[Fluxus] vector operations performance

[Dave Griffiths]

Hi Gabor

On Sun, 2009-05-17 at 23:10 -0400, gabor papp wrote:
> >> As long as it doesn't impact performance, please feel free to improve
> i am testing the performance of vector operators and comparing them to
> simple macros that can handle every vector sizes. i attached a vadd
> test. it turns out that it is even a bit faster than the c++ version,
> probably due to the scheme->c conversion overhead.
> 
> adding 2 random vectors:
> vadd: 0.00564 0.00783 0.0007
> vaddx: 0.00401 0.00724 0.00056
> 
> adding 3 random vectors:
> vadd: 0.00608 0.01074 0.00064
> vaddx: 0.00489 0.00951 0.00108
>
> the results are calculated by adding the vectors 100000 times and
> calculating the average time needed to execute the instructions. vadd is
> the current vector addition fluxus uses, vaddx is the macro attached.
> the three numbers are: the number of milliseconds of CPU time required
> to obtain this result, the number of "real" milliseconds required for
> the result, and the number of milliseconds of CPU time spent on garbage
> collection.
> 
> what do you think? can we change the vector operations to more flexible
> scheme versions or am i overlooking something?

This is great news, I tried this a few years ago and the C++ versions
were faster - which I was surprised at. I say we should switch to these
scheme versions now.

cheers,

dave