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Rpeak is a theoretical peak performance. It is determined by counting the number of floating-point additions and multiplications (in full precision) that can be completed during a period of time, usually the cycle time of the machine. For example, an Intel Itanium 2 at 1.5 GHz can complete 4 floating point operations per cycle or a theoretical peak performance of 6 GFlop/s.
In the Top500 table Rmax is a maximum performance of a computer (measured in Gflop/s) achieved in the HPL benchmark. All computers in a list are ordered first by their Rmax value.
