So, I'm looking over /proc/cpuinfo and have a question... I've read that "siblings" refers to hyperthreading, but that seems odd considering the contents of cpuinfo. Here's a part:
model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
That almost seems to say that the CPU is a quad-core Xeon (which is correct) as well as being hyperthreaded-- each core having 4 hyperthreads. That seems wrong, though. It seems more likely that it's saying that the CPU has 4 cores and 4 hyperthreads total-- that is, depending on how one looks at it, one hyperthread per core, or, alternatively, 4 cores and no hyperthreading. Four hyperthreads per core would instead be:
siblings : 4
cpu cores : 16
Am I understanding this correctly? For that matter, is there a definitive publication about this? I've looked for it, and will continue, but no luck so far...