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→Sezar:
As you can see, most the program's time is spent in the ordres() subroutine and zfunr() subroutine; both are localed in the fortran portion of the program (there is a c portion as well).
Furthermore, this program is already parallelized using openmpOpenMP; which means it may be farther parallelized using cuda technology.
In these two subroutines (specially in orders()) there are a lot of nested loops, if statements, goto's, and even some sore of a search algorithm (in orders() only) that I'm certain it could be notably improved using cuda technology.
The project is on github [https://github.com/rogeliotomas/Drive_GPU here]
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