PMT eats CPU time? What on earth are you on about? What part of of it eats the CPU time? It can't be the context switching - every multitasking OS does that - including RISC OS, and the overhead of catching a timed interrupt and doing the context switch there can be made very lightweight indeed. In most OSes, PMT increases throughput massively.
As for BeOS: 100MHz of *what* ? Just saying 100MHz is meaningless. And considering I've worked for real-time OS companies (QNX in this case) I can say for definate that real-time PMT schedulers are much easier to write than CMT ones, and are almost always significantly quicker.
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