Calculate the histogram with OpenMP

Question

I want to parallelize this code getting the best performance. \"histogram\" stores number of appareances of a certain colour (there are 10 different colours, so the size of

Answer 1

With OpenMP 4.5, you can simply use a array reduction in C:

int histogram[BINS] = {0};
#pragma omp parallel for reduction(+:hist)
for(i=0; i