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HI,

i have been evaluating FFT of MKL.while computing , FFT takes approx. 1 milisecond which is too high.

i'm using following part of code to measure time of fft computation.

s_initial=dsecnd();

fft computation;

s_elapsed=dsecnd()-s_initial;

printf("time in milisec=%f",s_elapsed*1000);

can any one tell me how to reduce time compuation time gurther.

i'm using intel processor.

Thanks,

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rakesh wrote:

Hi,

earlier i was calculating for only one iteration once i increased the no of iteration from one to 100 the calculation time reduced in the order of microsecond. now i get computation time around 0.02 ms(approx) for 1024 pt complex FFT.

While measuring time needed to complete 4096 sine values FFT routine I got ~121245 nanoseconds i.e 121 microseconds.Compiler intrinsic __rdtsc() was used and averaged.I hope that time interval needed to complete the FFT calculation was not influenced by the rdtsc latency which is thousand times slower.

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