I believe it's actually simultaneous, instructions from 2 different processes
can run in the same cycle against 2 different register files.
Other chips have vertical multithreading where only 1 process runs in any
given cycle.
Peter St. John wrote:
Just for a clarification (for those of us who are hardware deficient),
hyperthreading (the Intel mechanism) isn't actually simultaneous, correct? I
had assumed so but I appear to be confused about it. Hyperthreading keeps a
thread ready to take advantage of stalls in a preceeding thread, but doesn't
ever actually perform a second instruction in one click tick, correct? One
might think that there are so many pathways on a modern chip that collisions
could be managed among several simultaneous threads.
Thanks,
Peter
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