<r>what platform? Thrust (CUDA) has a merge sort, or you could check this out -> <URL url="https://wiki.cc.gatech.edu/multicore/index.php/Parallelizing_Sort_Algorithms"><LINK_TEXT text="https://wiki.cc.gatech.edu/multicore/in ... Algorithms">https://wiki.cc.gatech.edu/multicore/index.php/Parallelizi...