola
> The "Floating point operations per clock cycle" depends on the 
> processor, obviously, and on which instructions you use in your code. 
> For example in a processor with the SSE instruction set you can perform 
> 4 operations (on 32 bit register each) per clock cycle. One processor 
> (Xeon or P4) running at 2.0 GHz can reach 8 GigaFlops.
  Taking into account that throughput of FMUL and FADD units in
P4/Xeon is 2 cycles, i.e. FP result may be received on any 2nd sycle
only, the peak Performance of P4/2 Ghz must be 4 GFLOPS.

Mikhail Kuzminsky
Zelinsky Institute of Organic Chemistry
Moscow

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