Re: [Help-gsl] OpenMP and GSL ?

[Jochen Küpper]

Hi Maxime,

> I would like to know if there is any plan in adding OpenMP support  
> to GSL ?

I had looked into this myself before with limited success.
Most importantly, however, I just didn't find time to get serious  
about it...

> OpenMP is the easiest way of parallelizing any code and require  
> almost no work. I have myself modified the Runge-Kutta-Felhberg  
> (4,5) algorithm to take profit of my Core 2 Duo CPU. In the attached  
> file, I simply added a couple of #pragma that tells the compiler to  
> split the loop in many threads. If these pragma are not understood,  
> it does not break the compilation. If they are, you can get a  
> speedup that is close to the number of CPUs you have in many cases.

What speed-up (in wall time) are you really seeing from these  
modifications?
How complex/expensive is your function evaluation?

> I don't know if you guys use unit testing to test GSL, but if you  
> do, adding OpenMP support could be very easy (since I believe that  
> whatever change you make to a code must be tested against unit tests).

Greetings,
Jochen
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