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Use armpl(22.0) to calculate fft, but fftwh(fp16) is slow than fftwf(fp32) in kunpeng920 arm server, I expect fftwh is faster 2x than fftwf

yan.wei

code:

static void fftwf_armpl_fp32(fftwf_complex* signal, int row, int col) {
fftwf_plan plan_f = fftwf_plan_dft_2d(col, row, signal, signal, FFTW_FORWARD, FFTW_ESTIMATE);
fftwf_execute(plan_f);
fftwf_destroy_plan(plan_f);
}

static void fftwf_armpl_fp16(fftwh_complex* signal, int row, int col) {
fftwh_plan plan_h = fftwh_plan_dft_2d(col, row, signal, signal, FFTW_FORWARD, FFTW_ESTIMATE);
fftwh_execute(plan_h);
fftwh_destroy_plan(plan_h);
}

size

FP32(ms)

FP16(ms)

256*256

4.45

3.09

512*512

16.4

12.7

1024*1024

35.7

36.0

2048*2048

180.1

169.1

4096*4096

761.5

861.4
Parents
  • 0 Arm Employee Badge in reply to yan.wei

    Hi.

    Thanks for confirming.  We can observe a similar lack of extra performance on other 128-bit Neon platforms.  Using these functions on, for example, an A64FX would show the 2x performance difference we would expect.

    We've added looking at this to our future work list.  Thanks for raising the issue.

    Chris

Reply
  • 0 Arm Employee Badge in reply to yan.wei

    Hi.

    Thanks for confirming.  We can observe a similar lack of extra performance on other 128-bit Neon platforms.  Using these functions on, for example, an A64FX would show the 2x performance difference we would expect.

    We've added looking at this to our future work list.  Thanks for raising the issue.

    Chris

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