Parallella Community

HBE,
Why do you think Pi beats Parallella? (in technically)

The race sounds like an interesting one, and I sure might like to be able to click in a FFTw function into the Linux Ladspa/Jack "Jamin" mastering effect, that makes use of the parallella!

Maybe it should be considered that for a so long a 2^22 FFT, intermediate result accuracy may well become a problem in single precision. Also a thought might be that the NEON in the ARM hopefully is able to accelerate FFTs quite well.

T.

Hi, well I played a bit with @home things a while ago when it was new, and didn't read through the whole thread, sorry to say. If I'm not mistaken it is observed that the PI core to Zinq core improvement is only 1:1.3 ?! That I hope is due to not great compiled and /or optimized software, and without NEON, because NEON should make quite a difference I would think ?

Well, there are (for those who know a bit about the Xilinx or other brand programmable logic) IP "blocks" for the FPGA too, which compute FFTs, usually not too many bits, but the FPGA structure and the DSP mul/add power should make a difference too.

It may just boil down to which savvy programmer+ architecture buff sees the time and effect as worth while to squeeze some real juice out of the modern processors architectures!

T.

Well, it surprises me the NEON speedup is so low for fftw, considering it has 16 units, I'd expect good bandwidth to the data registers, I d hope for more speedup, but maybe that isn't realistic. I couldn't quickly find a FLOPS rating for the NEON and non-NEON ARM cores, just that it appears the Zinq ARM does have double precision NEON.

T.

It appears that our good OS friends at FFMPEG achieve more realistic speedup on NEON, I didn't dig through the whole deeply, but maybe this is interesting:



T.