Function round_to_multiple

less_slow.cpp:564–566

#include <omp.h> // `omp_get_max_threads`

std::size_t round_to_multiple(std::size_t value, std::size_t multiple) {
    return ((value + multiple - 1) / multiple) * multiple;
}

static void sorting_with_openmp(bm::State &state) {