[gambit-list] Some floating-point benchmarks

Adam adam.mlmb at gmail.com
Tue Apr 17 00:37:18 EDT 2018


Wait, what's the context here - which Gambit primitives/features are
implemented in terms of these floating point logics you talk about here?

Thanks!


2018-04-17 6:51 GMT+08:00 Bradley Lucier <lucier at math.purdue.edu>:

> On 04/16/2018 09:28 AM, Marc Feeley wrote:
> >On Apr 13, 2018, at 3:15 PM, Bradley Lucier <lucier at math.purdue.edu>
> wrote > Bottom line: this page
> >
> > https://asteroidsathome.net/boinc/cpu_list.php
> >
> > claims that this cpu gets 4.42 Whetstone GFLOPS per core, and we get a
> maximum of 5.24 GFLOPS on this fft code.  Not bad.
>
> The code miscalculated the number of operations, the most we get with
> strict aliasing and allowing fused-multiply-add is 4.62 GFLOPS:
>
> heine:~/Downloads> gsc -cc-options "-fstrict-aliasing -O3 -save-temps"
> -exe fft
> heine:~/Downloads> ./fft
> <stuff removed>
> n = 17; time = .0048208906249999905; GFLOPS = 4.622020853252617; error =
> 1.9179232434271595e-8
>
> and not allowing fused multiply add gives 4.18 GFLOPS:
>
> heine:~/Downloads> gsc -cc-options "-fstrict-aliasing -O3 -save-temps
> -mno-fma" -exe fft
> heine:~/Downloads> ./fft
> <stuff removed>
> n = 17; time = .00532633984375; GFLOPS = 4.183408804856173; error =
> 1.895030528746498e-8
>
> I'll look into adding something to the Gambit benchmark suite.
>
> Brad
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