Re: [Discuss-gnuradio] ffast-math

[Albin Stigö]

In my experience VOLK runs about 10% faster on Raspberry Pi 4 with
-ffast-math, depending on the flowgraph you might get more. Three
kernels had some minor problems with precision, but I think they can
be fixed so all will pass... The fun thing about these embedded
platforms is that the possibilities for optimizations are almost
endless!

On a side note, which fork of dump1090 should I run? There seems to be so many!


--Albin

On Tue, Sep 3, 2019 at 6:18 PM Chris Kuethe <address@hidden> wrote:
>
> Yep, on some processors with some workloads it really makes a huge 
> difference. As others have commented, there may be significant trade-offs 
> with regard to numerical behaviro.
>
> Some of my observations:
> dump1090 loses accuracy below the 7th digit when calculating precision, but 
> consumes 10% less power on the device under test
> rtl_433 runs about 35% faster
> and acarsdec runs over 400% faster.
>
>
> On Sun, Sep 1, 2019, 07:11 Albin Stigö <address@hidden> wrote:
>>
>> Anyone has experience with the real world impact of using gcc -ffast-math 
>> with SDR in general, and GNURadio/Volk in particular?
>>
>>
>> --Albin SM6WJM
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