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Originally Posted by scastle
That software has to be designed to efficiently run with multiple threads to really benefit. For instance, if you run premiere 5 (which is not optimised for multiple processors) on a MP (or presumably, Dual core) mavhine, it will only use one CPU. If you run Premiere 6 on the same machine, you will get a 70% speed increase, as Premiere 6 is optimised for multiprocessor use. Hyperthreading gives Premiere 6 a similar, but lesser boost.
Not sure about now, but I do remember reading that a while back (when Quake 3 was released), very few games were optimised for MP use.
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It's not generally the software that gets optimised for MP (though it is possible), it's the OS. A software engineer will design their program utilising multiple threads/processes (Posix, Java threads etc), it is then the OS that decides how and when these threads/processes will run (the Scheduler). Therefore, as long as the OS is built to take into account MP, any threaded program should automatically take advantage of an extra processor.