[Beowulf] Opinions of Hyper-threading?

[Peter St. John]

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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