extern uns sorter_min_multiway_bits, sorter_max_multiway_bits;
extern uns sorter_threads, sorter_thread_threshold, sorter_thread_chunk;
extern uns sorter_radix_threshold;
extern uns sorter_min_multiway_bits, sorter_max_multiway_bits;
extern uns sorter_threads, sorter_thread_threshold, sorter_thread_chunk;
extern uns sorter_radix_threshold;