extern uns sorter_debug, sorter_min_radix_bits, sorter_max_radix_bits, sorter_add_radix_bits;
extern uns sorter_min_multiway_bits, sorter_max_multiway_bits;
extern uns sorter_threads, sorter_thread_threshold, sorter_thread_chunk;
extern uns sorter_debug, sorter_min_radix_bits, sorter_max_radix_bits, sorter_add_radix_bits;
extern uns sorter_min_multiway_bits, sorter_max_multiway_bits;
extern uns sorter_threads, sorter_thread_threshold, sorter_thread_chunk;