Multi-threading in sort(or core-utils)

[rilium]

Hello
Few minutes ago i used sort -u for sorting big file(236 Mb). I have 2 core 
cpu(core 2 duo), but i found that sort use only one cpu(work in one thread). I 
think it is good idea to make option(or by default) for sorting in threads to 
increase performance on systems that might execute more than one thread in 
parallel.
   Klimentov Konstantin.