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Page 504 Table 7.10 Some comparative results for FFT application. Sample Size N, number of Iterations R3000 Cycles per Iteration CRAY 2 Cycles per Iteration 256 1024 53 49 512 2304 53 45 1K 5120 53 40 2K 11,264 56 36 4K 24,576 92 34 8K 53,248 99 35 16K 114,688 120 34 32K 245,760 120 32 *CRAY 2 has n1/2 = 60, Dt = 4.1 ns, R¥ = 244 Mflop. Figure 7.56 Vector processor and pipelined processor performance. Based on cycle count (not time). T1 is the cycle count for the 256-point FFT for the MIPS R3000; Tp is the corresponding cycle count for various FFT sample sizes for either MIPS R3000 or the Cray-2. Sp = T1/Tp.
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