function minimization on small arrays - is it worth it ? fitting data to a function for small array

Accelerated Computing CUDA CUDA Programming and Performance
1

It seems that all this CUDA thing makes sense only for really large arrays of data.

Any idea of a approximate minimum number of elements for which CUDA would start to make sense ?

Say, a fit to a circle for 20 points ?

Or a Gaussian fit for 5 points ?

(for example, Core 2 CPU vs 9600GT GPU)

2

Sure it’s worth it, if you have to fit 2000 circles, or 10000 sets of Gaussans at once ;)

Christian

3

The best rule of thumb I’m aware of is the thread count. If you can launch at least several thousand threads on the device, it is usually worth it.

4

Thank you,
you confirmed my disappointment :(